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

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.022335· OSTI ID:21448482

Ginossar, E; Bishop, Lev S; Schuster, D I; Girvin, S M ^[1]

---

1. Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520 (United States)

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 quasicoherent 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.

• OSTI ID: 21448482
• Journal Information: Physical Review. A, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevA.82.022335; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
COMPUTERIZED SIMULATION
CONTROL
METASTABLE STATES
OPTIMIZATION
PHOTONS
PULSES
QUANTUM ELECTRODYNAMICS
QUANTUM STATES
QUBITS
BOSONS
ELECTRODYNAMICS
ELEMENTARY PARTICLES
ENERGY LEVELS
EXCITED STATES
FIELD THEORIES
INFORMATION
MASSLESS PARTICLES
QUANTUM FIELD THEORY
QUANTUM INFORMATION
SIMULATION