Open AccessHIGHER-ORDER FLUCTUATIONS IN COHERENT STATES AND SQUEEZED STATES WITH THERMAL NOISE
Author(s) -
Dong Chuan-Hua
Publication year - 1998
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.1989
Subject(s) - physics , coherent states , squeezed coherent state , thermal , thermal fluctuations , noise (video) , field (mathematics) , quantum fluctuation , quadrature (astronomy) , order (exchange) , phase (matter) , quantum mechanics , statistical physics , quantum electrodynamics , optics , quantum , thermodynamics , mathematics , finance , artificial intelligence , computer science , pure mathematics , economics , image (mathematics)
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.