Letter abstract


Nature Photonics 2, 488 - 491 (2008)
Published online: 11 July 2008 | doi:10.1038/nphoton.2008.130

Subject Categories: Quantum optics | Fibre optics and optical communications

Robust photonic entanglement distribution by state-independent encoding onto decoherence-free subspace

Takashi Yamamoto1,2, Kodai Hayashi1,2, S cedilahin Kaya Özdemir1,2,3, Masato Koashi1,2 & Nobuyuki Imoto1,2


Efficient and faithful implementation of quantum information tasks, such as quantum computing, quantum communication and quantum metrology1, 2, 3, requires robust and state-independent decoherence-suppressing measures to protect the quantum information carriers. Here we present an experimental demonstration of a robust distribution scheme in which one photon of an entangled photon pair is successfully encoded into and decoded from a decoherence-free subspace by a state-independent scheme. We achieved a high-fidelity distribution of the entangled state over a fibre communication channel, and also demonstrated that the scheme is robust against fragility of the reference frame. The scheme, thanks to its state-independence, is also applicable to the multipartite case where the photon to be distributed is entangled with many other photons. Such a robust and universal scheme for distributing quantum information in an indeterministic but conclusive manner will constitute an important building block of quantum communication and computing networks.

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  1. Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  2. CREST Research Team for Photonic Quantum Information, 4-1-8 Honmachi, Kawaguchi, Saitama 331-0012, Japan
  3. ERATO Nuclear Spin Electronics Project, Aramaki Aza Aoba, Sendai, Miyagi 980-0845, Japan

Correspondence to: Nobuyuki Imoto1,2 e-mail: imoto@mp.es.osaka-u.ac.jp



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