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-other | 2016

REPOSITORIES: biostudies-other