A scheme for generating sub-Poisson light in a negative feedback and cascade three-level system is proposed in this paper. By using Langevin quantum theory, it is shown that there is a partial correlation between the ...A scheme for generating sub-Poisson light in a negative feedback and cascade three-level system is proposed in this paper. By using Langevin quantum theory, it is shown that there is a partial correlation between the two output light beams, one of which is fed back to control pump source so that the pump noise may be suppressed. When the pump noise is perfectly suppressed, the photon noise level of the internal field is 50% below the standard quantum limit (SQL), but the reduction of the output photon noise is related with the atomic number N. When N is very large, the output noise level is SQL. When N is very small, the sub-Poisson light can be produced within the cavity bandwidth in the external field, and the fluctuation of output photon flow approaches zero when N approaches 1. The conclusion in this paper is of generality.展开更多
Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadr...Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadrature component, is one type of the pure quantum-mechanical states of the radiation field. The state has been extensively studied because of its potential applications in optical communications and weak signal detections since it was introduced by Stoler in 1970.展开更多
Using the quantum electrodynamical theory the photon statistics has been established for a single-mode laser. A general master equation is advanced and, on the basis of the steadystate photon-number distribution, the ...Using the quantum electrodynamical theory the photon statistics has been established for a single-mode laser. A general master equation is advanced and, on the basis of the steadystate photon-number distribution, the variation of the Mandel factor with the relative pumping parameter is calculated. Our results show thai photon statistics for a single-mode laser have a novel feature, i.e. the photon-number distribution alternates, in general, between superPoisson distribution and sub-Poisson distribution, and approaches the usual Poisson distribution when the pumping parameter tends to infinite. The dependence of photon statistics on detuning, coupling coefficient, absorption coefficient, thermal mean photon-number and coupling time is discussed.展开更多
基金the National Natural Science Foundation of China
文摘A scheme for generating sub-Poisson light in a negative feedback and cascade three-level system is proposed in this paper. By using Langevin quantum theory, it is shown that there is a partial correlation between the two output light beams, one of which is fed back to control pump source so that the pump noise may be suppressed. When the pump noise is perfectly suppressed, the photon noise level of the internal field is 50% below the standard quantum limit (SQL), but the reduction of the output photon noise is related with the atomic number N. When N is very large, the output noise level is SQL. When N is very small, the sub-Poisson light can be produced within the cavity bandwidth in the external field, and the fluctuation of output photon flow approaches zero when N approaches 1. The conclusion in this paper is of generality.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadrature component, is one type of the pure quantum-mechanical states of the radiation field. The state has been extensively studied because of its potential applications in optical communications and weak signal detections since it was introduced by Stoler in 1970.
文摘Using the quantum electrodynamical theory the photon statistics has been established for a single-mode laser. A general master equation is advanced and, on the basis of the steadystate photon-number distribution, the variation of the Mandel factor with the relative pumping parameter is calculated. Our results show thai photon statistics for a single-mode laser have a novel feature, i.e. the photon-number distribution alternates, in general, between superPoisson distribution and sub-Poisson distribution, and approaches the usual Poisson distribution when the pumping parameter tends to infinite. The dependence of photon statistics on detuning, coupling coefficient, absorption coefficient, thermal mean photon-number and coupling time is discussed.
