Optimal universal quantum cloning and state estimation

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dc.creatorBruss, D.
dc.creatorEkert, A.
dc.creatorMacchiavello, C.
dc.date1997-12-09
dc.date1998-10-08
dc.date.accessioned2026-07-07T12:33:24Z
dc.date.available2026-07-07T12:33:24Z
dc.descriptionWe derive a tight upper bound for the fidelity of a universal N to M qubit cloner, valid for any M \geq N, where the output of the cloner is required to be supported on the symmetric subspace. Our proof is based on the concatenation of two cloners and the connection between quantum cloning and quantum state estimation. We generalise the operation of a quantum cloner to mixed and/or entangled input qubits described by a density matrix supported on the symmetric subspace of the constituent qubits. We also extend the validity of optimal state estimation methods to inputs of this kind.
dc.description4 pages (RevTeX)
dc.identifierhttps://arxiv.org/abs/quant-ph/9712019
dc.identifierhttp://arxiv.org/abs/quant-ph/9712019
dc.identifierPhys.Rev.Lett.81:2598-2601,1998
dc.identifierdoi:10.1103/PhysRevLett.81.2598
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/217113
dc.subjectQuantum Physics
dc.titleOptimal universal quantum cloning and state estimation
dc.typetext

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