Journal
NATURE PHOTONICS
Volume 2, Issue 8, Pages 488-491Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nphoton.2008.130
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Funding
- Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research(C) [20540389]
- Ministry of Education, Culture, Sports, Science and Technology-Japan (MEXT) Grant-in-Aid for Young scientists(B) [20740232]
- Grants-in-Aid for Scientific Research [20740232] Funding Source: KAKEN
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Efficient and faithful implementation of quantum information tasks, such as quantum computing, quantum communication and quantum metrology(1-3), 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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