Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 48: Quanteninformation: Quantenkommunikation I
Q 48.1: Talk
Thursday, March 5, 2009, 14:00–14:15, Audi-B
Robustness of an optimal d-dimensional teleportation protocol — •Bruno Gouvêa Taketani1, Fernando de Melo2, Andreas Buchleitner2, and Ruynet Lima de Matos Filho1 — 1Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, RJ 21941-972, Brazil — 2Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg
Quantum information tasks have as a main resource maximally entangled pure states. However, in real world applications, decoherence and impurities lead to the creation of mixed, non-maximally entangled quantum states. Protocols have been created to allow for the optimal usage of the non-local structure of such mixed states, but require complete knowledge of the noisy channel.
We consider here the robustness of the optimal teleportation protocol based on Bell measurements [1], for a d⊗ d bipartite system. In this protocol, Alice performs Bell measurements on her set of particles. Bob, who knows the quantum channel state and the result of Alice’s measurement, can decide which unitary operations to apply to his system, in order to maximize the protocol’s fidelity. We analyze the robustness of this protocol when the channel is not completely known.
[1] S. Albeverio, S. M. Fei, and W. L. Yang, Phys. Rev. A 66, 012301 (2002).