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- W2017802279 abstract "We present optimal and minimal measurements on identical copies of an unknown state of a qubit when the quality of measuring strategies is quantified with the gain of information (Kullback of probability distributions). We also show that the maximal gain of information occurs, among isotropic priors, when the state is known to be pure. Universality of optimal measurements follows from our results: using the fidelity or the gain of information, two different figures of merits, leads to exactly the same conclusions. We finally investigate the optimal capacity of $N$ copies of an unknown state as a quantum channel of information." @default.
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- W2017802279 modified "2023-10-14" @default.
- W2017802279 title "Universality of optimal measurements" @default.
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- W2017802279 doi "https://doi.org/10.1103/physreva.60.r3339" @default.
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