Coherent Quantum Dynamics of a Superconducting Flux Qubit

Abstract

We have observed coherent time evolution between two quantum states of a superconducting flux qubit comprising three Josephson junctions in a loop. The superposition of the two states carrying opposite macroscopic persistent currents is manipulated by resonant microwave pulses. Readout by means of switching-event measurement with an attached superconducting quantum interference device revealed quantum-state oscillations with high fidelity. Under strong microwave driving it was possible to induce hundreds of coherent oscillations. Pulsed operations on this first sample yielded a relaxation time of 900 nanoseconds and a free-induction dephasing time of 20 nanoseconds. These results are promising for future solid-state quantum computing.

submitted 2 December 2002; accepted 4 February 2003

References in corpus (3)

• Quantum state engineering with Josephson-junction devices
• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Manipulating the Quantum State of an Electrical Circuit

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• Tunable one-dimensional microwave emissions from cyclic-transition three-level atoms
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• Linear magnetic flux amplifier
• Entanglement in the dispersive interaction of trapped ions with a quantized field
• Non-equilibrium theory of charge qubit decoherence in the quantum point contact measurement
• Spin-boson dynamics: A unified approach from weak to strong coupling
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• Superconducting tunable flux qubit with direct readout scheme
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• Resonant Readout of a Persistent Current Qubit
• Structured environments in solid state systems: crossover from Gaussian to non-Gaussian behavior
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• Characterizing Coherent Errors using Matrix-Element Amplification
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• Subgap dynamics of double quantum dot coupled between superconducting and normal leads
• Aluminum Josephson junction microstructure and electrical properties modification with thermal annealing
• Entanglement generation in persistent current qubits
• Low-temperature environments for quantum computation and quantum simulation
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• Open Ising Model Perturbed by Classical Colored Noises
• Phenomenological noise model for superconducting qubits: two-state fluctuators and 1=f noise
• Macroscopic Entanglement of a Bose Einstein Condensate on a Superconducting Atom Chip
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• Time-Resolved Measurement of a Charge Qubit
• Classical analogs for Rabi-oscillations, Ramsey-fringes, and spin-echo in Josephson junctions
• Sensitivity to parameters of STIRAP in a Cooper-Pair Box
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• Landau-Zener-Stückelberg Spectroscopy of a Superconducting Flux Qubit
• Coherent Rabi response of a charge-phase qubit under microwave irradiation
• Decoherence without dissipation?
• Beyond spontaneously broken symmetry in Bose-Einstein condensates
• Zeno-anti-Zeno crossover via external fields in a one-dimensional coupled-cavity waveguide
• Non-monotonic Dynamics in Frustrated Ising Model with Time-Dependent Transverse Field
• Adiabatic evolution of a coupled-qubit Hamiltonian
• Decoherence of Josephson charge qubit
• Diamond as a solid state quantum computer with a linear chain of nuclear spins system
• Non-Markovian coherence dynamics of driven spin boson model: damped quantum beat or large amplitude coherence oscillation
• Feedback control of persistent-current oscillation based on the atomic-clock technique
• Realisation of Qudits in Coupled Potential Wells
• Quantum chaos in the mesoscopic device for the Josephson flux qubit
• Correlated Worldline theory: Structure and Consistency
• Gate-tunable superconducting quantum interference devices of PbS nanowires
• Integration of highly probabilistic sources into optical quantum architectures: perpetual quantum computation
• Ultrastrong coupling in a scalable design for circuit QED with superconducting flux qubits
• Improving the purity of one- and two-qubit gates by AC fields
• Revealing the system-bath coupling via Landau-Zener-Stückelberg interferometry in superconducting qubits
• Quantum emulation of coherent backscattering in a system of superconducting qubits
• Pulse and hold strategy for switching current measurements
• Numerical simulation of leakage effect for quantum NOT operation on three-Josephson-junction flux qubit
• A unified approach to realize universal quantum gates in a coupled two-qubit system with fixed always-on coupling
• A phononic crystal coupled to a transmission line via an artificial atom
• Entangled quantum currents in distant mesoscopic Josephson junctions
• The direction of time and Boltzmann's time hypothesis
• Quantum logic operations and creation of entanglement in a scalable superconducting quantum computer with long-range constant interaction between qubits
• Superconducting materials - a topical overview
• Manifold algorithmic errors in quantum computers with static internal imperfections
• An Optimal Tunable Josephson Element for Quantum Computing
• Quantum instability in a dc-SQUID with strongly asymmetric dynamical parameters
• Short-time decoherence of Josephson charge qubits in Ohmic and 1/f noise environment
• Phase order in superfluid helium films
• Control of transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator
• Inferring superposition and entanglement from measurements in a single basis
• Simulation of some quantum gates, with decoherence
• Noncentrosymmetric Triangular Magnet CaMnTeO${}_6$: Strong Quantum Fluctuations and Role of s0 vs. s2 Electronic States in Competing Exchange Interactions
• Probing higher-order transitions through scattering of microwave photons in the ultrastrong-coupling regime of circuit QED
• Nuclear magnetic resonance spectroscopy with a superconducting flux qubit
• How Do Schrödinger's Cats Die?
• Coherent oscillations between classically separable quantum states of a superconducting loop
• Investigation of low temperature quantum crossover in Josephson junctions
• Analysis of the shortest vector problems with the quantum annealing to search the excited states
• Creation of entanglement in a scalable spin quantum computer with long-range dipole-dipole interaction between qubits
• Influence of low-frequency noise on macroscopic quantum tunneling in superconducting circuits
• Material matters in superconducting qubits
• Objective realism and Joint Measurability in Quantum Many Copies
• Static properties of two linearly coupled discrete circuits
• Energy Down Conversion between Classical Electromagnetic Fields via a Quantum Mechanical SQUID Ring
• Stochastic thermal feedback in switching measurements of superconducting nanobridge caused by overheated electrons and phonons
• Macroscopic Many-Qubit Interactions in Superconducting Flux Qubits
• Mapping generalized Jaynes-Cummings interaction into correlated finite-sized systems
• Majorana path integral for nonequilibrium dynamics of two-level systems
• Dark Periods in Rabi Oscillations of Superconducting Phase Qubit Coupled to a Microscopic Two-Level System
• Effect of Ohmic environment on optimally controlled flux-biased phase qubit
• Complementarity between decoherence and information retrieval from the environment
• Static flux bias of a flux qubit using persistent current trapping
• Decoherence: From Interpretation to Experiment
• Projective Measurement Scheme for Solid-State Qubits
• Characterising a solid state qubit via environmental noise
• Integrating Quantum Processor Device and Control Optimization in a Gradient-based Framework
• Current Amplification with Vertical Josephson Interferometers
• Phase space topology of a switching current detector
• Robust coupling of superconducting order parameter in a mesoscale NbN-Fe-NbN epitaxial structure
• The quantum mechanics is a non-universal theory. The realistic Schrodinger's and positivistic Born's interpretation of the wave function
• Mesoscopic fluctuations in biharmonically driven flux qubits
• Observation of Higher-Order Sideband Transitions and First-Order Sideband Rabi Oscillations in a Superconducting Flux Qubit Coupled to a SQUID Plasma Mode
• A Model for an Irreversible Bias Current in the Superconducting Qubit Measurement Process
• Flux-qubit and the law of angular momentum conservation
• Four-junction superconducting circuit
• Diagonalizing the Hamiltonian of capacitively coupled superconducting phase qubits
• Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields
• Macroscopic superposition states in rotating ring lattices
• Consistent perturbative treatment of the subohmic spin-boson model yielding arbitrarily small $T_2/T_1$ decoherence time ratios
• Hybrid Quantum Interferometer in Bifurcation Mode as a Latching Quantum Readout
• Quantum Coherence in Superconducting Vortex States
• A Finite-Time Quantum Otto Engine subject to Control Noise and Enhancement Techniques
• Flux-Tunable Regimes and Supersymmetry in Twisted Cuprate Heterostructures
• Tunability of Excited-State Energy Levels of Four-Josephson-Junction Circuit in Crossover from Double-Well to Single-Well Potential
• Pointer States in the Born-Markov approximation
• Quantum manipulation and simulation using Josephson junction arrays
• Ultranarrow spectral line of the radiation in double qubit-cavity ultrastrong coupling system
• Stability analysis of an ensemble of simple harmonic oscillators
• Analysis of the spectroscopy of a hybrid system composed of a superconducting flux qubit and diamond NV centers
• Entangling spin and charge degrees of freedom in semiconductor quantum dots
• Half-integer Shapiro-steps in superconducting qubit with a $\pi$-Josephson junction
• Coherent quantum dynamics of systems with coupling-induced creation pathways
• Decoherence of Dynamically Manipulated Qubits
• Ultrastrong capacitive coupling of flux qubits
• Observing the Spontaneous Breakdown of Unitarity
• Simulation of a rapid qubit readout dependent on the transmission of a single fluxon
• Localizing Individual Exciton on a Quantum Hall Antidot
• Optimal effective current operator for flux qubit accounting for inductive effects
• Multiple resonant manipulation of qubits by train of pulses
• Fast partial decoherence of a superconducting flux qubit in a spin bath
• Quantum noise eater for a single photonic qubit
• The dynamically asymmetric SQUID: Münchhausen effect
• Fabrication and Characterization of Superconducting Quantum Interference Device using (Bi_{1-x}Sb_x)_2Se_3 Topological Insulator Nanoribbons
• Ramsey-biased spectroscopy of superconducting qubits under dispersion
• Phase sensitive Landau-Zener-Stückelberg interference in superconducting quantum circuit
• Control of Multi-level Voltage States in a Hysteretic SQUID Ring-Resonator System
• Decoherence and purity of a driven solid-state qubit in Ohmic bath
• $C^{12}-C^{13}$ Quantum computer with longitudinal rf-magnetic field
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• Quantum synchronization in disordered superconducting metamaterials
• Over forty years of research towards the understanding of Quantum Brownian Motion -- the contributions of A. O. Caldeira
• Three-Josephson Junctions Flux Qubit Couplings
• Decoherence of V${}_{\mathrm{B}}^{-}$ spin defects in monoisotopic hexagonal boron nitride
• Current Fluctuations in Rough Superconducting Tunnel Junctions
• The fundamental obscurity in quantum mechanics. Could the problem be considered universal?
• Characterization and generation of a SQL-beating catlike state through repetitive measurements
• Quantum computation and hidden variables
• Dirac four-potential tunings-based quantum transistor utilizing the Lorentz force
• Controllable conditional quantum oscillations and synchronization in superconducting flux qubits
• Quantum Information Processing with Continuous Variables and Atomic Ensembles
• Dissipation in Josephson tunneling junctions at low temperatures
• Observation of flux qubit states with the help of a superconducting differential double contour interferometer
• Teleportation via spin-1/2 chain in solid-state quantum architecture
• Orbital-Angular-Momentum Entangled Photon Emission from Circular Currents in Semiconductor-Superconductor Structures