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Q: Quantenoptik

Q 123: Quantum Communication

Q 123.2: Vortrag

Montag, 4. März 2002, 16:45–17:00, HS 11/215

Secure communication with a publicly known key — •Almut Beige¹, Berthold-Georg Englert^1,2, Christian Kurtsiefer³, and Harald Weinfurter^1,3 — ¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — ²Departments of Mathematics and Physics, Texas A&M University, College Station, Texas 77843, U. S. A. — ³Sektion Physik, Universität München, Schellingstrasse 4, 80799 München, Germany

We present a scheme for direct and confidential communication between Alice and Bob, where there is no need for establishing a shared secret key first, and where the key used by Alice even will become known publicly. The communication is based on the exchange of single photons and each and every photon transmits one bit of Alice’s message without revealing any information to a potential eavesdropper.