Quantum repeaters with imperfect memories: Cost and scalability
- 1 September 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 80 (3), 032301
- https://doi.org/10.1103/physreva.80.032301
Abstract
Memory dephasing and its impact on the rate of entanglement generation in quantum repeaters is addressed. For systems that rely on probabilistic schemes for entanglement distribution and connection, we estimate the maximum achievable rate per employed memory for our optimized partial nesting protocol, when a large number of memories are being used in each node. The above rate scales polynomially with distance, , if quantum memories with infinitely long coherence times are available or if we employ a fully fault-tolerant scheme. For memories with finite coherence times and no fault-tolerant protection, the above rate optimistically degrades exponentially in , regardless of the employed purification scheme. It decays, at best, exponentially in if no purification is used.
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This publication has 24 references indexed in Scilit:
- Robust and efficient quantum repeaters with atomic ensembles and linear opticsPhysical Review A, 2008
- Long-distance entanglement distribution with single-photon sourcesPhysical Review A, 2007
- Fast and robust approach to long-distance quantum communication with atomic ensemblesPhysical Review A, 2007
- Robust Creation of Entanglement between Remote Memory QubitsPhysical Review Letters, 2007
- Quantum Repeaters with Photon Pair Sources and Multimode MemoriesPhysical Review Letters, 2007
- Hybrid quantum repeater based on dispersive CQED interactions between matter qubits and bright coherent lightNew Journal of Physics, 2006
- Long-distance quantum communication with neutral atomsPhysical Review A, 2006
- Fault-Tolerant Quantum Communication Based on Solid-State Photon EmittersPhysical Review Letters, 2006
- Long-distance quantum communication with atomic ensembles and linear opticsNature, 2001
- Quantum Repeaters: The Role of Imperfect Local Operations in Quantum CommunicationPhysical Review Letters, 1998