Qubit channels with small correlations

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dc.creatorCaruso, Filippo
dc.creatorGiovannetti, Vittorio
dc.creatorMacchiavello, Chiara
dc.creatorRuskai, Mary Beth
dc.date2008-03-21
dc.date2008-05-13
dc.date.accessioned2026-07-07T09:39:19Z
dc.date.available2026-07-07T09:39:19Z
dc.descriptionWe introduce a class of quantum channels with correlations acting on pairs of qubits, where the correlation takes the form of a shift operator onto a maximally entangled state. We optimise the output purity and show that below a certain threshold the optimum is achieved by partially entangled states whose degree of entanglement increases monotonically with the correlation parameter. Above this threshold, the optimum is achieved by the maximally entangled state characterizing the shift. Although, a full analysis can only be done for the 2-norm, both numerical and heuristic arguments indicate that this behavior and the optimal inputs are independent of p>1 when the optimal output purity is measured using the p-norm.
dc.description11 pages, 4 figures, 2 tables
dc.identifierhttps://arxiv.org/abs/0803.3172
dc.identifierhttp://arxiv.org/abs/0803.3172
dc.identifierPhysical Review A 77, 052323 (2008)
dc.identifierdoi:10.1103/PhysRevA.77.052323
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/161124
dc.subjectQuantum Physics
dc.titleQubit channels with small correlations
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