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International Journal of Modern Physics B

NONCLASSICAL STATES EVOLVING FROM CLASSICAL STATES IN A POLARITON SYSTEM AT LOW TEMPERATURE

Jian Zou, Bin Shao

Published Jul 20, 1999• 3 citations
Publisher

Abstract

We show that the photon quadrature squeezing, the phonon quadrature squeezing and the polariton quadrature squeezing can exist in a model polariton system at low temperature with the photons and the phonons initially being prepared in the coherent states and the thermal states respectively and the distributions of the photons, the phonons and the polaritons can be sub-Poissonian. We also show that all these effects strongly depend on the temperature.

DOI
10.1142/s0217979299002460

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We show that the photon quadrature squeezing, the phonon quadrature squeezing and the polariton quadrature squeezing can exist in a model polariton system at low temperature with the photons and the phonons initially being prepared in the coherent states and the thermal states respectively and the distributions of the photons, the phonons and the polaritons can be sub-Poissonian. We also show that all these effects strongly depend on the temperature.
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Quantum statistical properties are derived for stimulated Raman scattering by squeezed phonons including squeezing of vacuum fluctuations in radiation modes and sub-Poisson photon behaviour.Initial radiation can be in squeezed thermalized and/or sub-Poisson states, phonon system can also be squeezed.In particular, effects of initial phase conditions, losses, initial nonclassical behaviour and phonon squeezing are demonstrated in terms of reduced factorial moments up to the fifth order in combined photon-photon and photon-phonon modes.Also photon number distribution, quadrature variances and principał squeeze parameters are shown.
Squeezing the quantum fluctuations of the two-mode light due to the nonstationary coupling between the quadrature components q1{q}_{1}q1​ and q2{q}_{2}q2​ is examined. The \ensuremath{\delta}- and step-function mode couplings are considered. The conditions of weak and strong step-function coupling are distinguished, the latter being the condition of the instability for the classical counterpart of the quantum system under study. Under the conditions of weak coupling the quadrature squeezing is established in both a two-mode electromagnetic noise in thermal equilibrium (the thermal state) and a two-mode correlated coherent state (CCS). Squeezing in the thermal state is suppressed at a high temperature. The photon distribution function (PDF) in the thermal state reveals oscillatory behavior for both high and low temperature, the oscillations decrease while the temperature increases. The PDF in the CCS can be either oscillatory or smooth, whereas the photon statistics is essentially non-Poissonian. The nonclassical intermode photon-number correlations in the CCS are briefly studied.
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