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Acta Physica Sinica

HIGHER ORDER FLUCTUATIONS IN COHERENT STATES AND SQUEEZED STATES WITH THERMAL NOISE

H. Huan

Published Jan 1, 1998• 0 citations
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Abstract

Abstract By making use of thermo field dynamics(TFD),higher order fluctuations and higher order squeezing of quadrature components for coherent states and squeezed states with thermal noise have been studied.The higher order fluctuations of the phase for these thermalized states have been investigated using the concept of measured phase operators.Thus the dependence of the lower and higher order fluctuations and squeezing on temperature in these states at finite temperature can be seen.It is significant to discuss the effect of temperature on the fluctuations and squeezing,since the states of real field are always at finite temperatures.

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HIGHER-ORDER FLUCTUATIONS IN COHERENT STATES AND SQUEEZED STATES WITH THERMAL NOISE

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Acta Physica Sinica•Jan 1, 2001•1 citation
Abstract By making use of thermo field dynamics(TFD),higher order fluctuations and higher order squeezing of quadrature components for coherent states and squeezed states with thermal noise have been studied.The higher order fluctuations of the phase for these thermalized states have been investigated using the concept of measured phase operators.Thus the dependence of the lower and higher order fluctuations and squeezing on temperature in these states at finite temperature can be seen.It is significant to discuss the effect of temperature on the fluctuations and squeezing,since the states of real field are always at finite temperatures.
By making use of thermo-field dynamics(TFD),higher-order fluctuations and higher-order squeezing of quadrature components for coherent states and squeezed states with thermal noise have been studied.The higher-order fluctuations of the phase for these thermalized states have been investigated using the concept of measured phase operators.Thus the dependence of the lower-and higher-order fluctuations and squeezing on temperature in these states at finite temperature can be seen.It is significant to discuss the effect of temperature on the fluctuations and squeezing,since the states of real field are always at finite temperatures.
The second-,fourth-and sixth-order fluctuations have been discussed by making use of- SU-(2)Lie algebra.On the basis of higher-order uncertainty relation,the definition of higher-order squeezing for the fluctuations of angular momentum has been put forward.In particular,the second-,fourth-and sixth-order squeezing in atomic coherent states are investigated.These methods and definition can be used for studying much higher-order squeezing.The higher-order squeezing can be generalized to the fluctuations of atomic variances thereby.