Perfect quantumness and quantum-noise-free measurements

Details Perfect quantumness and quantum-noise-free measurements Perfect quantumness and quantum-noise-free measurements

2009-04-22

arxiv.org/abs/0904.3390v1

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

To quantify nonclassicality in an operational sense, we fix a positive semidefinite observable describing a given measurement setup and quantify the negativity of its normally ordered version. Perfect quantumness is defined via extension of the result to arbitrary quantum systems, and the route to quantum-noise-free measurements is outlined. As a surprising result, even moderately squeezed states may exhibit perfect quantumness. We propose an implementation of a quantum-noise-free measurement through moderate squeezing.

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