Global stability criterion for a quantum feedback control process on a single qubit and exponential stability in case of perfect detection efficiency
Andreas de Vries · Physical Review A · 2007
Quantum feedback control is a technology that 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 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.