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- W1993274314 abstract "We associate with every quantum channel $T$ acting on a Hilbert space $mathcal{H}$ a pair of Hermitian operators, referred to as ``Hamiltonians,'' over the symmetric subspace of ${mathcal{H}}^{ensuremath{bigotimes}2}$. The expectation values of these Hamiltonians over symmetric product states give either the purity or the pure-state fidelity of $T$. This allows us to analytically compute these measures for a wide class of channels, and to identify states that are optimal with respect to these measures." @default.
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- W1993274314 date "2004-07-29" @default.
- W1993274314 modified "2023-09-27" @default.
- W1993274314 title "Purity and state fidelity of quantum channels" @default.
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- W1993274314 doi "https://doi.org/10.1103/physreva.70.012315" @default.
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