Coherent control of macroscopic quantum states in a single-Cooper-pair box

Abstract

A small superconducting electrode (a single-Cooper-pair box) connected to a reservoir via a Josephson junction constitutes an artificial two-level system, in which two charge states that differ by 2e are coupled by tunneling of Cooper pairs. Despite its macroscopic nature involving a large number of electrons, the two-level system shows coherent superposition of the two charge states, and has been suggested as a candidate for a qubit, i.e. a basic component of a quantum computer. Here we report on time-domain observation of the coherent quantum-state evolution in the two-level system by applying a short voltage pulse that modifies the energies of the two levels nonadiabatically to control the coherent evolution. The resulting state was probed by a tunneling current through an additional probe junction. Our results demonstrate coherent operation and measurement of a quantum state of a single two-level system, i.e. a qubit, in a solid-state electronic device.

4 pages, 4 figures; to be published in Nature

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• Equilibrium and time-dependent Josephson current in one-dimensional superconducting junctions
• Quantum Statistics and Entanglement of Two Electromagnetic Field Modes Coupled via a Mesoscopic SQUID Ring
• Ground State Quantum Computation
• Simple quantum feedback of a solid-state qubit
• Spin-boson dynamics beyond conventional perturbation theories
• Electromagnetic Nanonetworks Beyond 6G: From Wearable and Implantable Networks to On-chip and Quantum Communication
• Long-lived, radiation-suppressed superconducting quantum bit in a planar geometry
• Axion search with quantum nondemolition detection of magnons
• Decoherence times of universal two-qubit gates in the presence of broad-band noise
• Charge Qubit-Atom Hybrid
• Pulse calibration and non-adiabatic control of solid-state artificial atoms
• Controls of a superconducting quantum parametron under a strong pump field
• The quantum computational speed of a single Cooper Pair box
• Quantum driving and work
• A Cooper-Pair Box Coupled to Two Resonators: An Architecture for a Quantum Refrigerator
• Incomplete pure dephasing of N-qubit entangled W states
• Superconducting LaAlO3/SrTiO3 Nanowires
• Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large junction
• Quantum computing with spin qubits in semiconductor structures
• Free Evolution of Superposition States in a Single Cooper Pair Box
• System-Environment Correlations in Qubit Initialization and Control
• Cyclic solid-state quantum battery: Thermodynamic characterization and quantum hardware simulation
• Nonadiabatic Transition Probabilities in the Presence of Strong Dissipation at an Avoided Level Crossing Point
• Ohmic and step noise from a single trapping center hybridized with a Fermi sea
• Optimal control for fast and high-fidelity quantum gates in coupled superconducting flux qubits
• Realizing and manipulating space-time inversion symmetric topological semimetal bands with superconducting quantum circuits
• Quantum superpositions of clockwise and counterclockwise supercurrent states in the dynamics of a rf-SQUID exposed to a quantized electromagnetic field
• Macroscopic entanglement in Josephson nanocircuits
• Superconducting qubit network with controllable nearest neighbor coupling
• Efficient evaluation of decoherence rates in complex Josephson circuits
• Quantum measurement in the charge representation
• Decoherence of a two-qubit system with a variable bath coupling operator
• Tuned transition from quantum to classical for macroscopic quantum states
• Collective modes in the fluxonium qubit
• Performance of a Superconducting Quantum Battery
• Asymptotically noise decoupling for Markovian open quantum systems
• Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
• Subspace Confinement: How good is your qubit?
• Consistent Quantization of Nearly Singular Superconducting Circuits
• Coherent superconducting qubits from a subtractive junction fabrication process
• Noise and Measurement Efficiency of a Partially Coherent Mesoscopic Detector
• Fast Non-Adiabatic Two Qubit Gates for the Kane Quantum Computer
• Entanglement creation in circuit QED via Landau-Zener sweeps
• Decoherence in rf SQUID Qubits
• Reduced Visibility of Rabi Oscillations in Superconducting Qubits
• Revisiting the Mapping of Quantum Circuits: Entering the Multi-Core Era
• Cool for Cats
• Fabrication of mesoscopic Nb wires using conventional e-beam lithographic techniques
• Quantum computation with quasiparticles of the Fractional Quantum Hall Effect
• Full frequency voltage noise spectral density of a single electron transistor
• Superconducting crossed correlations in ferromagnets: implications for thermodynamics and quantum transport
• Entangling Pairs of Nano-Cantilevers, Cooper-Pair Boxes and Mesoscopic Teleportation
• Quantumness Witnesses
• Optically Driven Qubits in Artificial Molecules
• Theory of measurement crosstalk in superconducting phase qubits
• Symmetries and collective excitations in large superconducting circuits
• Superconducting qubit manipulated by fast pulses: experimental observation of distinct decoherence regimes
• Detection of qubit-oscillator entanglement in nanoelectromechanical systems
• Dispersive Manipulation of Paired Superconducting Qubits
• Towards an Experimental Test of Gravity-induced Quantum State Reduction
• Tunable coupling between three qubits as a building block for a superconducting quantum computer
• Possible use of a Cooper-pair box for low-dose electron microscopy
• Coherent control of a flux qubit by phase-shifted resonant microwave pulses
• Topological quantization by controlled paths: application to Cooper pairs pumps
• Quantum computation with cat qubits
• Quantum state detection of a superconducting flux qubit using a DC-SQUID in the inductive mode
• Intrinsic leakage of the Josephson flux qubit and breakdown of the two-level approximation for strong driving
• Effects of low-frequency noise cross-correlations in coupled superconducting qubits
• Magnetic ordered structure dependence of magnetic refrigeration efficiency
• Method for direct observation of coherent quantum oscillations in a superconducting phase qubit
• Why Study Noise due to Two Level Systems: A Suggestion for Experimentalists
• Probing a composite spin-boson environment
• Universal Parity Quantum Computing
• Rabi oscillations of a qubit coupled to a two-level system
• Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System
• Possible realization of Josephson charge qubits in two coupled Bose-Einstein condensates
• Measurement of coherent charge transfer in an adiabatic Cooper pair pump
• Dynamical instabilities of a resonator driven by a superconducting single-electron transistor
• Spectrum and Coherence Properties of the Current-Mirror Qubit
• Ground State Entanglement Energetics
• Multi-mode architectures for noise-resilient superconducting qubits
• Decoherence of charge qubit coupled to interacting background charges
• Quantum tomography for solid state qubits
• Time of arrival through interacting environments: Tunneling processes
• Dynamics of encrypted information in the presence of imperfect operations
• Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity
• Spectroscopy of a driven solid-state qubit coupled to a structured environment
• Decoherence due to discrete noise in Josephson qubits
• Coherent control theory and experiment of optical phonons in diamond
• Comparison among Various Expressions of Complex Admittance for Quantum System in Contact with Heat Reservoir
• Influence of Stark-shift on quantum coherence and non-classical correlations for two two-level atoms interacting with a single-mode cavity field
• Non-additivity of decoherence rates in superconducting qubits
• Alternating Bias Assisted Annealing of Amorphous Oxide Tunnel Junctions
• On the Exponential of Matrices in su(4)
• Estimating phase parameters of a three-level system interacting with two classical monochromatic fields in simultaneous and individual metrological strategies
• Coupled superconducting spin qubits with spin-orbit interaction
• Rapid state purification protocols for a Cooper pair box
• Entanglement-assisted electron microscopy based on a flux qubit
• Non-Markoffian effects of a simple nonlinear bath
• Dissipative dynamics in a quantum bistable system: Crossover from weak to strong damping
• Hybridized solid-state qubit in the charge-flux regime
• Classification of macroscopic quantum effects
• Fast readout of a single Cooper-pair box using its quantum capacitance
• Bloch inductance in small-capacitance Josephson junctions
• Characterization of decohering quantum systems: Machine learning approach
• Full electrostatic control of quantum interference in an extended trenched Josephson junction
• Superconducting Qubit-Resonator-Atom Hybrid System
• Circuit with small-capacitance high-quality Nb Josephson junctions
• Probing hundreds of individual quantum defects in polycrystalline and amorphous alumina
• Spectral Analysis and Identification of Noises in Quantum Systems
• Deep-well ultrafast manipulation of a SQUID flux qubit
• Retrieving qubit information despite decoherence
• Full control of qubit rotations in a voltage-biased superconducting flux qubit
• Resilience of the quantum Rabi model in circuit QED
• Dephasing of qubits by transverse low-frequency noise
• Josephson charge-phase qubit with radio frequency readout: coupling and decoherence
• Implementing Shor's algorithm on Josephson Charge Qubits
• An asymptotical von-Neumann measurement strategy for solid-state qubits
• Nonlinearity and Parametric Amplification of Superconducting Nanowire Resonators in Magnetic Field
• Qubit decoherence by low-frequency noise
• Density matrix renormalization group study of a quantum impurity model with Landau-Zener time-dependent Hamiltonian
• Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit
• Superconducting tetrahedral quantum bits
• Dielectric losses in multi-layer Josephson junction qubits
• Optomechanical measurement of a millimeter-sized mechanical oscillator near the quantum limit
• A Practical Introduction to Benchmarking and Characterization of Quantum Computers
• Mechanical Cooper pair transportation as a source of long distance superconducting phase coherence
• Fluctuations of the Josephson current and electron-electron interactions in superconducting weak links
• A superconducting qubit with noise-insensitive plasmon levels and decay-protected fluxon states
• Low-bandwidth control scheme for an oscillator stabilized Josephson qubit
• Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits
• Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor
• Coupling Josephson qubits via a current-biased information bus
• Effective Hamiltonians for interacting superconducting qubits -- local basis reduction and the Schrieffer-Wolff transformation
• Theory for the optimal control of time-averaged quantities in open quantum systems
• Vortex qubit based on an annular Josephson junction containing a microshort
• Charge and Spin Effects in Mesoscopic Josephson Junctions
• Superconducting flux qubit with ferromagnetic Josephson $\pi$-junction operating at zero magnetic field
• Demonstration of Deutsch's Algorithm on a Stable Linear-Optical Quantum Computer
• Chaotic dynamics in superconducting nanocircuits
• Right-sizing fluxonium against charge noise
• Spontaneous Symmetry Breaking and Decoherence in Superconductors
• Macroscopic non-classical state preparation via post-selection
• Dynamics and thermalization of the nuclear spin bath in the single-molecule magnet Mn12-ac: test for the theory of spin tunneling
• Multi-Terminal Superconducting Phase Qubit
• Switchable coupling between charge and flux qubits
• Quantum-Hall Quantum-Bits
• Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong-coupling regime
• Testing Bell's inequality and measuring the entanglement using superconducting nanocircuits
• Continuous quantum non-demolition measurement of Fock states of a nanoresonator using feedback-controlled circuit QED
• Robust stationary entanglement of two coupled qubits in independent environments
• Crossover of phase qubit dynamics in presence of negative-result weak measurement
• Two-qubit gate using conditional driving for highly detuned Kerr-nonlinear parametric oscillators
• Optimization of the resonator-induced phase gate for superconducting qubits
• Spectral properties on a circle with a singularity
• Tuning from Frustrated Magnetism to Superconductivity in Quasi-One-Dimensional KCr${}_3$As${}_3$ Through Hydrogen Doping
• High Fidelity Quantum Gates in the Presence of Dispersion
• Detection of a persistent-current qubit by resonant activation
• Crossovers in spin-boson and central spin models
• Metallic coplanar resonators optimized for low-temperature measurements
• Guidance and Control in a Josephson Charge Qubit
• Single Cooper-pair pumping in the adiabatic limit and beyond
• Quasienergies and dynamics of superconducting qubit in time-modulated field
• Quantum measurement as driven phase transition: An exactly solvable model
• Superconducting circuit simulator of Bose-Hubbard model with a flat band
• Mimicking Time Evolution within a Quantum Ground State: Ground-State Quantum Computation, Cloning, and Teleportation
• Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid
• A view on the open STIRAP problem
• Spatial, spin, and charge symmetry projections for a Fermi-Hubbard model on a quantum computer
• Josephson effect between superconducting nanograins with discrete energy levels
• Dynamical 1/N approach to time-dependent currents through quantum dots
• Quantum-efficient charge detection using a single-electron transistor
• Inelastic tunneling in a double quantum dot coupled to a bosonic environment
• Quantum transport of double quantum dots coupled to an oscillator in arbitrary strong coupling regime
• Designing High-Fidelity Zeno Gates for Dissipative Cat Qubits
• Geometrical description and Faddeev-Jackiw quantization of electrical networks
• Enhanced-Fidelity Ultrafast Geometric Quantum Computation Using Strong Classical Drives
• Geometric Quantum Computation on Solid-State Qubits
• Effects of surface treatments on flux tunable transmon qubits
• Probing the symmetry breaking of a light--matter system by an ancillary qubit
• Effects of lasing in a one-dimensional quantum metamaterial
• Designing Kerr interactions using multiple superconducting qubit types in a single circuit
• Nanosecond quantum state detection in a current biased dc SQUID
• Characterizing the rate and coherence of single-electron tunneling between two dangling bonds on the surface of silicon
• Dirac Fermion Quantum Hall Antidot in Graphene
• Quantum behavior of the dc SQUID phase qubit
• Long-Range $ZZ$ Interaction via Resonator-Induced Phase in Superconducting Qubits
• Spin-echo entanglement protection from random telegraph noise
• Active suppression of dephasing in Josephson-junction qubits
• Modeling low- and high-frequency noise in transmon qubits with resource-efficient measurement
• Single-junction quantum-circuit refrigerator
• Controlled generation of genuine multipartite entanglement in Floquet Ising spin models
• Designing robust gate implementations for quantum information processing
• Quantum Computer Using Coupled Quantum Dot Molecules
• Spin Decoherence from Hamiltonian dynamics in Quantum Dots
• Decoherence dynamics of a qubit coupled to a quantum two-level system
• Quantum Zeno stabilization in weak continuous measurement of two qubits
• Entangled Dynamics in Macroscopic Quantum Tunneling of Bose-Einstein Condensates
• Optimal scheduling in probabilistic imaginary-time evolution on a quantum computer
• Synthesis of maximally entangled mixed states and disentanglement in coupled Josephson charge qubits
• Suppression of the critical current of a balanced SQUID
• Selective Amplification of a Quantum State
• Narrow band microwave radiation from a biased single-Cooper-pair transistor
• A ballistic quantum ring Josephson interferometer
• Electronic spin-spin decoherence contribution in molecular qubits by quantum unitary spin dynamics
• Gutzwiller wave function on a quantum computer using a discrete Hubbard-Stratonovich transformation
• Molecular Ensemble Based Remote Quantum Storage for Charge Qubit via Quasi-Dark State
• Electron transport through a quantum dot assisted by cavity photons
• Inter-valley interactions in Si quantum dots
• Stabilizing Rabi Oscillation of a Charge Qubit via Atomic Clock Technique
• Testing the quantum superposition principle in the frequency domain
• Recent Developments in Quantum-Circuit Refrigeration
• Nanomechanical-resonator-assisted induced transparency in a Cooper-pair-box system
• Microwave Spectroscopy of a Cooper-Pair Transistor Coupled to a Lumped-Element Resonator
• Interconnect Fabrics for Multi-Core Quantum Processors: A Context Analysis
• Reverse quantum state engineering using electronic feedback loops
• Charge shelving and bias spectroscopy for the readout of a charge-qubit on the basis of superposition states
• Controlled phase gate for solid-state charge qubits
• Quantum interface between photonic and superconducting qubits
• Geometric phase of a two-level system in a dissipative environment
• Decoherence in circuits of small Josephson junctions
• Charge Transport Processes in a Superconducting Single-Electron Transistor Coupled to a Microstrip Transmission Line
• Heat transport through a two-level system embedded between two harmonic resonators
• Enhancing quantum transduction via long-range waveguide mediated interactions between quantum emitters
• Perturbation Theory for Quantum Computation with Large Number of Qubits
• Superconducting phase qubit based on the Josephson oscillator with strong anharmonicity
• Asymptotic Expressions for Charge Matrix Elements of the Fluxonium Circuit
• Phase sensitive amplification in a superconducting stripline resonator integrated with a dc-SQUID
• Steady-state squeezing transfer in hybrid optomechanics
• A theoretical investigation into the microwave spectroscopy of a phosphorus-donor charge-qubit in silicon: Coherent control in the Si:P quantum computer architecture
• Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters
• Time-optimal performance of Josephson charge qubits: A process tomography approach
• Quantum phase slips in a resonant Josephson junction
• Exploring Quantum Annealing Architectures: A Spin Glass Perspective
• Fabrication of Deep-Sub-Micrometer NbN/AlN/NbN Epitaxial Junctions on a Si Substrate
• Control of a spin qubit in a lateral GaAs quantum dot based on symmetry of gating potential
• Building a bigger Hilbert space for superconducting devices, one Bloch state at a time
• Two-photon absorption in a two-level system enabled by noise
• Single-electron transistors in electromagnetic environments
• Experimental Realization of Self-Contained Quantum Refrigeration
• Multi-mode superconducting circuits for realizing strongly coupled multi-qubit processor units
• Spin swap gate in the presence of qubit inhomogeneity in a double quantum dot
• Multiplexing Superconducting Qubit Circuit for Single Microwave Photon Generation
• Bias-modulated dynamics of a strongly driven two-level system
• Quantum interface between a transmon qubit and spins of nitrogen-vacancy centers
• Demonstration of quantum permutation algorithm with a single photon ququart
• Flux Qubit in Charge-Phase Regime
• Effect of control procedures on the evolution of entanglement in open quantum systems
• Quantum state engineering with flux-biased Josephson phase qubits by Stark-chirped rapid adiabatic passages
• Vibronic spectroscopy of an artificial molecule
• Analysis of measurement errors for a superconducting phase qubit
• Resonant effects in the strongly driven phase-biased Cooper-pair box
• Pseudo-Rabi oscillations in superconducting flux qubits in the classical regime
• Rapid optimization of working parameters of microwave-driven multi-level qubits for minimal gate leakage
• Suspended single-electron transistors: fabrication and measurement
• Quantum detectors for the third cumulant of current fluctuations
• Rabi Oscillations in Systems with Small Anharmonicity
• Entanglement of superconducting charge qubits by homodyne measurement
• Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit II: Implementation
• Detection of Geometric Phases in Flux Qubits with Coherent Pulses
• Local and non-local two-electron tunneling processes in a Cooper pair splitter
• Decoherence Effects on Superpositions of Chiral States in a Chiral Molecule
• Controllable Coupling in Phase-Coupled Flux Qubits
• Gravitational eigenstates in weak gravity I: dipole decay rates of charged particles
• Correlated quantum measurement of a solid-state qubit
• Pseudospin Quantum Computation in Semiconductor Nanostructures
• Universal distributed quantum computing on superconducting qutrits with dark photons
• Correcting low-frequency noise with continuous measurement
• Quasiparticle tunneling and 1/f charge noise in ultrastrongly coupled superconducting qubit and resonator
• On demand entanglement in double quantum dots via coherent carrier scattering
• Tunable Flux Qubit manipulated by fast pulses: operating requirements, dissipation and decoherence
• Qubit systems subject to unbalanced random telegraph noise: quantum correlations, non-Markovianity and teleportation
• Entanglement in Resonance Fluorescence
• Superconducting qubit circuit emulation of a vector spin-1/2
• Readout for Phase Qubits without Josephson Junctions
• Modulation of dephasing due to a spin-boson environment
• Effect of bath temperature on the quantum decoherence
• Experimentally Realizable C-NOT Gate in a Flux Qubit/Resonator System
• Decoherence in a Cooper pair shuttle
• Protected cat states from kinetic driving of a boson gas
• Identification of Coulomb blockade and macroscopic quantum tunneling by noise
• Josephson nanocircuit in the presence of linear quantum noise
• Junctionless Cooper pair transistor
• Double dot chain as a macroscopic quantum bit
• Errors due to Finite Rise/fall Times of Pulses in Superconducting Charge Qubits
• Double symmetry breaking and 2D quantum phase diagram in spin-boson systems
• Quantum properties of a strongly driven Josephson junction
• Microwave spectroscopy on a double quantum dot with an on-chip Josephson oscillator
• Mesoscopic threshold detectors: Telegraphing the size of a fluctuation
• Current-Phase Relation and Josephson Inductance of Superconducting Cooper Pair Transistor
• Charge-Kondo Effect in Mesoscopic Superconductors Coupled to Normal Metals
• Hybrid Qubit gates in circuit QED: A scheme for quantum bit encoding and information processing
• Spin-boson dynamics: A unified approach from weak to strong coupling
• Structurally stable subharmonic regime of a driven quantum Josephson circuit
• Quantum phase estimation algorithms with delays: effects of dynamical phases
• Normal modes of a superconducting transmission-line resonator with embedded lumped element circuit components
• Meissner transmon qubit - architecture and characterization
• Assessment of weak-coupling approximations on a driven two-level system under dissipation
• Simulating Quantum Dissipation in Many-Body Systems
• Majorana signatures in charge transport through a topological superconducting double-island system
• Short-time decoherence of Josephson charge qubit nonlinearly coupling with its environment
• Real-time simulation of flux qubits used for quantum annealing
• An expectation value expansion of Hermitian operators in a discrete Hilbert space
• Route-Forcing: Scalable Quantum Circuit Mapping for Scalable Quantum Computing Architectures
• Turnstile behaviour of the Cooper-pair pump
• Phase dependence of localization in the driven two-level model
• Circuit Partitioning for Multi-Core Quantum Architectures with Deep Reinforcement Learning
• Non-gaussian Noise in Quantum Spin Glasses and Interacting Two-level Systems
• Error rate reduction of single-qubit gates via noise-aware decomposition into native gates
• Logical measurement-based quantum computation in circuit-QED
• Quantum Dynamics in Non-equilibrium Strongly Correlated Environments
• Creation of macroscopic quantum superposition states by a measurement
• Probing internal bath dynamics by a Rabi oscillator-based detector
• All-optical measurement-device-free feedforward enabling ultra-fast quantum information processing
• Superconducting tunable flux qubit with direct readout scheme
• Quasiparticle poisoning and Josephson current fluctuations induced by Kondo impurities
• The Influence of Superpositional Wave Function Oscillations on Shor's Quantum Algorithm
• On the capability of a class of quantum sensors
• Phase readout of a charge qubit capacitively coupled to an open double quantum dot
• Theory of a double-dot charge detector
• Microwave Scattering in the Subohmic Spin-Boson Systems of Superconducting Circuits
• A tunable rf SQUID manipulated as flux and phase qubit
• Universal quantum state preparation via revised greedy algorithm
• SU(2) Symmetry of Coherent Photons and Application to Poincaré Rotator
• Encoding a logical qubit into physical qubits
• Loss of quantum coherence due to non-stationary glass fluctuations
• DC measurements of macroscopic quantum levels in a superconducting qubit structure with a time-ordered meter
• Structured environments in solid state systems: crossover from Gaussian to non-Gaussian behavior
• Detection of temporal fluctuation in superconducting qubits for quantum error mitigation
• Long-lived resonances at mirrors
• Landau-Zener Transitions and Rabi Oscillations in a Cooper-Pair Box: Beyond Two-Level Models
• Generation of cluster states with Josephson charge qubits
• Charge Oscillations in Superconducting Nanodevices Coupled to External Environments
• The Mesoscopic Kondo Box: A Mean-Field Approach
• Phenomenological noise model for superconducting qubits: two-state fluctuators and 1=f noise
• Broadband noise decoherence in solid-state complex architectures
• Nonexponential Relaxation of Magnetization at the Resonant Tunneling Point under a Fluctuating Random Noise
• Enhancement of Geometric Phase by Frustration of Decoherence: A Parrondo like Effect
• Double resonance response of a superconducting quantum metamaterial: manifestation of non-classical states of photons
• High-Order Qubit Dephasing at Sweet Spots by Non-Gaussian Fluctuators: Symmetry Breaking and Floquet Protection
• Radiation comb generation with extended Josephson junctions
• Universal quantum gates, artificial neurons and pattern recognition simulated by \textit{LC} resonators
• Decoherence induced by electron accumulation in quantum measurement of charge qubits
• Low-temperature environments for quantum computation and quantum simulation
• Conversion of Thermal Equilibrium States into Superpositions of Macroscopically Distinct States
• Density profiles of two-component Bose-Einstein condensates interacting with a Laguerre-Gaussian Beam
• Design of a Cooper pair box electrometer for application to solid-state and astroparticle physics
• Charge sensitivity of the Inductive Single-Electron Transistor
• Open Ising Model Perturbed by Classical Colored Noises
• Unifying Floquet theory of longitudinal and dispersive readout
• Visualization of superposition of macroscopically distinct states
• Supercurrent transport through 1$e$-periodic full-shell Coulomb islands
• Entanglement of distant flux qubits mediated by non-classical electromagnetic field
• Quantum Error Mitigation via Quantum-Noise-Effect Circuit Groups
• Chiral SQUID-metamaterial waveguide for circuit-QED
• Dissipative dynamics of a qubit coupled to a nonlinear oscillator
• Mesoscopic Shelving Readout of Superconducting Qubits in Circuit QED
• Functional Renormalization Group Approach to Circuit Quantum Electrodynamics
• Quantum Logic Processor: A Mach Zehnder Interferometer based Approach
• Generation of 3-Dimensional graph state with Josephson charge qubits
• Simple quantum model for light depolarization
• Adiabatic evolution of a coupled-qubit Hamiltonian
• Photon-pair blockade in a Josephson-photonics circuit with two nondegenerate microwave resonators
• Sensitivity to parameters of STIRAP in a Cooper-Pair Box
• Non-Markovian dynamics and noise characteristics in continuous measurement of a solid-state charge qubit
• Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process
• Short-time decoherence of Josephson charge qubits
• Beyond spontaneously broken symmetry in Bose-Einstein condensates
• Merging diabolical points of a superconducting circuit
• Schrodinger cat animated on a quantum computer
• Landau-Zener-Stückelberg Spectroscopy of a Superconducting Flux Qubit
• Decoherence without dissipation?
• Simulation of supersymmetric quantum mechanics in a Cooper-pair box shunted by a Josephson rhombus
• 1/f noise in quantum nanoscience
• A nonlinear mechanism of charge qubit decoherence in a lossy cavity: the quasi normal mode approach
• Dephasing in a crystal-phase defined double quantum dot charge qubit strongly coupled to a high-impedance resonator
• Quantum light depolarization: the phase-space perspective
• Tuning of non-paraxial effects of the Laguerre-Gaussian beam interacting with the two-component Bose-Einstein condensates
• Radio frequency pulsed-gate charge spectroscopy on coupled quantum dots
• Skew Information for a single Cooper Pair Box interacts with a single cavity Mode
• Reduced dynamics with renormalization in solid-state charge qubit measurement
• Mechanical Lamb-shift analogue for the Cooper-pair box
• An interleaved sampling scheme for the characterization of single qubit dynamics
• Loading Bose condensed atoms into the ground state of an optical lattice
• Auxiliary-level-assisted operations with charge qubits in semiconductors
• On-chip Integration of High-Frequency Electron Paramagnetic Resonance Spectroscopy and Hall-Effect Magnetometry
• Spatiotemporal Bloch states of a spin-orbit coupled Bose-Einstein condensate in an optical lattice
• Numerical Study of Energy Loss by a Nanomechanical Oscillator Coupled to a Cooper Pair Box
• Tunable coupling between a superconducting resonator and an artificial atom
• Quantum metrology of low frequency electromagnetic modes with frequency upconverters
• Decoherence of Josephson charge qubit
• Fluctuation Relation for Qubit-Calorimetry
• On the Preparation of Pure States in Resonant Microcavities
• Dirac formulation for universal quantum gates and Shor's integer factorization in high-frequency electric circuits
• Implementation of many-qubit Grover search with trapped ultracold ions
• Symmetrically Threaded Superconducting Quantum Interference Devices As Next Generation Kerr-cat Qubits
• Spectroscopy of a Cooper-Pair box in the Autler-Townes configuration
• Steady-state entanglement enhanced by a dissipative ancilla
• Arrays of Cooper Pair Boxes Coupled to a Superconducting Reservoir: `Superradiance' and `Revival.'
• Spectral Signatures of Non-Trivial Topology in a Superconducting Circuit
• Manifestation of additional dimensions of space-time in mesoscopic systems
• Detecting Photon-Photon Interactions in a Superconducting Circuit
• A Nonlinear Charge- and Flux-Tunable Cavity Derived from an Embedded Cooper Pair Transistor
• Charge Qubit Storage and Its Engineered Decoherence via Microwave Cavity
• Method for direct observation of coherent quantum oscillations in a superconducting phase qubit. Computer simulations
• Universal quantum computation with symmetric qubit clusters coupled to an environment
• Strongly-coupled Josephson junction array for simulation of frustrated one-dimensional spin models
• Thermal entanglement in superconducting quantum-interference-device qubits coupled to cavity field
• Pulse shape effects in qubit dynamics demonstrated on an IBM quantum computer
• Shortcuts to adiabaticity in superconducting circuits for fast multi-partite state generation
• Implementation of the Deutsch-Jozsa algorithm with Josephson charge qubits
• Floquet Analysis of Frequency Collisions
• Entanglement between charge qubit states and coherent states of nanomechanical resonator generated by AC Josephson effect
• Quantum chaos in the mesoscopic device for the Josephson flux qubit
• Quantum Down Conversion and Multipartite Entanglement via a Mesoscopic SQUID Ring
• Improving the purity of one- and two-qubit gates by AC fields
• Even-Odd Effect in Spontaneously Coherent Bilayer Quantum Hall Droplets
• Quantum instability in a dc-SQUID with strongly asymmetric dynamical parameters
• An Optimal Tunable Josephson Element for Quantum Computing
• Manifold algorithmic errors in quantum computers with static internal imperfections
• Adaptive homodyne phase discrimination and qubit measurement
• Implementation of Grover search algorithm with Josephson charge qubits
• Transfer and storage of qubits in the presence of decoherence
• Implementation of single-qubit gates via parametric modulation in the Majorana transmon
• An engineering guide to superconducting quantum circuit shielding
• Superconductivity in hyperdoped Ge by molecular beam epitaxy
• Effects of spin-orbit coupling and in-plane Zeeman fields on the critical current in two-dimensional hole gas SNS junctions
• Experimenting quantum phenomena on NISQ computers using high level quantum programming
• The superconducting circuit companion -- an introduction with worked examples
• Controlling the energy gap of a tunable two-level system by ac drive
• Sequential nonideal measurements of quantum oscillators: Statistical characterization with and without environmental coupling
• Fundamental limit to Qubit Control with Coherent Field
• Time-resolved qubit readout via nonlinear Josephson inductance
• Integration of highly probabilistic sources into optical quantum architectures: perpetual quantum computation
• Quantum superpositions of flow states on a ring
• Thin Spectrum States in Superconductors
• Quasi-particle transitions in charge-phase qubits probed by rf oscillations
• A unified approach to realize universal quantum gates in a coupled two-qubit system with fixed always-on coupling
• Entangled quantum currents in distant mesoscopic Josephson junctions
• Quantum logic operations and creation of entanglement in a scalable superconducting quantum computer with long-range constant interaction between qubits
• Conditional sign flip via teleportation
• Measurement of two-qubit states by quantum point contacts
• Contractive Schroedinger cat states for a free mass
• Single-Electron Measurements with a Micromechanical Resonator
• Influence of low-frequency noise on macroscopic quantum tunneling in superconducting circuits
• Influence of External Fields and Environment on the Dynamics of Phase Qubit-Resonator System
• Control of Decoherence and Correlation in Single Quantum Dissipative Oscillator Systems
• Dephasing of a Qubit due to Quantum and Classical Noise
• Coherent superconducting quantum pump
• Measuring charge based quantum bits by a superconducting single-electron transistor
• Quantitative Treatment of Decoherence
• DC-SQUID Sensitivity for Readout of Entangled State Quantum Bits
• Topological Insights from State Manipulation in a Classical Elastic System
• The two Josephson junction flux qubit with large tunneling amplitude
• Robustness of Decoherence-Free States for Charge Qubits under Local Non-uniformity
• Systematic construction of topological-nontopological hybrid universal quantum gates based on many-body Majorana fermion interactions
• Effects of quasiparticle tunneling in a circuit-QED realization of a strongly driven two-level system
• Generalized transmon Hamiltonian for Andreev spin qubits
• Interplay of classical and "quantum" capacitance in a one dimensional array of Josephson junctions
• How Do Schrödinger's Cats Die?
• Measurement errors in entanglement-assisted electron microscopy
• Short-time decoherence of Josephson charge qubits in Ohmic and 1/f noise environment
• Adiabatic Control of the Electron Phase in a Quantum Dot
• Preparation of GHZ states via Grover's quantum searching algorithm
• Limitations of Caldeira-Leggett model for description of phase transitions in superconducting circuits
• Universal quantum computing based on magnetic domain wall qubits
• Two-dimensional optomechanical crystal resonator in gallium arsenide
• Inferring superposition and entanglement from measurements in a single basis
• Decoherence by Internal Degrees of Freedom
• Control of transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator
• Two-dimensional tunneling in a SQUID
• Material matters in superconducting qubits
• Entanglement dynamics of a dc SQUID interacting with a single-mode radiation field
• Encoded probabilistic imaginary-time evolution on a trapped-ion quantum computer for ground and excited states of spin qubits
• Dynamical decoherence of a qubit coupled to a quantum dot or the SYK black hole
• Electric Aharonov-Bohm effect without a loop in a Cooper pair box
• Near-Landauer-Bound Quantum Computing Using Single Spins
• Mach-Zehnder interferometer with quantum beamsplitters
• Quantum deficits and correlations of two superconducting charge qubits
• Universal quantum computation based on Nano-Electro-Mechanical Systems
• Gap resonance in the classical dynamics of the current-biased Josephson tunnel junctions
• Learning from physics experiments, with quantum computers: Applications in muon spectroscopy
• Macroscopic Many-Qubit Interactions in Superconducting Flux Qubits
• Resonant microwave properties of a voltage-biased single-Cooper-pair transistor
• Quantum communication between trapped ions through a dissipative environment
• Superconducting charge qubits from a microscopic many-body perspective
• Dark Periods in Rabi Oscillations of Superconducting Phase Qubit Coupled to a Microscopic Two-Level System
• Majorana path integral for nonequilibrium dynamics of two-level systems
• Effects of Resonant Cavity on Macroscopic Quantum Tunneling of Fluxon in Long Josephson Junctions
• High-dimensional counterdiabatic quantum computing
• Indistinguishability of quantum states and rotation counting
• Capacitance-based Fermion parity read-out and predicted Rabi oscillations in a Majorana nanowire
• Energy Down Conversion between Classical Electromagnetic Fields via a Quantum Mechanical SQUID Ring
• Nonlocality of a free atomic wave packet
• Projective Measurement Scheme for Solid-State Qubits
• Noise in an SSET-resonator driven by an external field
• Strong coupling between a single-photon and a two-photon Fock state
• Transient spectrum of a single-Cooper-pair box with binomial states
• Geometric Curvature and Phase of the Rabi model
• Richardson model with complex level structure and spin-orbit coupling for hybrid superconducting islands: stepwise suppression of pairing and magnetic pinning
• Transduction of quantum information from charge qubit to nanomechanical cat-state
• Local Decoherence-free Macroscopic Quantum states
• Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields
• Entanglement Energetics in the Ground State
• Phase space topology of a switching current detector
• Effect of multiple charge traps on dephasing rates of a Josephson charge qubit system
• Qubit measurement using a quantum point contact with a quantum Langevin equation approach
• Diagonalizing the Hamiltonian of capacitively coupled superconducting phase qubits
• Spin transitions induced by a magnetic field in quantum dot molecules
• Control Paradigms for Quantum Engineering
• Charge-SQUID and Tunable Phase-slip Flux Qubit
• Derivation of Electron Spin Relaxation Rate by Electron-Phonon Interaction Using a New Diagram Method
• Pseudospin and Quantum Computation in Semiconductor Nanostructures
• Theory of packaged entangled states
• Nonreciprocal microwave transmission based on Gebhard-Ruckenstein hopping
• Bias current dependence of superconducting transition temperature in superconducting spin valve nanowires
• Plateau dynamics with quantized oscillations of a strongly driven qubit
• Universal quantum computer based on Carbon Nanotube Rotators
• Quantum Phase Transitions in a Model Hamiltonian Exhibiting Entangled Simultaneous Fermion-Pair and Exciton Condensations
• The quartic Blochnium: an anharmonic quasicharge superconducting qubit
• Open loop linear control of quadratic Hamiltonians with applications
• Efficient numerical approach for the simulations of high-power dispersive readout with time-dependent unitary transformation
• Control and readout of a transmon using a compact superconducting resonator
• Quantum coherence of a long-lifetime exciton-polariton condensate
• Frozonium: Freezing Anharmonicity in Floquet Superconducting Circuits
• Utility of NISQ devices: optimizing experimental parameters for the fabrication of Au atomic junction using gate-based quantum computers
• Photon and magnetic field controlled electron transport of a multiply-resonant photon-cavity double quantum dot system
• Simultaneous model selection and parameter estimation: A superconducting qubit coupled to a bath of incoherent two-level systems
• Transition from coherent mesoscopic single particle transport to proximity Josephson-current
• A Model for an Irreversible Bias Current in the Superconducting Qubit Measurement Process
• Method for finding the critical temperature of the island in a SET structure
• Cooperative effects in Josephson junctions in a cavity in the strong coupling regime
• Giant Relaxation Oscillations in a Very Strongly Hysteretic SQUID ring-Tank Circuit System
• Stability analysis of an ensemble of simple harmonic oscillators
• Parameter optimization for the unimon qubit
• Room-Temperature Pauli Spin Blockade and Current Rectification in 15-13-15 Armchair Graphene Nanoribbon Heterostructures
• Dynamical-Corrected Nonadiabatic Geometric Quantum Computation
• Pinch Resonances in a Radio Frequency Driven SQUID Ring-Resonator System
• Quantum manipulation and simulation using Josephson junction arrays
• Universal quantum logic gates in a scalable Ising spin quantum computer
• Dynamic Evolution of Flux Distributions in a Pulse-driven Superconductor by High-speed Magneto-optical Imaging
• Quantum dynamics of a single fluxon in Josephson junctions parallel arrays with large kinetic inductances
• Half-integer Shapiro-steps in superconducting qubit with a $\pi$-Josephson junction
• Single and double qubit gates by manipulating degeneracy
• Analysis of the spectroscopy of a hybrid system composed of a superconducting flux qubit and diamond NV centers
• Thermodynamics of autonomous optical Bloch equations
• A tunable macroscopic quantum system based on two fractional vortices
• Magnetic quantum coherence effect in Ni4 molecular transistors
• Labeling eigenstates of qubit-cavity systems based on the continuity of qubit occupancy: Detecting resonances to higher excited qubit states
• Dynamics of a superconducting qubit coupled to the quantized cavity field: a unitary transformation approach
• Decoherence by a nonlinear environment: canonical vs. microcanonical case
• Tutorial on Superconducting Quantum Circuits: From Basics to Applications
• Visualizing dissipative charge carrier dynamics at the nanoscale with superconducting charge qubit microscopy
• Decoherence induced by an ordered environment
• Dynamic generation of superflow in a fermionic ring through phase imprinting
• Entanglement of flux qubits through a joint detection of photons
• Vortex dynamics controlled by local superconducting enhancement
• Entangling spin and charge degrees of freedom in semiconductor quantum dots
• Optimal quantum resource generation in coupled transmons immersed in Markovian baths
• Quantum synchronization of qubits via dynamical Casimir effect
• Detecting the Unruh Effect via an Engineered Low-Mass Field in a Superconducting Qubit
• Decoherence and purity of a driven solid-state qubit in Ohmic bath
• Multiple resonant manipulation of qubits by train of pulses
• The Effect of Local Structure and Non-uniformity on Decoherence-Free States of Charge Qubits
• Influence of superconducting leads energy gap on electron transport through double quantum dot by Markovian quantum master equation approach
• Electronic and thermal sequential transport in metallic and superconducting two-junction arrays
• Geometric Phase of a Transmon in a Dissipative Quantum Circuit
• Delayed response to the photovoltaic performance in a double quantum dot photocell with spatially correlated fluctuation
• GHz operation of a quantum point contact using stub impedance matching circuit
• Dissipative dynamics of superconducting hybrid qubit systems
• Quantum Faraday Effect in Double-Dot Aharonov-Bohm Ring
• Quantum noise eater for a single photonic qubit
• Phase sensitive Landau-Zener-Stückelberg interference in superconducting quantum circuit
• Fast partial decoherence of a superconducting flux qubit in a spin bath
• Electron-photon coupling in Mesoscopic Quantum Electrodynamics
• Coupling modifies the quantum fluctuations of entangled oscillators
• Quantum beats of a magnetic fluxon in a two-cell SQUID
• A Method to Detect Quantum Coherent Transport in Memristive Devices
• Protecting information in a parametrically driven hybrid quantum system
• An Analysis of Mutual Communication between Qubits by Capacitive Coupling
• Nonlinear dynamical topological phases in Cooper-pair box array
• Single charge transport in a fully superconducting SQUISET locally tuned by self-inductance effects
• Leakage Mobility in Superconducting Qubits as a Leakage Reduction Unit
• Entanglement between distant atoms mediated by a hybrid quantum system consisting of superconducting flux qubit and resonators
• A toy model for Macroscopic Quantum Coherence
• Multiple Silicon Dangling-Bond Charge qubits for quantum computing: A Hilbert-Space Analysis of the Hamiltonian
• Perturbative approach to the capacitive interaction between a sensor quantum dot and a charge qubit
• On Collective Effects in Cavity Quantum Electrodynamics
• Compilation Techniques for Spin Qubits in a Shuttling Bus Architecture
• Strongly anharmonic flux-tunable transmon based on InAs-Al 2D heterostructure
• Quantum correlation generation capability of experimental processes
• Non-demolition fluorescence readout and high-fidelity unconditional reset of a fluxonium qubit via dissipation engineering
• Performance-centric roadmap for building a superconducting quantum computer
• Noninvasive and nonadiabatic quantum Maxwell demon
• Localizing Individual Exciton on a Quantum Hall Antidot
• Leggett-Garg Inequality for a Two-Level System under Decoherence: A Broader Range of Violation
• Transport properties of a periodically driven superconducting single electron transistor
• Current Fluctuations in Rough Superconducting Tunnel Junctions
• Pancharatnam phase deficit can detect macroscopic entanglement
• Detecting degenerate bands topological invariants in optical lattice
• Noise and the Measurement Process for a Circular Josephson Array Qubit
• Quantum entanglement of two flux qubits induced by an auxiliary SQUID
• Robust multi-mode superconducting circuit optimized for quantum information processing
• Holography of Transmission Lines: Insights of Continuous MERA and AdS/CFT
• Readout of superconducting flux qubit state with a Cooper pair box
• Utilizing discrete variable representations for decoherence-accurate numerical simulation of superconducting circuits
• Macroscopic quantum phenomena and quantum computing
• Practical hybrid decoding scheme for parity-encoded spin systems
• Quantum reservoir computing in Jaynes-Cummings models: Nonlinear memory and time-series prediction
• Orthogonal frequency-division multiplexing for simultaneous gate operations on multiple qubits via a shared control line
• Triple Antidot Molecules
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• Orbital-Angular-Momentum Entangled Photon Emission from Circular Currents in Semiconductor-Superconductor Structures
• The Rise of Quantum Computing -- Take a BITE for Built Environment and Urban Microclimate Research
• Chronicle: "Foot of the iceberg" of Nobel Prize in Physics 2025: ILTPE and LTP contribution
• The Nobel Prize in physics and the contribution of Ukrainian scientists to the understanding of quantum phenomena, in particular the behavior of macroscopic systems (The 2025 Nobel Prize in Physics)
• Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit
• Dephasing of coupled spin qubit system during gate operations due to background charge fluctuations
• Andreev molecule in parallel InAs nanowires
• Phonon trapping states as a witness for generation of phonon blockade in a hybrid micromaser system
• Dynamic phases induced by two-level system defects on driven qubits