Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum Information: Quantum Communication I
Q 25.3: Talk
Wednesday, March 10, 2010, 11:00–11:15, E 214
Entanglement properties of optical coherent states under amplitude damping — •Ricardo Wickert1,2, Nadja Kolb Bernardes1,2, and Peter van Loock1,2 — 1Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light — 2Institute of Theoretical Physics I, Universität Erlangen-Nürnberg
Quantum Error Correction (QEC) codes aim to protect the information in fragile quantum states by encoding them into a larger Hilbert space; Entanglement Purification (EP) protocols aim to distill higher entanglement from a number of identically prepared copies of lower entanglement. It is known that QEC codes can be recast as EP schemes and vice-versa [1]. Through concurrence, we characterize the distillation capabilities of a known error correcting code for the amplitude damping channel [2]. An upper bound is established considering the non-orthogonality of the coherent-state basis [3].
[1] C. Bennett et al., Phys. Rev. A 54, 3824 (1996)
[2] S. Glancy et al., Phys. Rev. A 70, 22317 (2004)
[3] R. Wickert at al., in preparation (2009)