Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.4: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
High-fidelity entanglement purification using chains of atoms and optical cavities — •Denis Gonta1,2 and Peter van Loock1,2 — 1Institut of Optik, Information und Photonik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen — 2Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, Bau 26, D-91058 Erlangen
In our previous work [1], we proposed a practical scheme to purify dynamically a bipartite entangled state using short chains of atoms coupled to high-finesse optical cavities. In contrast to conventional entanglement purification protocols, we avoid CNOT gates and thus reduce complicated pulse sequences and superfluous qubit operations. In this paper, we significantly improve the output fidelity of remotely entangled atoms by introducing one additional entanglement mechanism in each of the repeater nodes and by optimizing the laser pulses required to control the entire scheme. The latter entanglement mechanism exploits again the cavity-QED dynamics and requires only one extra high-finesse cavity in each node of the repeater. Our improved distillation scheme together with entanglement distribution and swapping, opens an attractive route towards efficient and experimentally feasible quantum repeaters for long-distance quantum communication.
[1] D. Gonta and P. van Loock, Phys. Rev. A 84, 042303 (2011).