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Acta Physica Sinica

Optimum realization of the EPR paradox in the non-degenerate parametric amplification system

Chao Zhao, TAN WEI-HAN, 上海大学物理系,上海 200444

Published Jan 1, 2006• 2 citations
Publisher

Abstract

In this paper, we use the solution of the Fokker-Planck equation for non-degenerate parametric amplification to deduce the condition of demonstration of the EPR paradox. The numerical simulation shows that the optimum realization of EPR paradox can be achieved by adjusting the degree of squeezing, and this is the best condition for demonstrating the EPR paradox for a given finite loss k.

DOI
10.7498/aps.55.19

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In this paper, we use the solution of the Fokker-Planck equation for non-degenerate parametric amplification to deduce the condition of demonstration of the EPR paradox. The numerical simulation shows that the optimum realization of EPR paradox can be achieved by adjusting the degree of squeezing, and this is the best condition for demonstrating the EPR paradox for a given finite loss k.
In this paper, the solution of the time-dependent Fokker–Planck equation of non-degenerate optical parametric amplification is used to deduce the condition demonstrating the Einstein–Podolsky–Rosen (EPR) paradox. The analytics and numerical calculation show the influence of pump depletion on the error in the measurement of continuous variables. The optimum realization of EPR paradox can be achieved by adjusting the parameter of squeezing. This result is of practical importance when the realistic experimental conditions are taken into consideration.
In this paper, we first find out the analytic solution of the time-dependent Fokker-Planck equation of the non-degenerate optical parametric amplification (NOPA) system under the consideration of the dispersion, the loss and the pump depletion effects. Then, through the numerical calculation, we obtain the squeezing characteristic of the degenerate optical parametric amplification (DOPA) system with dispersion. the research indicates: the dispersion effect stems from the nonlinear susceptibility change from χ″ toχ″/{1+σ2/}/+2, with the increasing of the dispersion effect, the general feature of the squeezing curves beeps unchanged, and the curves contract toward left. The maximum squeezing approaches to the linear theory 1/(1+μ). Finally, we obtain the entanglement characteristic of the NOPA system with dispersion. We find out when σ is given, with the increasing of pump parameter μ, he corresponding phase makes a large change. The nonlinear susceptibility changes many times. When the polarity is positive, the system obtains the gain, when the polarity is negative, the system suffers the loss, but the gain is mainly dissipated by the loss, so the net gain is small, the squeezing is also small. The minimum variance V1 reduces gradually, and the whole curve moves to the right, approaches to the linear theory 1/(1+μ).
Over the past three decades, numerous demonstrations of the violation of Bell’s inequalities have been reported in optical experiments based upon observations of polarization correlations for photon pairs. Without exception, these measurements as well as those in other systems have involved discrete variables for which the Bell inequalities are applicable. By contrast, an experiment to demonstrate the original proposal by Einstein, Podolsky, and Rosen (EPR)1 for a system of observables with a continuous spectrum has not previously been realized. From many possible theoretical avenues, we have followed the suggestion of Reid and Drummond2 to achieve a demonstration of the EPR paradox for continuous variables by employing a subthreshold optical parametric oscillator (OPO) operated in a frequency-degenerate but polarization-nondegenerate mode.