Simple criteria for projective measurements with linear optics

Abstract

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.

final published version

References in corpus (4)

• High-fidelity quantum logic operations using linear optical elements
• Generalized measurements by linear elements
• On a linear optical implementation of non local product states and on their indistinguishability
• The role of auxiliary states in state discrimination with linear optical evices

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