One-shot entanglement generation over long distances in noisy quantum networks

Author(s): S. Perseguers, L. Jiang, N. Schuch, F. Verstraete, J. I. Cirac, K. G. H. Vollbrecht

Journal: Phys. Rev. A

Volume: 78

Page(s): 062324

Year: 2008

DOI Number: 10.1103/PhysRevA.78.062324

Link: Link to publication


We consider the problem of creating a long-distance entangled state between two stations of a network, where neighboring nodes are connected by noisy quantum channels. We show that any two stations can share an entangled pair if the effective probability for the quantum errors is below a certain threshold, which is achieved by a local encoding of the qubits and a global bit-flip correction. In contrast to the conventional quantum-repeater schemes, we do not need to store the qubits in quantum memory for a long time: our protocol is a one-shot process (i.e., the elementary entangled pairs are used only once) involving one-way classical communication. Furthermore, the overhead of local resources increases only logarithmically with the size of the network, making our proposal favorable to long-distance quantum communication.


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