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How many photons are needed to distinguish two transparencies?

Graeme Mitchison, Serge Massar, Stefano Pironio

quant-pharXiv:quant-ph/0105098

Abstract

We give a bound on the minimum number of photons that must be absorbed by any quantum protocol to distinguish between two transparencies. We show how a quantum Zeno method in which the angle of rotation is varied at each iteration can attain this bound in certain situations.

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