Nondestructive readout for a superconducting flux qubit

Abstract

We present a new readout method for a superconducting flux qubit, based on the measurement of the Josephson inductance of a superconducting quantum interference device that is inductively coupled to the qubit. The intrinsic flux detection efficiency and back-action are suitable for a fast and nondestructive determination of the quantum state of the qubit, as needed for readout of multiple qubits in a quantum computer. We performed spectroscopy of a flux qubit and we measured relaxation times of the order of 80 $\mu s$.

4 pages, 4 figures; modified content, figures and references; accepted for publication in Phys. Rev. Lett

References in corpus (7)

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Manipulating the Quantum State of an Electrical Circuit
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Demonstration of conditional gate operation using superconducting charge qubits
• Coherent dynamics of a Josephson charge qubit
• Low-frequency measurement of the tunneling amplitude in a flux qubit
• Radio-frequency Bloch-transistor electrometer

Cited by in corpus (72)

• Introduction to Quantum Noise, Measurement and Amplification
• Microwave photonics with superconducting quantum circuits
• AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
• An RF-Driven Josephson Bifurcation Amplifier for Quantum Measurements
• Dephasing of a superconducting qubit induced by photon noise
• Quantum non-demolition measurement of a superconducting two-level system
• Two-resonator circuit QED: A superconducting quantum switch
• Superconducting Qubits: A Short Review
• Dispersive measurements of superconducting qubit coherence with a fast, latching readout
• High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator
• Measurement of a Superconducting Qubit with a Microwave Photon Counter
• Controllable Coupling between Flux Qubit and Nanomechanical Resonator by Magnetic Field
• Dynamics of dispersive single qubit read-out in circuit quantum electrodynamics
• Four-qubit device with mixed couplings
• Silent Phase Qubit Based on d-Wave Josephson Junctions
• Macroscopic quantum effects in a strongly driven nanomechanical resonator
• Phase-locking transition in a chirped superconducting Josephson resonator
• Possible implementation of adiabatic quantum algorithm with superconducting flux qubits
• Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator
• Dissipative dynamics of a biased qubit coupled to a harmonic oscillator: Analytical results beyond the rotating wave approximation
• Fast quantum limited read-out of a superconducting qubit using a slow oscillator
• Fidelity and quantum chaos in the mesoscopic device for the Josephson flux qubit
• Phase-Coherent Dynamics of a Superconducting Flux Qubit with Capacitive-Bias Readout
• Dynamics of the quantum Duffing oscillator in the driving induced bistable regime
• Controllable coupling between a nanomechanical resonator and a coplanar-waveguide resonator via a superconducting flux qubit
• Exploring More-Coherent Quantum Annealing
• Intrinsic leakage of the Josephson flux qubit and breakdown of the two-level approximation for strong driving
• Quantum state detection of a superconducting flux qubit using a DC-SQUID in the inductive mode
• Relaxation of a qubit measured by a driven Duffing oscillator
• Low frequency Rabi spectroscopy for a dissipative two-level system
• Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits
• Transition from weak to strong measurements by nonlinear quantum feedback control
• Period-doubling-bifurcation readout for a Josephson qubit
• The Heisenberg limit for laser coherence
• Superconducting-semiconductor quantum devices: from qubits to particle detectors
• Andreev Probe of Persistent Current States in Superconducting Quantum Circuits
• Quantum nondemolition-like, fast measurement scheme for a superconducting qubit
• Impedance measurement technique for quantum systems
• Three qubit Grover's algorithm using superconducting quantum interference devices in cavity QED
• Phase-space theory for dispersive detectors of superconducting qubits
• Phase sensitive amplification in a superconducting stripline resonator integrated with a dc-SQUID
• Superconducting phase qubit based on the Josephson oscillator with strong anharmonicity
• Vibronic spectroscopy of an artificial molecule
• Flux Qubit in Charge-Phase Regime
• Dispersive readout scheme for a Josephson phase qubit
• Readout for Phase Qubits without Josephson Junctions
• Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits
• Quantum teleportation between nanomechanical modes
• Crossover from weak to strong coupling regime in dispersive circuit QED
• Resonant Readout of a Persistent Current Qubit
• Dissipative dynamics of a qubit coupled to a nonlinear oscillator
• Mesoscopic Shelving Readout of Superconducting Qubits in Circuit QED
• Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process
• Efficient creation of multipartite entanglement in flux qubits
• Quantum Down Conversion and Multipartite Entanglement via a Mesoscopic SQUID Ring
• Anomalous decoherence and absence of thermalization in a photonic many-body system
• Qubit state detection using the quantum Duffing oscillator
• Quantum chaos in the mesoscopic device for the Josephson flux qubit
• Power-dependent internal loss in Josephson bifurcation amplifiers
• Quantum non-demolition measurement of microwave photons using engineered quadratic interactions
• Quantum Phase Dynamics in an LC shunted Josephson Junction
• Control of transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator
• Transitional dynamics of a phase qubit-resonator system: requirements for fast readout of a phase qubit
• Influence of External Fields and Environment on the Dynamics of Phase Qubit-Resonator System
• Nuclear magnetic resonance spectroscopy with a superconducting flux qubit
• Metastability in a nano-bridge based hysteretic DC-SQUID embedded in superconducting microwave resonator
• Flux Qubit Readout in the Persistent Current Basis at arbitrary Bias Points
• Quantum gambling using mesoscopic ring qubits
• Assessing the quantumness of the annealing dynamics via Leggett Gargs inequalities: a weak measurement approach
• Quantum computation and hidden variables
• Characterization and generation of a SQL-beating catlike state through repetitive measurements
• Readout of superconducting flux qubit state with a Cooper pair box