Efficient decoherence-free entanglement distribution over lossy quantum channels |
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Authors: | Ikuta Rikizo Ono Yohei Tashima Toshiyuki Yamamoto Takashi Koashi Masato Imoto Nobuyuki |
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Affiliation: | Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. |
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Abstract: | 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. |
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