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Acta Physica Sinica

TRANSFERENCE OF A KIND OF NONCLASSICAL PROPERTIES BETWEEN TWO INTERACTING MODES OF LIGHT

Jian Bo Fu, GAO XIAO-CHUN, Jing‐Bo Xu, ZOU XU-BO, 浙江大学浙江近代物理中心和浙江大学物理系，杭州 310027

Published Jan 1, 1998• 2 citations
Publisher

Abstract

The invariant-related unitary transformation method is used to study the transference of a kind of nonclassical properties between two interacting modes of light.With the aid of numerical computation,it is interesting to find that the mutual conversion of the Fock states (being nonclassical) and the coherent states is attained when the interaction is chosen appropriately.

DOI
10.7498/aps.47.606

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The invariant-related unitary transformation method is used to study the transference of a kind of nonclassical properties between two interacting modes of light.With the aid of numerical computation,it is interesting to find that the mutual conversion of the Fock states (being nonclassical) and the coherent states is attained when the interaction is chosen appropriately.
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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.