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Journal of Anhui Normal University

Influence of Entanglement Degree on the Light Field in the Nondegenerate Two-Photon Jaynes-Commings Model

Wu Jun

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

The paper mainly considers the interaction about one of the two entangled atoms with the nondegenerate two-photon in cavity.After selective detection on one of the atoms,the properties of the light field has been investigated.It is proved that the average photon numbers and the second-order quantum coherence are dramatically influenced by the entangled degree of the atoms.

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Optical Technique•Jan 1, 2011•0 citations
The paper mainly considers the interaction about one of the two entangled atoms with the nondegenerate two-photon in cavity.After selective detection on one of the atoms,the properties of the light field has been investigated.It is proved that the average photon numbers and the second-order quantum coherence are dramatically influenced by the entangled degree of the atoms.
Based on the model that one of the two-entangled two-level atoms interacts with the non-degeneration two-photon cavity filled with Kerr medium,the influence of the Kerr effect on the atom and the light is studied such as the average photon numbers,the degrees of second-order coherence and the Cauchy-Schwartz inequality.After selectively detection on one of the atoms at certain particular entanglement degree,it is found that the period of the collapse and revival of the average photon numbers,the degrees of second-order coherence of the lights,and the Cauchy-Schwartz inequality are influenced evidently by the Kerr effect.
Abstract The influence of the Kerr nonlinearity on the two two-level atoms entanglement is investigated in Jaynes–Cummings model (JCM), so that one of atoms is inside the cavity field and the other atom is outside it. We show that the entanglement of atoms increases with the decrease of the phase decoherence rate or Kerr coefficient, when considering the effect of external environment. Then due to the statistic properties of the anti-bunching effect of photons are related to entanglement, the nonlinear JCM is examined theoretically to analyze the bunching or anti-bunching effect by using the second-order coherence function. We find that the second-order coherence function decreases with the Kerr coefficient. Our results show that the field reflects the stronger bunching effect with the bigger average photon number.
Considering two two-level atoms initially in the entanglement state,one atom of two atoms is put into initially Fock state light cavity and has resonant interaction.The entanglement evolution between atom in cavity and light field is investigated.Negativity is used to quantify the degree of entanglement.Through comparing the results if direct selective measurement is performed or not,the influences of state-selective measurement of the atom outside the cavity on the entanglement properties of between atom inside cavity and field are discussed.The results obtained using the numerical method show that the entanglement between atom inside cavity and light field is strengthened through the state-selective measurement of the atom outside the cavity.