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Journal of Physics B Atomic Molecular and Optical Physics

Repeat-until-success entanglement of distant atoms via single photon interference

Chun-Hua Yuan, Ka-Di Zhu

Published Feb 6, 2007• 4 citations
Publisher

Abstract

We propose a scheme to generate the entangled state of two atoms trapped in spatially separated cavities via single photon interference. With the use of automatic feedback, entanglement generation can be repeated until success is achieved.
DOI
10.1088/0953-4075/40/4/014

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A robust and scalable scheme for generating atom–photon and atom–atom entangled W states is proposed by using the interference effect of the polarized photons leaking out of the spatially separated cavities. Each of the atoms is trapped separately in a remote optical cavity, and the possible spontaneous channels induced by the excited atoms lead to the coherent superposition between atoms and photon, which is an important step toward long-distance and long-range quantum networking with individual atoms. The scalability is ensured in the sense that an arbitrarily large multiqubit atom–photon and atom–atom entangled W state can be generated with certain success probabilities.
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A scheme is presented for generation of entangled states for two atoms trapped in two distant bad cavities. The scheme can work with bad cavities with the coupling strength smaller than the cavity decay rate, which is important from the viewpoint of experiment. In the scheme the atoms have no probability of being populated in the excited state and thus the atomic spontaneous emission is suppressed, which increases the probability of success. The fidelity of the entangled state is not affected by the detection efficiency. Furthermore, the scheme does not require the detection of the left-polarized photon and right-polarized photon at the same time.