Coherent Quantum Dynamics of a Superconducting Flux Qubit

2003/03/20 by I. Chiorescu, Yasunobu Nakamura, Y. Nakamura +2 · 74 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum optics and atomic interactions #cond-mat.mes-hall #cond-mat.supr-con

paper · pdf · doi:10.1126/science.1081045

published as Science, vol. 299, p. 1869 (2003) ; on-line at http://www.sciencemag.org/cgi/content/abstract/299/5614/1869 · submitted 2 December 2002; accepted 4 February 2003

openalex publication_date 2003/03/20 · arxiv created 2003/05/20 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Quantum-state engineering with Josephson-junction devices

Cited by

• Demonstration of conditional gate operation using superconducting charge qubits
• Flux Qubit Completes the Hat Trick
• Dynamics and thermalization of the nuclear spin bath in the single-molecule magnetMn12−ac: Test for the theory of spin tunneling
• Control of multilevel voltage states in a hysteretic superconducting-quantum-interference-device ring-resonator system
• Between classical and quantum
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Implementing Qubits with Superconducting Integrated Circuits
• Low-frequency noise in Josephson junctions for superconducting qubits
• Double SQUID tunable flux qubit manipulated by fast pulses: operation requirements, dissipation and decoherence
• Superconducting tunable flux qubit with direct readout scheme
• Crossover of phase qubit dynamics in the presence of a negative-result weak measurement
• Parametric Control of a Superconducting Flux Qubit
• Phase-space theory for dispersive detectors of superconducting qubits
• An optimal tunable Josephson element for quantum computing
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast Readout
• Microwave-Induced Cooling of a Superconducting Qubit
• Staying positive: going beyond Lindblad with perturbative master equations
• Superconducting π qubit with three Josephson junctions
• n-qubit-controlled phase gate with superconducting quantum-interference devices coupled to a resonator
• Realization of ann-qubit controlled-Ugate with superconducting quantum interference devices or atoms in cavity QED
• Characterization of coherent impurity effects in solid-state qubits
• Non-Markovian suppression of charge qubit decoherence in the quantum point contact measurement
• Topologically Decoherence-Protected Qubits with Trapped Ions
• Quantum mechanics with extended probabilities
• Quantum information processing with superconducting qubits in a microwave field
• Entanglement degradation in the solid state: Interplay of adiabatic and quantum noise
• Probing Decoherence with Electromagnetically Induced Transparency in Superconductive Quantum Circuits
• Shot Noise Spectrum of Open Dissipative Quantum Two-Level Systems
• Generating macroscopic-quantum-superposition states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions
• High-Contrast Dispersive Readout of a Superconducting Flux Qubit Using a Nonlinear Resonator
• Quantum state detection of a superconducting flux qubit using a dc-SQUID in the inductive mode
• Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus
• Arbitrary rotation and entanglement of flux SQUID qubits
• Critical Current 0−π Transition in Designed Josephson Quantum Dot Junctions
• Current fluctuations in rough superconducting tunnel junctions
• Optimal tuning of solid-state quantum gates: A universal two-qubit gate
• Vacuum Rabi Oscillations in a Macroscopic Superconducting QubitLCOscillator System
• Fast partial decoherence of a superconducting flux qubit in a spin bath
• Design of realistic switches for coupling superconducting solid-state qubits
• Coherent Quasiclassical Dynamics of a Persistent Current Qubit
• Dephasing of a Superconducting Flux Qubit
• Nonlinear resonant behavior of a dispersive readout circuit for a superconducting flux qubit
• Nanomechanical-resonator-assisted induced transparency in a Cooper-pair box system
• Variable Electrostatic Transformer: Controllable Coupling of Two Charge Qubits
• Exploiting environmental resonances to enhance qubit quality factors
• Quasiparticle Decoherence ind-Wave Superconducting Qubits
• Single-shot measurement of the Josephson charge qubit
• Coherent dynamics of a Josephson charge qubit
• Theoretical analysis of continuously driven dissipative solid-state qubits
• Decoherence and relaxation of a quantum bit in the presence of Rabi oscillations
• Flux qubits and readout device with two independent flux lines
• Structured environments in solid state systems: Crossover from Gaussian to non-Gaussian behavior
• Rapid ballistic readout for flux qubits
• Quantum storage and information transfer with superconducting qubits
• Quantum dynamics in the thermodynamic limit
• Observing the spontaneous breakdown of unitarity
• Superconducting qubits coupled to nanoelectromechanical resonators: An architecture for solid-state quantum-information processing
• Phase coherent dynamics of a superconducting flux qubit with capacitive bias readout
• Circuit QED with a flux qubit strongly coupled to a coplanar transmission line resonator
• Density matrix renormalization group study of a quantum impurity model with Landau-Zener time-dependent Hamiltonian
• Spin decoherence from Hamiltonian dynamics in quantum dots
• Initial Decoherence in Solid State Qubits
• Suspended single-electron transistors: Fabrication and measurement
• Population Inversion of a Driven Two-Level System in a Structureless Bath
• Silent phase qubit based ond-wave Josephson junctions
• Quantum computing by optical control of electron spins
• Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent-Current Qubit
• Asymptotic von Neumann measurement strategy for solid-state qubits
• Full control of qubit rotations in a voltage-biased superconducting flux qubit
• Spin transition in Gd3N@C80, detected by low-temperature on-chip SQUID technique
• Multilevel quantum description of decoherence in superconducting qubits
• Effective boundary field theory for a Josephson junction chain with a weak link
• Tabletop experiments for quantum gravity: a user’s manual
• Yasunobu Nakamura [wikipedia]