Efficient universal programmable quantum measurements

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dc.creatorD'Ariano, Giacomo Mauro
dc.creatorPerinotti, Paolo
dc.date2004-10-21
dc.date.accessioned2026-07-07T07:52:55Z
dc.date.available2026-07-07T07:52:55Z
dc.descriptionA universal programmable detector is a device that can be tuned to perform any desired measurement on a given quantum system, by changing the state of an ancilla. With a finite dimension d for the ancilla only approximate universal programmability is possible, with "size" d=f(1/e) increasing function of the "accuracy" 1/e. In this letter we show that, much better than the exponential size known in the literature, one can achieve polynomial size. An explicit example with linear size is also presented. Finally, we show that for covariant measurements exact programmability is feasible.
dc.description4 pages, RevTex4
dc.identifierhttps://arxiv.org/abs/quant-ph/0410169
dc.identifierhttp://arxiv.org/abs/quant-ph/0410169
dc.identifierPhys. Rev. Lett. 94, 090401 (2005)
dc.identifierdoi:10.1103/PhysRevLett.94.090401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126061
dc.subjectQuantum Physics
dc.titleEfficient universal programmable quantum measurements
dc.typetext

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