Optimal approximate reversal of quantum operations on a single qubit

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dc.creatorYeo, Ye
dc.date2002-10-10
dc.date.accessioned2026-07-07T06:05:12Z
dc.date.available2026-07-07T06:05:12Z
dc.descriptionWe demonstrate how insights gained from reformulating the problem of quantum teleportation into one of reversing quantum operations, and designing optimum completely positive maps for teleportation, can enable one to explore optimal approximate reversal of quantum operations on a single qubit. In particular, we show that the optimal approximate reversal of a generalized depolarizing channel can be achieved using only unitary transformations. We also show that for a quantum channel, which reveals some information about the input state, extremal completely positive maps and not unitary transformations yield optimal approximate reversal.
dc.description9 pages, REVTex4
dc.identifierhttps://arxiv.org/abs/quant-ph/0210071
dc.identifierhttp://arxiv.org/abs/quant-ph/0210071
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/90558
dc.subjectQuantum Physics
dc.titleOptimal approximate reversal of quantum operations on a single qubit
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