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Chinese Journal of Quantum Electronics

Influence of atomic coupling on bunching and anti-bunching effects of radiating light field

Xia Yun-Jie

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

The influence of the coupling strength between two atoms on bunching and anti-bunching effects of photons in the system that two atoms with two levels are interacted with a single-mode light field was studied. Numerical simulation results show that the influence of atomics coupling on bunching and anti-buriching effects is non-linear. But we can get anti-bunching light field for proper atomic coupling strength. And the explanation for the mechanism of the influence was given.

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The influence of the coupling strength between two atoms on bunching and anti-bunching effects of photons in the system that two atoms with two levels are interacted with a single-mode light field was studied. Numerical simulation results show that the influence of atomics coupling on bunching and anti-buriching effects is non-linear. But we can get anti-bunching light field for proper atomic coupling strength. And the explanation for the mechanism of the influence was given.
Using Tavis-Cummings model, the anti-bunching effect of the field in interaction of two coupling two-level atoms with coherent state light field through multiphoton transition was studied. The influences of coupling constants between atoms and intial mean photon number of field on anti-bunching effect of the field were discussed. The results obtained by the numerical method show that with increasing of intial mean photon number of field the anti-bunching effect of the field is getting stronger, and with increasing of coupling constant between atoms the anti-bunching effect of the field is getting weaker.
Anti-bunching effect of the light field in the system of a two-mode field initially in an SU(2) coherent state resonantly interacting with a three-level V-type atom are investigated by numerical calculations.The influences of the selective atomic measurement,the total photon of the tow-mode,the partition parameter,the coupling constant and the atomic initial state on the anti-bunching effect of the light field is discussed.The results indicate: the a mode anti-bunching effect is distinctly enhanced when the state-selective measurement is performed on the atom or the atom is initially on the lower level;the anti-bunching effect of the field does not change over time when the tow coupling constants are same and the direct state-selective measurement is performed on the atom;the anti-bunching effect of the two mode of the field is distinctly enhanced when the total photon number of the two-mode is decreased.
The statistic properties of photon of a light-atoms interaction system,and two atoms in Bell states interacting with two-mode entangled coherent field,were investigated by means of quantum theory and numerical method.The effect on the statistic properties of photon induced by the atomic initial state,mean photon numbers of field,the degree of the entanglement for the entangled coherent fields,and the coupling strength of dipole-dipole interaction between atoms were analyzed by numerical calculations.The results indicate that photon anti-bunching effect does not appear for the Bell state ｜β00〉 or ｜β10〉,however there can appear the photon anti-bunching effect under some conditions for the Bell state ｜β01〉 or ｜β11〉 appears.In the case,the photon anti-bunching effect depends on the mean photon numbers intensively.The influence of the degree of entanglement for the two-mode entangled coherent fields and the coupling strength of dipole-dipole interaction between atoms on the statistic properties of photon is small.
Anti-bunching effect of the field in the system of a two-mode field initially in an SU(2) coherent state resonantly interacting with a three-level Λ-type atom are investigated by means of quantum theory and nu-merical calculations.The dependence of the anti-bunching effect on the total photon of the tow-mode,the parti-tion parameter,the coupling constant and the atomic initial state is discussed for two cases:(1) no state-selective atomic measurement;(2) direct state-selective atomic measurement.The results indicate: the anti-bunching effect of the two mode of the field exhibits when the two coupling coefficients are the same;a mode anti-bunching ef-fect is distinctly enhanced when the atom is initially on the lower level or direct state-selective measurement is performed on the atom;the anti-bunching effect of the two mode of the field is distinctly enhanced when the to-tal photon number of the two-mode is decreased;the anti-bunching effect of the field does not change over time when the two coupling coefficients are the same and the state-selective measurement is performed on the atom.