Selective quantum evolution of a qubit state due to continuous measurement

作者：Alexander N. Korotkov · 发表于：Physical review. B, Condensed matter · 年份：2001 · DOI：10.1103/physrevb.63.115403 · 被引用次数：230 · 研究领域：Quantum Mechanics and Applications、Quantum Information and Cryptography、Quantum Computing Algorithms and Architecture

We consider a two-level quantum system (qubit) that is continuously measured by a detector. The information provided by the detector is taken into account to describe the evolution during a particular realization of the measurement process. We discuss the Bayesian formalism for such ``selective'' evolution of an individual qubit and apply it to several solid-state setups. In particular, we show how to suppress qubit decoherence using continuous measurement and a feedback loop.