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Article: Optimal networks for quantum metrology: Semidefinite programs and product rules

TitleOptimal networks for quantum metrology: Semidefinite programs and product rules
Authors
Issue Date2012
Citation
New Journal of Physics, 2012, v. 14 How to Cite?
AbstractWe investigate the optimal estimation of a quantum process that can possibly consist of multiple time steps. The estimation is implemented by a quantum network that interacts with the process by sending an input and processing the output at each time step. We formulate the search for the optimal network as a semidefinite program and use duality theory to give an alternative expression for the maximum payoff achieved by estimation. Combining this formulation with a technique devised by Mittal and Szegedy we prove a general product rule for the joint estimation of independent processes, stating that the optimal joint estimation can be achieved by estimating each process independently, whenever the figure of merit is of a product form. We illustrate the result in several examples and exhibit counterexamples showing that the optimal joint network may not be the product of the optimal individual networks if the processes are not independent or if the figure of merit is not of the product form. In particular, we show that entanglement can reduce by a factor K the variance in the estimation of the sum of K independent phase shifts. © IOP Publishing and Deutsche Physikalische Gesellschaft.
Persistent Identifierhttp://hdl.handle.net/10722/213284
ISSN
2015 Impact Factor: 3.57
2015 SCImago Journal Rankings: 1.902
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChiribella, Giulio-
dc.date.accessioned2015-07-28T04:06:46Z-
dc.date.available2015-07-28T04:06:46Z-
dc.date.issued2012-
dc.identifier.citationNew Journal of Physics, 2012, v. 14-
dc.identifier.issn1367-2630-
dc.identifier.urihttp://hdl.handle.net/10722/213284-
dc.description.abstractWe investigate the optimal estimation of a quantum process that can possibly consist of multiple time steps. The estimation is implemented by a quantum network that interacts with the process by sending an input and processing the output at each time step. We formulate the search for the optimal network as a semidefinite program and use duality theory to give an alternative expression for the maximum payoff achieved by estimation. Combining this formulation with a technique devised by Mittal and Szegedy we prove a general product rule for the joint estimation of independent processes, stating that the optimal joint estimation can be achieved by estimating each process independently, whenever the figure of merit is of a product form. We illustrate the result in several examples and exhibit counterexamples showing that the optimal joint network may not be the product of the optimal individual networks if the processes are not independent or if the figure of merit is not of the product form. In particular, we show that entanglement can reduce by a factor K the variance in the estimation of the sum of K independent phase shifts. © IOP Publishing and Deutsche Physikalische Gesellschaft.-
dc.languageeng-
dc.relation.ispartofNew Journal of Physics-
dc.titleOptimal networks for quantum metrology: Semidefinite programs and product rules-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1088/1367-2630/14/12/125008-
dc.identifier.scopuseid_2-s2.0-84871866526-
dc.identifier.volume14-
dc.identifier.isiWOS:000312487300002-

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