Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quanteninformation (Konzepte und Methoden I)
Q 31.3: Talk
Thursday, March 13, 2008, 09:00–09:15, 1B
Complementarity, Privacy, and Entanglement — •Joseph M. Renes1 and Jean-Christian Boileau2 — 1Institut für Angewandte Physik, TU Darmstadt, Germany — 2Center for Quantum Information and Quantum Control, University of Toronto, Canada
We develop a complementary information tradeoff which bounds the amount of information about complementary observables that can be simultaneously extracted from a quantum system. This leads directly to a simple characterization both private states (the quantum version of secret keys) and maximally-entangled states, revealing these to be a direct manifestation of the quantum mechanical phenomenon of complementarity. Furthermore, we conjecture a strengthened version of the tradeoff and show how these ideas can be adapted to create protocols for distilling secret keys or entangled states.