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

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

2010-04-25

arxiv.org/abs/1004.4385v1

Phys. Rev. A 82, 022335 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures.

Scientific paper

10.1103/PhysRevA.82.022335

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.

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