Purity and State Fidelity of Quantum Channels via Hamiltonians

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dc.creatorZanardi, Paolo
dc.creatorLidar, Daniel
dc.date2004-03-09
dc.date.accessioned2026-07-07T06:23:08Z
dc.date.available2026-07-07T06:23:08Z
dc.descriptionWe associate to every quantum channel $T$ acting on a Hilbert space $\mathcal{H}$ a pair of Hamiltonian operators over the symmetric subspace of $\mathcal{H}^{\otimes 2}$. 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.
dc.description7 Pages
dc.identifierhttps://arxiv.org/abs/quant-ph/0403074
dc.identifierhttp://arxiv.org/abs/quant-ph/0403074
dc.identifierPhys. Rev. A 70, 012315 (2004)
dc.identifierdoi:10.1103/PhysRevA.70.012315
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/96127
dc.subjectQuantum Physics
dc.titlePurity and State Fidelity of Quantum Channels via Hamiltonians
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