Moritz Ernst, IQC
Krishna Chetry, University of Cincinnati
Dr. Eric Chitambar , University of Toronto
Mario Tokoro, Sony Computer Science Laboratories Inc.
Mario Tokoro, Sony Computer Science Laboratories Inc.
John Teufel, National Institute of Standards and Technology
Dr. Jianming Cai, Institut für Theoretische Physik
Sergey Frolov, Delft University of Technology
Martin Suchara, Princeton University
Oleg Gittsovich, IQC
We present a framework for describing linear optical measurement devices. This leads to the definition of the squashing map. We demonstrate that this general approach gives strong statements for several measurement devices commonly used in optical implementations of quantum communication protocols.