Efficient decoherence-free entanglement distribution over lossy quantum channels

We propose and demonstrate a scheme for boosting the efficiency of entanglement distribution based on a decoherence-free subspace over lossy quantum channels. By using backward propagation of a coherent light, our scheme achieves an entanglement-sharing rate that is proportional to the transmittance...

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Bibliographic Details
Published in:Physical review letters 2011-03, Vol.106 (11), p.110503-110503, Article 110503
Main Authors: Ikuta, Rikizo, Ono, Yohei, Tashima, Toshiyuki, Yamamoto, Takashi, Koashi, Masato, Imoto, Nobuyuki
Format: Article
Language:English
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Summary:We propose and demonstrate a scheme for boosting the efficiency of entanglement distribution based on a decoherence-free subspace over lossy quantum channels. By using backward propagation of a coherent light, our scheme achieves an entanglement-sharing rate that is proportional to the transmittance T of the quantum channel in spite of encoding qubits in multipartite systems for the decoherence-free subspace. We experimentally show that highly entangled states, which can violate the Clauser-Horne-Shimony-Holt inequality, are distributed at a rate proportional to T.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.110503