Global stability criterion for a quantum feedback control process on a single qubit and exponential stability in case of perfect detection efficiency

Details Global stability criterion for a quantum feedback control process on a single qubit and exponential stability in case of perfect detection efficiency Global stability criterion for a quantum feedback control process on a single qubit and exponential stability in case of perfect detection efficiency

2006-10-28

arxiv.org/abs/quant-ph/0610243v2

Physical Review A 75, 032101 (2007)

Physics

Quantum Physics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevA.75.032101

Quantum feedback control is a technology which can be used to drive a quantum system into a predetermined eigenstate. In this article, sufficient conditions for the experiment parameters of a quantum feedback control process of a homodyne QND measurement are given to guarantee feedback control of a spin-1/2 quantum system in case of imperfect detection efficiency. For the case of pure states and perfect detection efficiency, time scales of feedback control processes are calculated.

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