Protocol for high fidelity readout in the photon blockade regime of circuit QED

Abstract

The driven-damped Jaynes-Cummings model in the regime of strong coupling is found to exhibit a coexistence between the quantum photon blockaded state and a quasi-coherent bright state. We characterize the slow time scales and the basin of attraction of these metastable states using full quantum simulations. This form of bistability can be useful for implementing a qubit readout scheme that does not require additional circuit elements. We propose a coherent control sequence that makes use of a simple linear chirp of drive amplitude and frequency as well as qubit frequency. By optimizing the parameters of the system and the control pulse we demonstrate theoretically very high readout fidelities (>98%) and high contrast, with experimentally realistic parameters for qubits implemented in the circuit QED architecture.

arXiv comment4 pages, 4 figures.

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Cited by in corpus (17)

• Two-Photon Transport in a Waveguide Coupled to a Cavity with a Two-level System
• Observation of the photon-blockade breakdown phase transition
• Robust manipulation of superconducting qubits in the presence of fluctuations
• Lifetime renormalization of driven weakly anharmonic superconducting qubits: II. The readout problem
• Microwave Boson Sampling
• Critical slowing down in the bistable regime of circuit quantum electrodynamics
• Simultaneous bistability of qubit and resonator in circuit quantum electrodynamics
• Optimal control of two qubits via a single cavity drive in circuit quantum electrodynamics
• Quantum State Sensitivity of an Autoresonant Superconducting Circuit
• Single-atom maser with engineered circuit for population inversion
• Quantum phase transitions in the driven dissipative Jaynes-Cummings oscillator: from the dispersive regime to resonance
• Deterministic amplification of Schroedinger cat states in circuit quantum electrodynamics
• Minimal Time Robust Control for Two Superconducting Qubits
• A Real-time Instanton Approach to Quantum Activation
• Quantum jumps in amplitude bistability: Tracking a coherent and invertible state localization
• Model Order Reduction for Open Quantum Systems Based on Measurement-adapted Time-coarse Graining
• Photon statistics on the extreme entanglement