Concatenated Greenberger-Horne-Zeilinger (C-GHZ) state is a new type of logic-qubit entanglement, which has attracted a lot of attentions recently. We propose a protocol for concentrating the less-entangled C-GHZ state assisted with an auxiliary single logic qubit. In this protocol, by utilizing the quantum nondemolition detection (QND) constructed by cross-Kerr nonlinearities, we demonstrate that our protocol exhibits much higher success probability compared to conventional methods in linear optics. Moreover, the protocol requires less operations and classical communications. It may be useful in the implementation of long-distance quantum communication.
Entanglement Concentration for Concatenated Greenberger-Horne-Zeilinger State Assisted with Single Logic Qubit
2017-06-01
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Conference paper
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English
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