Entangled states maximize the two qubit channel capacity for some Pauli channels with memory

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dc.creatorMacchiavello, C.
dc.creatorPalma, G. M.
dc.creatorVirmani, S.
dc.date2003-07-02
dc.date.accessioned2026-07-07T06:22:09Z
dc.date.available2026-07-07T06:22:09Z
dc.descriptionWe prove that a general upper bound on the maximal mutual information of quantum channels is saturated in the case of Pauli channels with an arbitrary degree of memory. For a subset of such channels we explicitly identify the optimal signal states. We show analytically that for such a class of channels entangled states are indeed optimal above a given memory threshold. It is noteworthy that the resulting channel capacity is a non-differentiable function of the memory parameter.
dc.description4 pages no figures
dc.identifierhttps://arxiv.org/abs/quant-ph/0307016
dc.identifierhttp://arxiv.org/abs/quant-ph/0307016
dc.identifierPhys. Rev. A., 69, 010303(R), (2004)
dc.identifierdoi:10.1103/PhysRevA.69.010303
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95825
dc.subjectQuantum Physics
dc.titleEntangled states maximize the two qubit channel capacity for some Pauli channels with memory
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