xQIT W. M. Keck Foundation Center For Extreme Quantum Information Theory at the Massachusetts Institute of Technology
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Implementation of Quantum Receivers for Communication and Sensing

November 19, 2008 - 9:45 - 10:10am

RLE Conference Center 36-428

Masahiro Takeoka

National Institute of Information and Communications Technology

Quantum-optical receivers to discriminate non-orthogonal states are important tools for both quantum and optical communications as well as for quantum sensing.  We discuss some implementation strategies of quantum receivers based on photon counting with and without classical feedback.  Particularly, for communication scenarios, we introduce a reliability function and its cut-off rate as figures of merit.  Interestingly, a variety of quantum measurements can attain the maximum  cut-off rate while some of them are not optimal from the viewpoints of  average error probability or mutual information.


Masahiro Takeoka received the Ph.D. degree in electrical engineering from Keio University in 2001.  Since 2001, he has been in National Institute of Information and Communications Technology (NICT) in Japan where he is currently a senior researcher and working on theory and proof-of-principle experiments on quantum detection theory, quantum information theory, and quantum optics. He is a member of the Physical Society of Japan.