Unambiguous quantum state filtering

Details Unambiguous quantum state filtering Unambiguous quantum state filtering

2003-04-04

arxiv.org/abs/quant-ph/0304032v1

Phys. Rev. A 68, 012307 (2003)

Physics

Quantum Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevA.68.012307

In this paper, we consider the generalized measurement where one particular quantum signal is unambiguously extracted from a set of non-commutative quantum signals and the other signals are filtered out. Simple expressions for the maximum detection probability and its POVM are derived. We applyl such unambiguous quantum state filtering to evaluation of the sensing of decoherence channels. The bounds of the precision limit for a given quantum state of probes and possible device implementations are discussed.

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