Efficient Decoherence-Free Entanglement Distribution over Lossy Quantum Channels
Abstract
We propose and demonstrate a scheme for boosting the efficiency of entanglement distribution based on a decoherence-free subspace over lossy quantum channels. By using backward propagation of a coherent light, our scheme achieves an entanglement-sharing rate that is proportional to the transmittance T of the quantum channel in spite of encoding qubits in multipartite systems for the decoherence-free subspace. We experimentally show that highly entangled states, which can violate the Clauser-Horne-Shimony-Holt inequality, are distributed at a rate proportional to T.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2011
- DOI:
- 10.1103/PhysRevLett.106.110503
- arXiv:
- arXiv:1012.5584
- Bibcode:
- 2011PhRvL.106k0503I
- Keywords:
-
- 03.67.Hk;
- 03.67.Pp;
- 42.50.Ex;
- Quantum communication;
- Quantum error correction and other methods for protection against decoherence;
- Optical implementations of quantum information processing and transfer;
- Quantum Physics
- E-Print:
- 5pages, 5figures