Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121. For more information, contact Diego Dalvit.

March 21, 2007
Wednesday, 12:30 PM

Paul G. Kwiat,
University of Illinois at Urbana-Champaign

Advanced Quantum Communication Protocols

Abstract

The usefulness of quantum entanglement for various tasks in secure and efficient communication is now well established. We have been investigating how the usual benefits can be further extended, by incorporating other elements of modern physics (e.g., relativity) and using more complex quantum states (e.g., "hyperentanglement"). In the former case, one can double or triple the efficiency of traditional quantum key distribution protocols; in the latter case one can achieve complete Bell-state analysis, and increase the capacity of superdense coding to 2.8 bits/photon. I will discuss our experimental progress in these areas, with an eye toward future developments.