Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.2: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Hybrid quantum repeater with encoding — •Nadja Kolb Bernardes1,2 and Peter van Loock1,2 — 1OQI Group, MPL, Erlangen, Germany — 2Institute of Theoritical Physics I, Uni. Erlangen-Nuremberg, Erlangen, Germany
In the context of the quantum repeater, practical limitations as finite memory decoherence times and imperfect two-qubit operations will constraint the final-state fidelity and the key generation rate of the protocol. By aiming to improve the hybrid quantum repeater [1,2] against these limitations, we present an encoded scheme using Calderbank-Shor-Steane codes [3]. For the case of repetition codes, we propose an explicit implementation of the quantum error correction protocol. Moreover, we analyze the entangled-pair distribution rate for the hybrid quantum repeater with encoding and we clearly identify a triple trade-off between the efficiency of the codes, the memory decoherence time, and the local gate errors. Finally, we show that in the presence of reasonable imperfections our system can achieve rates of roughly 620 Hz per memory for 20 km repeater spacing, a final distance of 1280 km, and final fidelity of about 0.95.
[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 and P. van Loock, arXiv:1105.3566 (2010).