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Efficient and faithful implementation of quantum information tasks, e.g.,quantum computing, quantum communication and quantum metrology, requires robustand state-independent decoherence-suppressing measures to protect quantuminformation carriers. Here we present an experimental demonstration of a robustdistribution scheme in which one photon of an entangled photon pair issuccessfully encoded into and decoded from a decoherence-free subspace (DFS) bya state-independent scheme. We achieved a high-fidelity distribution of theentangled state over fibre communication channel, and also demonstrated thatthe scheme is robust against fragility of the reference frame. The scheme,thanks to its state-independence, is also applicable to multipartite case wherethe photon to be distributed is entangled with many other photons. Such auniversal scheme opens the possibility of robust distribution of quantuminformation among quantum communication and computing networks.

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