Comment on "Measuring a photonic qubit without destroying it"

Pieter Kok and William J. Munro

Physical Review Letters 95, 048901 (2005)

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Recently, Pryde et al reported the demonstration of a quantum non-demolition scheme for single-photon polarization states with linear optics and projective measurements [Phys. Rev. Lett. 92, 190402 (2004)]. Here, we argue that their interpretation of the experiment is inconsistent with the fidelity measure they use.

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