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.

  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


These links to content published by NPG are automatically generated.


Optical quantum information The quantum information cocoon

Nature Photonics News and Views (01 Aug 2008)

Quantum information Spooky teleportation

Nature Physics News and Views (01 Oct 2006)