Quantum Bayesian approach to circuit QED measurement

Details Quantum Bayesian approach to circuit QED measurement Quantum Bayesian approach to circuit QED measurement

2011-11-17

arxiv.org/abs/1111.4016v1

Physics

Quantum Physics

11 pages; Contribution to Proceedings of Les Houches summer school "Quantum Machines" (2011)

Scientific paper

We present a simple formalism describing evolution of a qubit in the process of its measurement in a circuit QED setup. When a phase-sensitive amplifier is used, the evolution depends on only one output quadrature, and the formalism is the same as for a broadband setup. When a phase-preserving amplifier is used, the qubit evolution depends on two output quadratures. In both cases a perfect monitoring of the qubit state and therefore a perfect quantum feedback is possible.

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