Unambiguous quantum state filtering

Abstract

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.

7 pages, 5 figures

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• Unambiguous Discrimination Between Linearly-Independent Quantum States
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Cited by in corpus (5)

• Unambiguous discrimination among quantum operations
• Fundamental precision limit of a Mach-Zehnder interferometric sensor when one of the inputs is the vacuum
• Quantum Filtering of Optical Coherent States
• Condition and capability of quantum state separation
• Stochastic waveform estimation at the fundamental quantum limit