Path-Phase Information Complementarity for Interfering Particles through State-Discrimination

Details Path-Phase Information Complementarity for Interfering Particles through State-Discrimination Path-Phase Information Complementarity for Interfering Particles through State-Discrimination

2009-03-25

arxiv.org/abs/0903.4256v1

Physics

Quantum Physics

3 figures

Scientific paper

We analyze the trade-off between the amounts of information obtainable on complementary properties of a qubit state by simultaneous measurements. We consider a "state discrimination" scenario wherein the same measurements are repeated, but the input states must be guessed in every run. We find a general complementarity relation for path-phase guesses by any generalized measurements in this scenario. The counterpart of this input-output mutual information (MI) reveals a hitherto unknown aspect of complementarity.

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