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Chinese Journal of Quantum Electronics

Influence of the motion of atomic mass centre and field mode structure on the field entropy squeezing

Mao-Fa Fang

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

The influence of the motion of atomic mass centre, field mode structure and initial mean photon number on the field entropy squeezing is investigated by means of the theory of quantum information entropy. It is shown that the motion of atomic mass center leads to the periodic evolution of the field entropy squeezing and this period depends on the field mode structure parameter; an increase in field-mode structure parameter results in not only shortening of the evolution period of the field entropy squeezing but also prolonging of the squeezing time; the field may exhibit long time entropy squeezing effect for some choieed system parameters.

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The influence of the motion of atomic mass centre, field mode structure and initial mean photon number on the field entropy squeezing is investigated by means of the theory of quantum information entropy. It is shown that the motion of atomic mass center leads to the periodic evolution of the field entropy squeezing and this period depends on the field mode structure parameter; an increase in field-mode structure parameter results in not only shortening of the evolution period of the field entropy squeezing but also prolonging of the squeezing time; the field may exhibit long time entropy squeezing effect for some choieed system parameters.
The entropy evolution properties of field in the system of two-mode squeezing vacuum field interacting with the atomic motion are studied by means of quantum theory.The influences of atomic motion and the field structure in different initial states are discussed emphatically.The results show that the field entropy is determined by the velocity of the atomic motion and the parameter of the field mode structure through time parameter sin~2(epgt/2).The atomic motion and the parameter of the field mode structure lead to additional vibration entropy.
The information entropy squeezing properties of the atom in motion interacting with the two-mode squeezing vacuum field via two-photon transition are studied by means of quantum theory.The influences of the velocity of atomic motion,the field structure and the parameter of squeezing field on the information entropy squeezing properties of the atom are investigated as the initial atom is in any state.The results indicate that the value of squeezed component of the atomic dipole,squeezed frequency,amplitude and squeezed direction of the atomic information entropy can be controlled by choosing the atomic initial state,the velocity of atomic motion,the field structure and the squeezing factor of field and the squeezing phase angle of the field,respectively.In the longer time,squeezing effects of the atom in motion can be obtained by choosing the system parameters.The mixing degree of atomic initial state has no influence on the entropy squeezing of the atom in motion.
The field entropy evolution in a system which is composed of two moving entangled atoms interacting with the squeezed coherent state is studied by means of the full quantum theory.The influences of the coherent amplitude factor,the squeezing factor,the atomic motion and the field-model structure parameter on the field entropy are discussed.The result shows that the atomic motion leads to the periodic evolution of the field entropy.An increase of coherent amplitude factor weaken the degree of entanglement between the atoms and the light field.However,an increase of squeezing factor of light strengthen the degree of entanglement between the atoms and the light field.With increasing atomic speed or field-model structure parameter,the evolution period of the field entropy becomes shorter,and the degree of entanglement between field and moving atoms becomes smaller.
The information entropy squeezing properties of the atom in motion interacting with the binomial states field via single photon transition are studied by means of quantum theory.The influences of the parameter of light field on the information entropy squeezing properties of the atom are investigated as the initial atom is in any state.The results indicate that the value of squeezed component of the atomic dipole,amplitude,squeezed time and squeezed direction of the atomic information entropy can be controlled by choosing the atomic initial state,the field structure parameter,the velocity of atomic motion.It is shown that the moving atom may exhibit the long time squeezing effect for some parameters.
Under on-resonance condition and far-off-resonance condition, at first, we used the full quantum theory to educe the wave function of the system. Secondly, we utilized entropy theory, in virtue of the wave function, to discuss the effects of the initial mean photon number?the atomic motion and the field-mode structure on the evolution of the field(atom) entropy at length in the interaction of a three-level moving atom with field. The results show that the atomic motion leads to the periodic evolution of the field entropy, this periodicity does not depend on the statistical distribution and the intensity of the initial field mode, but depend on the atomic motion and the field-mode structure parameters ep. Both on-resonance condition and far-off-resonance condition, when making a suitable choice for parameter ep (this choice is experimentally possible),we can get pure field state for a long time.
The entropy evolution properties of field (atom) in a moving cascade three-level atom interacting with a single-mode field are studied through two photon transitions. When the atom is initially in coherent state, the influences of the atomic motion, the field-mode structure parameter and the initial average photon number on the evolution of the entropy are discussed. The results show that the entropy evolution period of the field is dependent of the atomic motion and the field-mode structure parameter. However, the parameter of the initial average photon number will neither lengthen nor shorten the entropy evolution period of the field, but the numerical values of maximum and sub-minimum of entropy will be affected by it.