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Science Technology and Engineering

Entanglement between Double Single-mode Cavity Fields

Wei Jin

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

An two-level atom is considered passes through double spatially separated single-mode cavity fields and the influence of the center-of-mass motion of the atom is investigated,the length of the cavity and the separation between two cavities on entanglement between the cavity fields because of interaction between the atom and the cavity fields.It is found that in the case of ultra-cold atom,when k / k0 1,the probility that the atom passes through double cavity fields is small,and the entanglement is generated is small too.And when k / k0 1,the result is contraty.

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An two-level atom is considered passes through double spatially separated single-mode cavity fields and the influence of the center-of-mass motion of the atom is investigated,the length of the cavity and the separation between two cavities on entanglement between the cavity fields because of interaction between the atom and the cavity fields.It is found that in the case of ultra-cold atom,when k / k0 1,the probility that the atom passes through double cavity fields is small,and the entanglement is generated is small too.And when k / k0 1,the result is contraty.
A two-level atom passing through double spatially separated single-mode cavity fields is studied. We investigate the effecting factors of photon emission probabilities of the atom, which include the kinetic energy of the atom, the length of the cavity and the separation between the two cavities. The results show that in the case of ultra-cold atom, when the kinetic energy of the atom is small (k/k0k/k0>1), the length of the cavity has great effect on the photon emission probabilities. The present work shows that the photon emission probabilities may be modulated by controlling the center-of-mass motion of the atom.
We consider that an ultracold two-level atom passes through multi spatially separated single-mode cavity fields and investigate the influence of the center-of-mass motion of the atom, the length of the cavity and the separation between two cavities on the transmission and photon emission probabilities of the atom. We find that both the transmission and photon emission probabilities as functions of the cavity length have multi-resonance peaks when the separation between two cavities is equal to an integer multiple of half the de Broglie wavelength of the atomic center-of-mass motion. The present work shows that the wave function of the atomic center-of-mass motion may be modulated in a macroscopic level by arranging the cavities.
In this paper, we have investigated the entanglement between two dipole coupled two-level atoms. The model, in which only one atom is trapped in an lossless cavity and interacts with single-mode thermal field, and the other one can be spatially moved freely outside the cavity has been carried out. We have considered the effect of the atomic coherence on the entanglement behavior. We have shown that a thermal field might cause high entanglement between the atoms both for coherent and incoherent initial atomic states only for small values of the cavity mean photon number. In the considered model the atoms would get entangled even when both atoms are initially in the excited state. We have also derived that the degree of entanglement is weakly dependent on the strength of dipole-dipole interaction for coherent initial states.
We consider the situation that an ultracold two-level atom passes through three spatially separated single-model cavity fields,among which the middle cavity originally contains photons,and investigate how the photon emission probabilities is influenced by the length of the cavity,the separation between two cavities and photons in the cavity on photon emission probabilities of the atom.We find that photon emission probabilities do not change periodically as a function of the cavity length as usual when the middle cavity originally contains photons.Moreover,the principal of photon emission has been changed because of photons in cavity,which transformes from spontaneous radiation to the coexistence of spontaneous radiation and stimulated radiation.
In this paper we consider the case that three identical two-level atoms are trapped in a single-mode cavity which is in a weak coherent state initially, and there is an interaction between two atoms. The tripartite entanglement dynamics among atoms is studied. The influences of atom-atom coupling constant and intensity of the cavity field on the tripartite entanglement among atoms are discussed. The results obtained using the numerical method show that the tripartite entanglement among atoms is strengthened with the increase of intensity of the cavity field; on the other hand, it is weakened with the increase of the coupling constant between atoms.
We have investigated the entanglement between two dipole coupled two-level artificial atoms (superconducting qubits, ion, spins etc.). The model, in which only one atom is trapped in an lossless cavity and interacts with single-mode thermal field, and the other one can be spatially moved freely outside the cavity has been carried out. We have considered the effect of the atomic coherence on the entanglement behavior. We have shown that a thermal field might cause high entanglement between the atoms both for coherent and incoherent initial atomic states only for small values of cavity mean photon number. We have also derived that the degree of entanglement is weakly dependent on the strength of dipole-dipole interaction for coherent initial states. In the considered model the atoms would get entangled even when both atoms are initially in the excited state.