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Journal of Zhejiang Normal University

Antibunching effect of the field in the system of two-mode entangled coherent states interacting with a Λ-type three-level atom

Qiu Chang-dong

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

The antibunching effect of the field in the system of two-mode entangled coherent states interacting with a Λ-type three-level atom was investigated by means of numerical calculation.The influences of the degree of entanglement of two Λ-mode entangled coherent state optics field and mean photon numbers of two-mode optics field on antibunching effect were discussed.The results showed that antibunching effect strengthening with increasing of the the degree of entanglement of two-mode entangled coherent state optics field and weakening with increasing of mean photon numbers of two-mode entangled coherent state optics field.

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The antibunching effect of the field in the system of two-mode entangled coherent states interacting with a Λ-type three-level atom was investigated by means of numerical calculation.The influences of the degree of entanglement of two Λ-mode entangled coherent state optics field and mean photon numbers of two-mode optics field on antibunching effect were discussed.The results showed that antibunching effect strengthening with increasing of the the degree of entanglement of two-mode entangled coherent state optics field and weakening with increasing of mean photon numbers of two-mode entangled coherent state optics field.
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By means of numerical calculations,the dipole squeezing of a Λ-type three-level atom interacting with two-mode entangled coherent states is investigated.The influences of the degree of entanglement of two-mode entangled coherent optics field and mean photon numbers of two-mode optics field on dipole squeezing of a Λ-type three-level atom are discussed.The results show that squeezing effect weakens with increase of degree of entanglement of two-mode entangled coherent optics field and with increasing of mean photon numbers of two-mode entangled coherent optics field.
Considering two Λ-type three-level atoms initially in the entangled state, one atom is poured into the cavity and interacts with a two-mode cavity. The squeezing and antibunching effects of the field are investigated. The influences of the selective atomic measurement and the intensity of the coherent field, which interacts with atom on squeezing and antibunching effect of the field, are discussed. The results obtained by numerical calculations show that squeezing and antibunching effect of the field can be strengthened through selective atomic measurement for atom outside of the cavity.
By means of solving Schrdinger equation and numerical calculations,photon bunching and antibunching effect in the system of the two-mode entangled coherent states interacting with a moving V-type three-level atom is investigated.The results indicate that the effect of photon bunching and antibunching in the system intensively depend on mean photon numbers of the two-mode entangled coherent states and the speed of the atom.For a special mean photon number,the velocity of atom will afftect the effect of photon bunching and antibunching intensively.For those relatively large mean photon numbers,the initial state of the atom and the degree of entanglement of the two-mode entangled coherent states have no influences on the effect of photon bunching and antibunching.For those relatively small mean photon numbers,the initial state of the atom and the degree of entanglement of the two-mode entangled coherent states only have slight influences on the effect of photon bunching and antibunching.
The statistic properties of photon in the system of a two-mode entangled coherent state interacting with a Ξ-type three-level atom are investigated by solving Schrdinger equation and using numerical calculations. The effects on the statistic properties of photon induced by the degree of entanglement of the two-mode entangled coherent state, the ground state probability amplitude of the atomic initial state, the detuning, the atom-field coupling constant and the mean photon number are analyzed. The results indicate that the influence of the degree of entanglement of the two-mode entangled coherent state on the statistic properties of photon is small. The increasing of the ground state probability amplitude of the atomic initial state causes the center of the time evolution curve to move up distinctly. The increasing of the detuning results in the decrease of the oscillating frequency of the time evolution curve. The influences of the atom-field coupling constant and the mean photon number on the statistic properties of photon are noticeable. The correlation of the two modes of light is non-classical all the time.