A computable measure of nonclassicality for light

Details A computable measure of nonclassicality for light A computable measure of nonclassicality for light

2004-11-22

arxiv.org/abs/quant-ph/0411164v1

Phys. Rev. Lett. 94, 173602 (2005)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.94.173602

We propose the Entanglement Potential (EP) as a measure of nonclassicality for quantum states of a single-mode electromagnetic field. It is the amount of two-mode entanglement that can be generated from the field using linear optics, auxiliary classical states and ideal photodetectors. The EP detects nonclassicality, has a direct physical interpretation, and can be computed efficiently. These three properties together make it stand out from previously proposed nonclassicality measures. We derive closed expressions for the EP of important classes of states and analyze as an example the degradation of nonclassicality in lossy channels.

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