Covariant feedback Control of arbitrary qudit state against Depolarizing Noise is impossible

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dc.creatorZhang, ShengLi
dc.creatorZou, XuBo
dc.creatorLi, Chuanfeng
dc.creatorJin, ChenHui
dc.creatorGuo, GuangCan
dc.date2008-11-20
dc.date.accessioned2026-07-07T10:19:42Z
dc.date.available2026-07-07T10:19:42Z
dc.descriptionIn this paper, we prove that it is impossible to construct a convariant quantum feedback control instruments which aim to correct the channel noise imposed on an unknown qubit. The proof is based on the searching for the optimal quantum control protocol and it turns out there exist no better %\textit{Complete Positive Trace %Preserving}(CPTP) maps complete positive and covariant quantum operations which provide a higher fidelity than the trivial Identity operators. The generalization of the investigation to bipartite entangled pure state is also included.
dc.descriptionsubmitted for publication on June 29, 2008
dc.identifierhttps://arxiv.org/abs/0811.3254
dc.identifierhttp://arxiv.org/abs/0811.3254
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174607
dc.subjectQuantum Physics
dc.titleCovariant feedback Control of arbitrary qudit state against Depolarizing Noise is impossible
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