Signatures of incoherence in a quantum information processor

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dc.creatorHenry, Michael K.
dc.creatorGorshkov, Alexey V.
dc.creatorWeinstein, Yaakov S.
dc.creatorCappellaro, Paola
dc.creatorEmerson, Joseph
dc.creatorBoulant, Nicolas
dc.creatorHodges, Jonathan S.
dc.creatorRamanathan, Chandrasekhar
dc.creatorHavel, Timothy F.
dc.creatorMartinez, Rudy
dc.creatorCory, David G.
dc.date2007-05-24
dc.date2007-08-21
dc.date.accessioned2026-07-07T08:24:12Z
dc.date.available2026-07-07T08:24:12Z
dc.descriptionIncoherent noise is manifest in measurements of expectation values when the underlying ensemble evolves under a classical distribution of unitary processes. While many incoherent processes appear decoherent, there are important differences. The distribution functions underlying incoherent processes are either static or slowly varying with respect to control operations and so the errors introduced by these distributions are refocusable. The observation and control of incoherence in small Hilbert spaces is well known. Here we explore incoherence during an entangling operation, such as is relevant in quantum information processing. As expected, it is more difficult to separate incoherence and decoherence over such processes. However, by studying the fidelity decay under a cyclic entangling map we are able to identify distinctive experimental signatures of incoherence. This result is demonstrated both through numerical simulations and experimentally in a three qubit nuclear magnetic resonance implementation.
dc.description15 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0705.3666
dc.identifierhttp://arxiv.org/abs/0705.3666
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136264
dc.subjectQuantum Physics
dc.titleSignatures of incoherence in a quantum information processor
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