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

Takashi Yamamoto, Kodai Hayashi, Şahin Kaya Özdemir, Masato Koashi, Nobuyuki Imoto

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


Efficient and faithful implementation of quantum information tasks, such as quantum computing, quantum communication and quantum metrology, 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.

Original languageEnglish (US)
Pages (from-to)488-491
Number of pages4
JournalNature Photonics
Issue number8
StatePublished - Aug 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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