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Zhongguo Shiyou Daxue xuebao. Ziran kexue ban

STATISTICAL QUANTUM PROPERTIES OF EXCITONS IN A LEAKY CAVITY WITH QUASIMODES

Jiao Zhi

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

The quantum properties of the exciton in a leaky cavity with quasi modes were investigated. It is shown that there exists energy exchange between the exciton and cavity field when the cavity is initially in the vacuum state, and the exciton is initially in a superposition of the vacuum state and number state. The exciton and the cavity field may exhibit sub Poissonian distribution. The correlation between the exciton and the cavity is classical, which implies that there has no violation of the Cauchy Schwartz inequality.

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The quantum properties of the exciton in a leaky cavity with quasi modes were investigated. It is shown that there exists energy exchange between the exciton and cavity field when the cavity is initially in the vacuum state, and the exciton is initially in a superposition of the vacuum state and number state. The exciton and the cavity field may exhibit sub Poissonian distribution. The correlation between the exciton and the cavity is classical, which implies that there has no violation of the Cauchy Schwartz inequality.
We have studied quantum statistical properties of the exciton in a leaky quasi-mode cavity. It is shown that when the exciton is initially in a squeezed coherent state whereas cavity initially in a vacuum state, there is energy exchange between the exciton and cavity. Both the exciton and cavity may exhibit sub-Poissonian distribution and exist quadrature squeezing. Calculation shows that correlation between the exciton and cavity is classical, which implies that there is not the violation of the Cauchy–Schwartz inequality.
We have investigated quantum statistical behaviors of photons and atoms in interaction of an atomic Bose–Einstein condensate with quantized laser field. When the quantized laser field is initially prepared in a superposition state which exhibits holes in its photon-number distribution, while the atomic field is initially in a Fock state, it is found that there is energy exchange between photons and atoms. For the input and output states, the photons and atoms may exhibit the sub-Poissonian distribution. The input and output laser fields may exhibit quadrature squeezing, but for the atomic field, only the output state exhibits quadrature squeezing. It is shown that there exists the violation of the Cauchy–Schwartz inequality, which means that the correlation between photons and atoms is nonclassical.
We have investigated quantum statistical behaviors of photons and atoms in interaction of an atomic Bose Einstein condensate with quantized laser field. When the quantized laser field is initially prepared in a superposition state which exhibits holes in its photon-number distribution, while the atomic field is initially in a Fock state, it is found that there is energy exchange between photons and atoms. For the input and output states, the photons and atoms may exhibit the sub-Poissonian distribution. The input and output laser fields may exhibit quadrature squeezing, but for the atomic field, only the output state exhibits quadrature squeezing. It is shown that there exists the violation of the Cauchy-Schwartz inequality, which means that the correlation between photons and atoms is nonclassical.``
Quantum statistic properties of a two-mode field initially in a coherent state resonantly interacting with a three-level V-type atom are investigated by means of the quantum theory and numerical calculations.The dependence of the sub-Poisson statistics,the coherent properties of two-mode cavity field,photon bunching and anti-bunching,and the violations of Cauchy-Schwarz inequality on the average photon number of the cavity mode,the coupling constant and the interaction time is discussed in three cases:(1) no state-selective measurement on the atom;(2) direct state-selective measurement on the atom;(3) state-selective measurement on the atom after the application of a classical field.The results indicate,when the state-selective measurement is performed on the atom,the sub-Poisson statistic properties is distinctly enhanced,the anti-correlative degree between two-mode is distinctly deadened,and the Cauchy-Schwarz inequality is always violated;the mode a anti-bunching exhibits when the state-selective measurement is performed on the atom and the average photon number difference of the two cavity modes is large.
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.
We investigate the quantum decoherence of a mesoscopically superposed states of excitons in a quantum well placed within a leaky cavity. Based on the factorization theory of quantum dissipation, our investigation shows that the coherence of the superposed states of the excitons will decrease in an oscillating form when the cavity field is of the quasimode form. Regarding the effects of the thermal cavity fields on the quantum decoherence of the superposition states of the exciton, we observe that the higher the temperature of the environment, the shorter the decoherence characteristic time.