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Journal of the Optical Society of America B

Preparation of a class of multiatom entangled states

Yan Xia, Jie Song, Ai‐Dong Zhu, Zhe Hu Jin, Shou Zhang, He‐Shan Song

Published Jul 16, 2009• 6 citations
Publisher

Abstract

We propose a protocol to generate a class of entangled states of N′Λ-type three-level atoms trapped in distant cavities by using interference of polarized photons. The proposed setup involves simple linear optical elements, cavities, and the conventional photon detectors that only distinguish the vacuum and the nonvacuum Fock number states.

DOI
10.1364/josab.26.001599

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•Jun 21, 2004•0 citations
We propose a protocol to generate a class of entangled states of N′Λ-type three-level atoms trapped in distant cavities by using interference of polarized photons. The proposed setup involves simple linear optical elements, cavities, and the conventional photon detectors that only distinguish the vacuum and the nonvacuum Fock number states.
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We suggest two schemes to generate the W state of N Λ-type three-level atoms. In the schemes, identical N three-level atoms are trapped in a cavity or N distant cavities. The success or failure of the generation of the W state can be determined by detecting the polarization of photon leaking out of the cavity. The result demonstrates that the W state is free from both the cavity loss and the spontaneous emission due to the fact that the two ground states (left and right) of the three-level atoms are stable states (or metastable states).
A scheme to generate the entanglement between two distant atoms by the interference of polarized photons is proposed. The model consists of two identical /spl Lambda/-type three-level atoms trapped in two distant optical cavities respectively. Each atom has a excited state |e> and two degenerate ground states |g/sub L/> and |g/sub R/>. The scheme is based on the interference effect where the coherent superposition of atomic states is generated in photon emission process. The scheme gives several advantages: (i) both atoms are excited simultaneously; (ii) the driving condition does not influence the fidelity of the final entangled states; and (iii) the influence of atomic recoil on the entanglement fidelity could be eliminated.