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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum Information: Quantum Communication 1
Q 28.7: Talk
Wednesday, March 16, 2011, 12:00–12:15, SCH A01
Rate analysis for a hybrid quantum repeater — •Nadja Kolb Bernardes1,2, Ludmila Praxmeyer3, and Peter van Loock1,2 — 1OQI Group, MPL, Erlangen, Germany — 2Institute of Theoretical Physics I, University Erlangen-Nuremberg, Erlangen, Germany — 3Institute of Physics, Nicoulaus Copernicus University, Torun, Poland
We present a detailed rate analysis for a hybrid quantum repeater [1, 2] assuming perfect memories and using optimal probabilistic entanglement generation and deterministic swapping routines [3]. The hybrid quantum repeater protocol is based on atomic qubit-entanglement distribution through optical coherent-state communication. An exact, analytical formula for the rates of entanglement generation in quantum repeaters is derived, including a study on the impacts of entanglement purification and multiplexing strategies. More specifically, we consider scenarios with as little purification as possible and we show that for sufficiently low local losses, such purifications are still more powerful than multiplexing. In a possible experimental scenario, our hybrid system can create near-maximally entangled (F=0.98) pairs over a distance of 1280 km at rates of the order of 100 Hz.
[1] P. van Loock et al., Phys. Rev. Lett. 96, 240501 (2006).
[2] P. van Loock et al., Phys. Rev. A 78, 062319 (2008).
[3] N. K. Bernardes, L. Praxmeyer and P. van Loock, arXiv:1010.0106v1 (2010).