Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantum information: Concepts and methods IV

Q 46.1: Talk

Thursday, March 21, 2013, 11:00–11:15, E 001

Titel: How much can Alice tell Charlie about Bob? — •Alexander Streltsov¹ and Wojciech H. Zurek² — ¹Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf — ²Los Alamos

We consider the situation where two parties, Alice and Bob, share a joint quantum state. The aim of Alice is to transmit her state to a recipient Charlie while preserving the coherence with Bob. If Alice and Charlie are limited to use only local operations and classical communication (LOCC), intuition suggests that perfect transmission is possible whenever the state between Alice and Bob is separable. Here we show that this is not the case: there are separable states which do not allow for a perfect transmission via LOCC. We also generalize the problem to an arbitrary number of recipients and show that quantum discord arises as a natural figure of merit in this protocol.