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International Journal of Modern Physics B

BIEXCITON k th POWER AMPLITUDE SQUEEZING DUE TO OPTICAL EXCITON–BIEXCITON CONVERSION

Vo Tinh, Nguyen Ba An

Published Mar 30, 2000• 1 citation
Publisher

Abstract

We extend a previous paper on biexciton normal squeezing to the case of k th power amplitude squeezing in a quantum interacting system of photons, excitons and biexcitons. We find that the k th power amplitude squeezing depends on the characteristics of the initial coherent biexciton while the normal squeezing does not. Both the direction of maximal squeezing and the squeezing degree are derived as explicit functions of k. Especially, the squeezing degree always decreases with increasing k regardless of the initial conditions. All these properties are examined numerically.

DOI
10.1142/s0217979200000716

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We extend a previous paper on biexciton normal squeezing to the case of k th power amplitude squeezing in a quantum interacting system of photons, excitons and biexcitons. We find that the k th power amplitude squeezing depends on the characteristics of the initial coherent biexciton while the normal squeezing does not. Both the direction of maximal squeezing and the squeezing degree are derived as explicit functions of k. Especially, the squeezing degree always decreases with increasing k regardless of the initial conditions. All these properties are examined numerically.
Exact time-evolution is analytically derived from a coherent photon-exciton system subjected to a monochromatic radiation field resonant with the exciton-biexciton transition. It is shown that biexcitons, which appear under the resonant pumping, might periodically behave as squeezed quasiparticles, if photons or/and excitons are initially in squeezed states. The squeezing degree of the initial photons or/and excitons, the pumping intensity and the off-resonance detuning are demonstrated to govern the transfer of squeezing from the photon-exciton system to the biexciton.
Squeezing properties of two-mode excitons in a system of two coupled quantum dots and cavity QED is investigated.The effect of the different initial cavity field states on two-mode excitons normal squeezing and sum squeezing has been discussed.A conclusion has also been obtained through calculating.It is that when the cavity field is initial prepared in coherent states,two-mode excitons normal squeezing do not exist as well as the sum squeezing.It indicates that the two quadrature components of the excitons amplitude possess the same quantum fluctuation.However,in the case that cavity field is in the vacuum squeezed state,no matter how normal squeezing or sum squeezing,either of the two quadrature component of the excitons amplitude are always of squeezing,it implies that quantum noise can be effective restrained in the case.Otherwise,the maximum squeezing in both situations is determined by the initial cavity field squeezing factor r.After comparing normal squeezing and sum squeezing,we can find that two-mode excitons normal squeezing is larger than sum squeezing.