26 January 2009 Physical and architectural considerations in quantum repeaters
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Quantum repeaters enable us to distribute entanglement between remote parties by relying on a network of quantum memory units that exhibit efficient coupling to light, scalability, and long coherence times. Entanglement is initially distributed between nearest neighbors and then extended to the far-end nodes using entanglement swapping techniques. For real-time applications, such as quantum key distribution, the above tasks must be repeated successively, according to a proper protocol, to generate entangled states at a certain rate. This paper studies a number of such protocols and the interplay between the rate of entanglement generation, the number of employed memories, and the coherence time of memory units.
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M. Razavi, K. Thompson, H. Farmanbar, Ma. Piani, N. Lütkenhaus, "Physical and architectural considerations in quantum repeaters", Proc. SPIE 7236, Quantum Communications Realized II, 723603 (26 January 2009); doi: 10.1117/12.811880; https://doi.org/10.1117/12.811880


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