Catch-Disperse-Release Readout for Superconducting Qubits

Abstract

We analyze a single-shot readout for superconducting qubits via the controlled catch, dispersion, and release of a microwave field. A tunable coupler is used to decouple the microwave resonator from the transmission line during the dispersive qubit-resonator interaction, thus circumventing damping from the Purcell effect. We show that if the qubit frequency tuning is sufficiently adiabatic, a fast high-fidelity qubit readout is possible, even in the strongly nonlinear dispersive regime. Interestingly, the Jaynes-Cummings nonlinearity leads to the quadrature squeezing of the resonator field below the standard quantum limit, resulting in a significant decrease of the measurement error.

5 pages, 4 figures, published version

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Cited by in corpus (21)

• Circuit Quantum Electrodynamics
• Microwave photonics with superconducting quantum circuits
• Quantum theory of a bandpass Purcell filter for qubit readout
• Measurement-Induced State Transitions in a Superconducting Qubit: Within the Rotating Wave Approximation
• Purcell effect with microwave drive: Suppression of qubit relaxation rate
• Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers
• Optimal dispersive readout of a spin qubit with a microwave resonator
• Perfect squeezing by damping modulation in circuit quantum electrodynamics
• Measuring a transmon qubit in circuit QED: dressed squeezed states
• Tunable-Cavity QED with Phase Qubits
• Robust quantum state transfer using tunable couplers
• Entanglement Generated by the Dispersive Interaction: The Dressed Coherent State
• Coherent Feedback Improved Qubit Initialization in the Dispersive Regime
• The scattering coefficients of superconducting microwave resonators: I. Transfer-matrix approach
• Sequential dispersive measurement of a superconducting qubit
• Counting statistics of microwave photons in circuit QED
• Measurement-induced state transitions in dispersive qubit readout schemes
• Protection of a qubit with a subradiance effect: Josephson quantum filter
• Hybrid phase-space--Fock-space approach to evolution of a driven nonlinear resonator
• Towards a heralded eigenstate preserving measurement of multi-qubit parity in circuit QED
• Two-time correlators for propagating squeezed microwave in transients