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Efficient nonlocal two-step entanglement concentration protocol for three-level atoms in an arbitrary less-entangledW state using cavity input-output process

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Abstract

We present an efficient two-step entanglement concentration protocol (ECP) for three-level atoms trapped in one-sided optical micro-cavities in an arbitrary three-particle less-entangled W state, using the coherent state input-output process in low-Q cavity quantum electrodynamics system. In each step of the new proposed protocol, one of the three remote users prepares the auxiliary coherent optical pulses to perform cavity input-output process and then utilizes the standard homodyne measurement to discriminate the final outgoing coherent states. When both of the two steps are successful, remote parties can deterministically concentrate the less-entangled W state atoms to a standard maximally entangled W state. Compared with previous ECPs for W state, this protocol has some advantages and can be widely used in current quantum repeater and some quantum information processing tasks.

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Authors and Affiliations

  1. Department of Communications & Information Engineering, Century College, Beijing University of Posts and Telecommunications, Beijing, 102613, China

    Ru Zhang & SuHua Zhou

  2. School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Ru Zhang & Cong Cao

  3. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Ru Zhang & Cong Cao

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  1. Ru Zhang
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  2. SuHua Zhou
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  3. Cong Cao
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Correspondence to Ru Zhang.

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Zhang, R., Zhou, S. & Cao, C. Efficient nonlocal two-step entanglement concentration protocol for three-level atoms in an arbitrary less-entangledW state using cavity input-output process. Sci. China Phys. Mech. Astron. 57, 1511–1518 (2014). https://doi.org/10.1007/s11433-013-5308-x

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