Quantum oscillations in two coupled charge qubits

Abstract

Despite an apparent progress in implementing individual solid-state qubits, there have been no experimental reports so far on multi-bit gates required for building a real quantum computer. Here we report a new circuit comprising two coupled charge qubits. Using a pulse technique, we coherently mix quantum states and observe quantum oscillations whose spectrum reflects interaction between the qubits. Our results demonstrate the feasibility of coupling of multiple solid-state qubits and indicate the existence of entangled two-qubit states.

4 pages, 4 figures, submitted to Nature

Cited by in corpus (342)

• Circuit Quantum Electrodynamics
• Superconducting Circuits and Quantum Information
• Decoherence in Josephson Qubits from Dielectric Loss
• Towards Quantum Chemistry on a Quantum Computer
• Coherent manipulation of electronic states in a double quantum dot
• Coherent dynamics of a flux qubit coupled to a harmonic oscillator
• Quantum information processing with circuit quantum electrodynamics
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Decoherence in a superconducting quantum bit circuit
• Demonstration of conditional gate operation using superconducting charge qubits
• 1/f noise: implications for solid-state quantum information
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit
• Decoherence in Josephson Qubits from Junction Resonances
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Measures and dynamics of entangled states
• Quantum information processing with superconducting qubits in a microwave field
• Quantum noise in the Josephson charge qubit
• Vacuum Rabi oscillations in a macroscopic superconducting qubit LC oscillator system
• Spectroscopy on two coupled flux qubits
• Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
• State tomography of capacitively shunted phase qubits with high fidelity
• A magneto-optic modulator with unit quantum effciency
• Arbitrary accuracy iterative phase estimation algorithm as a two qubit benchmark
• Quantum logic gates for coupled superconducting phase qubits
• Quantum Computation by Communication
• Superconducting Nanocircuits for Topologically Protected Qubits
• Decoherence in Solid State Qubits
• Controllable coupling of superconducting flux qubits
• Fast Quantum Modular Exponentiation
• Two-Qubit State Tomography using a Joint Dispersive Read-Out
• Microwave-induced coupling of superconducting qubits
• Dephasing of solid-state qubits at optimal points
• Decoherence in Josephson-junction qubits due to critical current fluctuations
• Coherence Time of a Solid-State Nuclear Qubit
• Variable electrostatic transformer: controllable coupling of two charge qubits
• Geometric quantum computation and multi-qubit entanglement with superconducting charge qubits inside a cavity
• Evidence for entangled states of two coupled flux qubits
• Electrical detection of 31P spin quantum states
• Initial decoherence in solid state qubits
• Selective coupling of superconducting qubits via tunable stripline cavity
• Controllable coupling between flux qubits
• Interfacing quantum optical and solid state qubits
• Parametric coupling for superconducting qubits
• NMR-like control of a quantum bit superconducting circuit
• Controllable manipulation and entanglement of macroscopic quantum states in coupled charge qubits
• Shot Noise Spectrum of Open Dissipative Quantum Two-level Systems
• Robust optimal quantum gates for Josephson charge qubits
• Generation and control of Greenberger-Horne-Zeilinger entanglement in superconducting circuits
• Optimal Control of Coupled Josephson Qubits
• Rigorous Born Approximation and beyond for the Spin-Boson Model
• Sideband Transitions and Two-Tone Spectroscopy of a Superconducting Qubit Strongly Coupled to an On-Chip Cavity
• Protocol for universal gates in optimally biased superconducting qubits
• Many-Body Quantum Electrodynamics Networks: Non-Equilibrium Condensed Matter Physics with Light
• Arbitrary rotation and entanglement of flux SQUID qubits
• Ultrafast control of Rabi oscillations in a polariton condensate
• Decoherence and gate performance of coupled solid state qubits
• Superconducting Spin Qubits
• Scalable superconducting qubit circuits using dressed states
• Rapid Lyapunov control of finite-dimensional quantum systems
• Circuit QED and engineering charge based superconducting qubits
• Complementary classical fidelities as an efficient criterion for the evaluation of experimentally realized quantum operations
• RFSQUID-Mediated Coherent Tunable Coupling Between a Superconducting Phase Qubit and a Lumped Element Resonator
• Efficient generation of graph states for quantum computation
• Topological states and braiding statistics using quantum circuits
• Kondo Resonance of a Microwave Photon
• Preparation of macroscopic quantum superposition states of a cavity field via coupling to a superconducting charge qubit
• Superconducting Qubits Coupled to Nanoelectromechanical Resonators: An Architecture for Solid-State Quantum Information Processing
• Entanglement of superconducting qubits via microwave fields: classical and quantum regimes
• Measuring the decoherence rate in a semiconductor charge qubit
• Single-shot measurement of the Josephson charge qubit
• Efficient one-step generation of large cluster states with solid-state circuits
• Non-Markovian disentanglement dynamics of two-qubit system
• Interqubit coupling mediated by a high-excitation-energy quantum object
• Entanglement between two superconducting qubits via interaction with non-classical radiation
• Entanglement dynamics in chains of qubits with noise and disorder
• Probing Decoherence with Electromagnetically Induced Transparency in Superconductive Quantum Circuits
• Robust manipulation of superconducting qubits in the presence of fluctuations
• Simple unconventional geometric scenario of one-way quantum computation with superconducting qubits inside a cavity
• Fast two-bit operations in inductively coupled flux qubits
• Cavity-mediated coupling of mechanical oscillators limited by quantum backaction
• Entanglement between charge qubits induced by a common dissipative environment
• Quantum two level systems and Kondo-like traps as possible sources of decoherence in superconducting qubits
• Sampling-based Learning Control for Quantum Systems with Uncertainties
• Quantum phases in circuit QED with a superconducting qubit array
• Superconducting qubits can be coupled and addressed as trapped ions
• Tomographic measurements on superconducting qubit states
• Models of environment and T_1 relaxation in Josephson Charge Qubits
• Anticorrelation between temperature and fluctuations in moderately damped Josephson junctions
• Decoherence by a chaotic many-spin bath
• Observing the Nonequilibrium Dynamics of the Quantum Transverse-Field Ising Chain in Circuit QED
• Steady-state entanglement and coherence of the coupled qubit system in equilibrium and nonequilibrium environments
• Driven dissipative dynamics and topology of quantum impurity systems
• Coherent output of photons from coupled superconducting transmission line resonators controlled by charge qubits
• Mediated tunable coupling of flux qubits
• Low-Temperature Decoherence of Qubit Coupled to Background Charges
• Metric on the space of quantum states from relative entropy. Tomographic reconstruction
• Quantum computation with Josephson-qubits by using a current-biased information bus
• Decoherence of a Josephson qubit due to coupling to two level systems
• Spectroscopy of Three-Particle Entanglement in a Macroscopic Superconducting Circuit
• Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes
• Interaction-free measurements with superconducting qubits
• Electrical current noise of a beam splitter as a test of spin-entanglement
• Large-amplitude driving of a superconducting artificial atom: Interferometry, cooling, and amplitude spectroscopy
• Cross Kerr Effect Induced by Coupled Josephson Qubits in Circuit Quantum Electrodynamics
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Non-Markovian dissipative dynamics of two coupled qubits in independent reservoirs: a comparison between exact solutions and master equation approaches
• Triangle geometry of the qubit state in the probability representation expressed in terms of the triada of Malevich's Squares
• Josephson junction qubit network with current-controlled interaction
• Anomalous avoided level crossings in a Cooper-pair box spectrum
• Coherent oscillations in a superconducting tunable flux qubit manipulated without microwaves
• Microscopic Model of Critical Current Noise in Josephson Junctions
• Dissipation in Josephson qubits
• Macroscopic Einstein-Podolsky-Rosen pairs in superconducting circuits
• Continuous quantum measurement: inelastic tunnelling suppresses current oscillations
• Entanglement degradation in the solid state: interplay of adiabatic and quantum noise
• Electromagnetically induced transparency in superconducting quantum circuits : Effects of decoherence, tunneling and multi-level cross-talk
• Quantum information processing using Josephson junctions coupled through cavities
• Radio-Frequency Method for Investigation of Quantum Properties of Superconducting Structures
• Hybrid quantum magnetism in circuit-QED: from spin-photon waves to many-body spectroscopy
• Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus
• High-fidelity quantum operations on superconducting qubits in the presence of noise
• Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit
• Tripartite interactions between two phase qubits and a resonant cavity
• Protecting entanglement in superconducting qubits
• Is charge noise in single electron transistors and charge qubits caused by metallic grains?
• Measuring the quality factor of a microwave cavity using superconduting qubit devices
• Circuit theory for decoherence in superconducting charge qubits
• Multiphoton transitions in Josephson-junction qubits (Review Article)
• Entanglement genesis under continuous parity measurement
• Measurement crosstalk between two phase qubits coupled by a coplanar waveguide
• Quantum simulation of Anderson and Kondo lattices with superconducting qubits
• Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity
• Universal non-adiabatic control of small-gap superconducting qubits
• Strong and weak coupling of two coupled qubits
• Strong many-particle localization and quantum computing with perpetually coupled qubits
• Coherence control for qubits
• Testing Bell's inequality in constantly coupled Josephson circuits by effective single-qubit operations
• Entangling capacities of noisy two-qubit Hamiltonians
• Strong tunable coupling between a superconducting charge and phase qubit
• Quantum behaviour of a flux qubit coupled to a resonator
• Saturation of Two Level Systems and Charge Noise in Josephson Junction Qubits
• Generalized switchable coupling for superconducting qubits using double resonance
• Optimal tuning of solid-state quantum gates: A universal two-qubit gate
• Reducing Spontaneous Emission in Circuit Quantum Electrodynamics by a Combined Readout/Filter Technique
• Perturbative results on localization for a driven two-level system
• Optimized design of universal two-qubit gates
• Probing Quantum Phase Transition in Macroscopic Qubit Array via circuit QED architecture
• Quantum electromechanics: Quantum tunneling near resonance and qubits from buckling nanobars
• Robust two-qubit quantum registers
• Simple quantum feedback of a solid-state qubit
• Spectroscopy of three strongly coupled flux qubits
• CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement
• Decoherence times of universal two-qubit gates in the presence of broad-band noise
• Generating Schrödinger-cat states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions
• Control-limited perfect state transfer, quantum stochastic resonance and many-body entangling gate in imperfect qubit registers
• Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large junction
• Quantum storage and information transfer with superconducting qubits
• Computation on Spin Chains with Limited Access
• Entanglement and quantum state engineering in the optically driven two-electron double-dot structure
• Cyclic solid-state quantum battery: Thermodynamic characterization and quantum hardware simulation
• Superconducting qubit network with controllable nearest neighbor coupling
• Four-level and two-qubit systems, sub-algebras, and unitary integration
• Exact non-Markovian master equation for a driven damped two-level system
• Quantum coherence in a compass chain under an alternating magnetic field
• Decoherence of a two-qubit system with a variable bath coupling operator
• Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
• Tunable coupling of qubits: nonadiabatic corrections
• On the generation of multipartite entangled states in Josephson architectures
• Macroscopic Greenberger-Horne-Zeilinger and W States in Flux Qubits
• Superconducting qubit manipulated by fast pulses: experimental observation of distinct decoherence regimes
• Dispersive Manipulation of Paired Superconducting Qubits
• Geometric phase gate for entangling two Bose-Einstein condensates
• Theory of measurement crosstalk in superconducting phase qubits
• Quantum process tomography of a controlled-phase gate for time-bin qubits
• Concentration and purification of entanglement for qubit systems with ancillary cavity fields
• Effects of low-frequency noise cross-correlations in coupled superconducting qubits
• Switchable coupling for superconducting qubits using double resonance in the presence of crosstalk
• Two-particle localization and antiresonance in disordered spin and qubit chains
• Why Study Noise due to Two Level Systems: A Suggestion for Experimentalists
• Quantum state detection of a superconducting flux qubit using a DC-SQUID in the inductive mode
• Controlled Quantum Operations of a Semiconductor Three-Qubit System
• Spectroscopy of a driven solid-state qubit coupled to a structured environment
• Evidence of Cooper pair pumping with combined flux and voltage control
• Quantum tomography for solid state qubits
• Decoherence of charge qubit coupled to interacting background charges
• Hybridized solid-state qubit in the charge-flux regime
• Geometric phase for SU(N) through fiber bundles and unitary integration
• Implementing topological quantum manipulation with superconducting circuits
• Correlated vs. uncorrelated noise acting on a quantum refrigerator
• Rapid state purification protocols for a Cooper pair box
• Quantum holonomies with Josephson-junction devices
• On the Exponential of Matrices in su(4)
• Spectral Analysis and Identification of Noises in Quantum Systems
• Full control of qubit rotations in a voltage-biased superconducting flux qubit
• Variable-frequency-controlled coupling in charge qubit circuits: Effects of microwave field on qubit-state readout
• Measurement of Two-Qubit States by a Two-Island Single Electron Transistor
• Double-dot charge qubit and transport via dissipative cotunneling
• Fluctuations of the Josephson current and electron-electron interactions in superconducting weak links
• Qubit decoherence by low-frequency noise
• Josephson charge-phase qubit with radio frequency readout: coupling and decoherence
• Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit
• Implementing Shor's algorithm on Josephson Charge Qubits
• Quantum memory coupled to cavity modes
• Characterization of an entangled system of two superconducting qubits using a multiplexed capacitance readout
• Macroscopic tunnel splittings in superconducting phase qubits
• Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor
• Coupling Josephson qubits via a current-biased information bus
• CMOS Quantum Computing: Toward A Quantum Computer System-on-Chip
• Multiphoton excitations and inverse population in two-flux-qubit system
• Always On Non-Nearest-Neighbor Coupling in Scalable Quantum Computing
• Coupling of Josephson current qubits using a connecting loop
• 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
• Measurements of 1/ f noise in Josephson junctions at zero voltage: Implications for decoherence in superconducting quantum bits
• Robust stationary entanglement of two coupled qubits in independent environments
• Analysis of Bell inequality violation in superconducting qubits
• Guidance and Control in a Josephson Charge Qubit
• Correlations in a system of classical--like coins simulating spin-1/2 states in the probability representation of quantum mechanics
• Mimicking Time Evolution within a Quantum Ground State: Ground-State Quantum Computation, Cloning, and Teleportation
• Crossovers in spin-boson and central spin models
• Full protection of superconducting qubit systems from coupling errors
• Quantum transport of double quantum dots coupled to an oscillator in arbitrary strong coupling regime
• Dissipative dynamics of a two-qubit system: Four-level lasing
• Non-invasive detection of the evolution of the charge states of a double dot system
• Active suppression of dephasing in Josephson-junction qubits
• Decoherence dynamics of a qubit coupled to a quantum two-level system
• Nanosecond quantum state detection in a current biased dc SQUID
• Measurement of the ground-state flux diagram of three coupled qubits as a first step towards the demonstration of adiabatic quantum computation
• Stabilizing Rabi Oscillation of a Charge Qubit via Atomic Clock Technique
• Synthesis of maximally entangled mixed states and disentanglement in coupled Josephson charge qubits
• Molecular Ensemble Based Remote Quantum Storage for Charge Qubit via Quasi-Dark State
• Phase sensitive amplification in a superconducting stripline resonator integrated with a dc-SQUID
• Quantum Dynamics of a Microwave Driven Superconducting Phase Qubit Coupled to a Two-Level System
• Controlled phase gate for solid-state charge qubits
• Quantum parallelism of the controlled-NOT operation: an experimental criterion for the evaluation of device performance
• Charge shelving and bias spectroscopy for the readout of a charge-qubit on the basis of superposition states
• Rabi Oscillations in Systems with Small Anharmonicity
• Tunneling of Cooper pairs across voltage biased asymmetric single-Cooper-pair transistors
• Direct measurement of the quantum state of the electromagnetic field in a superconducting transmission line
• Analysis of measurement errors for a superconducting phase qubit
• Antiresonance and interaction-induced localization in spin and qubit chains with defects
• Rapid optimization of working parameters of microwave-driven multi-level qubits for minimal gate leakage
• Detection of Geometric Phases in Flux Qubits with Coherent Pulses
• Suspended single-electron transistors: fabrication and measurement
• Digital-analog quantum simulation of fermionic models
• Charge qubit rotations in a double-dot nanostructure
• Entanglement of superconducting charge qubits by homodyne measurement
• Controllable Coupling in Phase-Coupled Flux Qubits
• Modulation of dephasing due to a spin-boson environment
• Thermal local quantum uncertainty in a two-qubit-superconducting system under decoherence
• Implementation of the three-qubit phase-flip error correction code with superconducting qubits
• Tunable Flux Qubit manipulated by fast pulses: operating requirements, dissipation and decoherence
• Experimentally Realizable C-NOT Gate in a Flux Qubit/Resonator System
• Entanglement and Bell States in Superconducting Flux Qubits
• Sub Decoherence Time Generation and Detection of Orbital Entanglement
• Improving Intrinsic Decoherence in Multi-Quantum-Dot Charge Qubits
• A Mesoscopic Resonating Valence Bond system on a triple dot
• Crossover from weak to strong coupling regime in dispersive circuit QED
• Investigation of resonant and transient phenomena in Josephson junction flux qubits
• Structured environments in solid state systems: crossover from Gaussian to non-Gaussian behavior
• Encoding a logical qubit into physical qubits
• Superconducting tunable flux qubit with direct readout scheme
• Collective quantum phase slips in multiple nanowire junctions
• Dynamics of coupled spins in the white- and quantum-noise regime
• Broadband noise decoherence in solid-state complex architectures
• Beyond spontaneously broken symmetry in Bose-Einstein condensates
• Charge-based silicon quantum computer architectures using controlled single-ion implantation
• Discontinuous current-phase relations in small 1D Josephson junction arrays
• Landau-Zener-Stückelberg Spectroscopy of a Superconducting Flux Qubit
• A nonlinear mechanism of charge qubit decoherence in a lossy cavity: the quasi normal mode approach
• Adiabatic evolution of a coupled-qubit Hamiltonian
• Evaluation of Decoherence for Quantum Computing Architectures: Qubit System Subject to Time-Dependent Control
• Cryogenic instrumentation for fast current measurement in a silicon single electron transistor
• Entanglement of qubits via a nonlinear resonator
• High efficiency tomographic reconstruction of quantum states by quantum nondemolition measurements
• Arrays of Cooper Pair Boxes Coupled to a Superconducting Reservoir: `Superradiance' and `Revival.'
• Steady-state entanglement enhanced by a dissipative ancilla
• Spectroscopy of a Cooper-Pair box in the Autler-Townes configuration
• An interleaved sampling scheme for the characterization of single qubit dynamics
• Decoherence of Josephson charge qubit
• Thermal entanglement in superconducting quantum-interference-device qubits coupled to cavity field
• Charge Qubit Storage and Its Engineered Decoherence via Microwave Cavity
• Many-particle confinement by constructed disorder and quantum computing
• Auxiliary-level-assisted operations with charge qubits in semiconductors
• Non-Markovian coherence dynamics of driven spin boson model: damped quantum beat or large amplitude coherence oscillation
• Improving the purity of one- and two-qubit gates by AC fields
• A unified approach to realize universal quantum gates in a coupled two-qubit system with fixed always-on coupling
• Measurement of two-qubit states by quantum point contacts
• Quantum logic operations and creation of entanglement in a scalable superconducting quantum computer with long-range constant interaction between qubits
• Mapping a cloud of ultracold atoms onto a miniature storage ring
• Creation of entanglement in a scalable spin quantum computer with long-range dipole-dipole interaction between qubits
• Continuous measurements of two qubits
• Coherent superconducting quantum pump
• How Do Schrödinger's Cats Die?
• Short-time decoherence of Josephson charge qubits in Ohmic and 1/f noise environment
• Readout of solid-state charge qubits using a single-electron pump
• Simulation of some quantum gates, with decoherence
• Macroscopic Many-Qubit Interactions in Superconducting Flux Qubits
• Effects of Resonant Cavity on Macroscopic Quantum Tunneling of Fluxon in Long Josephson Junctions
• Quantum Simulation of Pairing Hamiltonians with Nearest-Neighbor Interacting Qubits
• Transient spectrum of a single-Cooper-pair box with binomial states
• Hidden correlations in indivisible qudits as a resource for quantum technologies on examples of superconducting circuits
• Quantum phase diagrams of Dicke-Ising models by a wormhole algorithm
• Laser-induced operations with charge qubits in a double-well nanostructure
• Quantum deficits and correlations of two superconducting charge qubits
• Superconducting charge qubits from a microscopic many-body perspective
• Method for finding the critical temperature of the island in a SET structure
• Role of Matter Interactions in Superradiant Phenomena
• Utility of NISQ devices: optimizing experimental parameters for the fabrication of Au atomic junction using gate-based quantum computers
• Superconductor-ferromagnet junction phase qubit
• Analysis of an experimental quantum logic gate by complementary classical operations
• A Model for an Irreversible Bias Current in the Superconducting Qubit Measurement Process
• Diagonalizing the Hamiltonian of capacitively coupled superconducting phase qubits
• Bypassing state initialization in Hamiltonian tomography on spin-chains
• Electromagnetic waves propagation through an array of superconducting qubits: manifestations of non-equilibrium steady states of qubits
• Stability analysis of an ensemble of simple harmonic oscillators
• Characterisation of spatial charge sensitivity in a multi-mode superconducting qubit
• Quantum manipulation and simulation using Josephson junction arrays
• Stability of longitudinal coupling for Josephson charge qubits
• Signatures of molecular correlations in the few-electron dynamics of coupled quantum dots
• Decoherence of Dynamically Manipulated Qubits
• Effects of Strong Capacitive Coupling Between Meta-Atoms in rf SQUID Metamaterials
• Fast partial decoherence of a superconducting flux qubit in a spin bath
• Entanglement versus cooling in the system of a driven pair of two-level qubits longitudinally coupled with a boson mode field
• Electronic and thermal sequential transport in metallic and superconducting two-junction arrays
• Dynamical decoupling of superconducting qubits
• Josephson Current in Ballistic Graphene Corbino Disk
• Generation and Manipulation of Entanglement in Quantum Optical Systems
• Readout of superconducting flux qubit state with a Cooper pair box
• Modeling Three and Four Coupled Phase Qubits
• Energies and Entanglement in Multiply-coupled Phase Qubit Systems
• Preparation and manipulation of a fault-tolerant superconducting qubit
• Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit
• Current Fluctuations in Rough Superconducting Tunnel Junctions
• Quantum entanglement of two flux qubits induced by an auxiliary SQUID
• Geometry and Dynamics of Quantum State Diffusion
• Controlled-Not Quantum Logic Gate in Two Strongly Coupled Semiconductor Charge Qubits
• The Partition Formalism and New Entropic-Information Inequalities for Real Numbers on an Example of Clebsch-Gordan Coefficients
• Asymmetric steerability of quantum equilibrium and nonequilibrium steady states through entanglement detection
• Holography of Transmission Lines: Insights of Continuous MERA and AdS/CFT
• Certification of spin-based quantum simulators