Quantum Bayesian approach to circuit QED measurement
Quantum Physics
2012-05-11 v1 Mesoscale and Nanoscale Physics
Abstract
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.
Cite
@article{arxiv.1111.4016,
title = {Quantum Bayesian approach to circuit QED measurement},
author = {Alexander N. Korotkov},
journal= {arXiv preprint arXiv:1111.4016},
year = {2012}
}
Comments
11 pages; Contribution to Proceedings of Les Houches summer school "Quantum Machines" (2011)