The optimal cloning of quantum coherent states is non-Gaussian

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dc.creatorCerf, N. J.
dc.creatorKrueger, O.
dc.creatorNavez, P.
dc.creatorWerner, R. F.
dc.creatorWolf, M. M.
dc.date2004-10-07
dc.date2004-12-13
dc.date.accessioned2026-07-07T06:11:03Z
dc.date.available2026-07-07T06:11:03Z
dc.descriptionWe consider the optimal cloning of quantum coherent states with single-clone and joint fidelity as figures of merit. Both optimal fidelities are attained for phase space translation covariant cloners. Remarkably, the joint fidelity is maximized by a Gaussian cloner, whereas the single-clone fidelity can be enhanced by non-Gaussian operations: a symmetric non-Gaussian 1-to-2 cloner can achieve a single-clone fidelity of approximately 0.6826, perceivably higher than the optimal fidelity of 2/3 in a Gaussian setting. This optimal cloner can be realized by means of an optical parametric amplifier supplemented with a particular source of non-Gaussian bimodal states. Finally, we show that the single-clone fidelity of the optimal 1-to-infinity cloner, corresponding to a measure-and-prepare scheme, cannot exceed 1/2. This value is achieved by a Gaussian scheme and cannot be surpassed even with supplemental bound entangled states.
dc.description4 pages, 2 figures, revtex; changed title, extended list of authors, included optical implementation of optimal cloner
dc.identifierhttps://arxiv.org/abs/quant-ph/0410058
dc.identifierhttp://arxiv.org/abs/quant-ph/0410058
dc.identifierPhys. Rev. Lett. 95, 070501 (2005)
dc.identifierdoi:10.1103/PhysRevLett.95.070501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/92426
dc.subjectQuantum Physics
dc.titleThe optimal cloning of quantum coherent states is non-Gaussian
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