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Nonclassicality Invariant of General Two-Mode Gaussian States.


ABSTRACT: We introduce a new quantity for describing nonclassicality of an arbitrary optical two-mode Gaussian state which remains invariant under any global photon-number preserving unitary transformation of the covariance matrix of the state. The invariant naturally splits into an entanglement monotone and local-nonclassicality quantifiers applied to the reduced states. This shows how entanglement can be converted into local squeezing and vice versa. Twin beams and their transformations at a beam splitter are analyzed as an example providing squeezed light. An extension of this approach to pure three-mode Gaussian states is given.

SUBMITTER: Arkhipov II 

PROVIDER: S-EPMC4876421 | BioStudies | 2016-01-01

SECONDARY ACCESSION(S): 10.1038/srep26523

REPOSITORIES: biostudies

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