Selective quantum evolution of a qubit state due to continuous measurement

Details Selective quantum evolution of a qubit state due to continuous measurement Selective quantum evolution of a qubit state due to continuous measurement

2000-08-31

arxiv.org/abs/cond-mat/0008461v2

Phys.Rev.B 63, 115403 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages (including 9 figures)

Scientific paper

10.1103/PhysRevB.63.115403

We consider a two-level quantum system (qubit) which 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 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 the qubit decoherence using continuous measurement and the feedback loop.

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