2003/04/30 by Peter van Loock, Norbert Lütkenhaus
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.69.012302
published as Phys. Rev. A 69, 012302 (2004) · final published version
arxiv created 2006/06/22 · arxiv updated 2016/08/16
We derive a set of criteria to decide whether a given projection measurement can be, in principle, exactly implemented solely by means of linear optics. The derivation can be adapted to various detection methods, including photon counting and homodyne detection. These criteria enable one to obtain easily No-Go theorems for the exact distinguishability of orthogonal quantum states with linear optics including the use of auxiliary photons and conditional dynamics.