Enhanced multiqubit phase estimation in noisy environments by local encoding

Proietti, Massimiliano; Ringbauer, Martin; Graffitti, Francesco; Barrow, Peter; Pickston, Alexander; Kundys, Dmytro; Cavalcanti, Daniel; Aolita, Leandro; Araújo, Rafael Chaves Souto; Fedrizzi, Alessandro

Enhanced multiqubit phase estimation in noisy environments by local encoding

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dc.contributor.author	Proietti, Massimiliano
dc.contributor.author	Ringbauer, Martin
dc.contributor.author	Graffitti, Francesco
dc.contributor.author	Barrow, Peter
dc.contributor.author	Pickston, Alexander
dc.contributor.author	Kundys, Dmytro
dc.contributor.author	Cavalcanti, Daniel
dc.contributor.author	Aolita, Leandro
dc.contributor.author	Araújo, Rafael Chaves Souto
dc.contributor.author	Fedrizzi, Alessandro
dc.date.accessioned	2020-09-28T13:41:44Z
dc.date.available	2020-09-28T13:41:44Z
dc.date.issued	2019-11-01
dc.description.resumo	The first generation of multiqubit quantum technologies will consist of noisy, intermediate-scale devices for which active error correction remains out of reach. To exploit such devices, it is thus imperative to use passive error protection that meets a careful trade-off between noise protection and resource overhead. Here, we experimentally demonstrate that single-qubit encoding can significantly enhance the robustness of entanglement and coherence of four-qubit graph states against local noise with a preferred direction. In particular, we explicitly show that local encoding provides a significant practical advantage for phase estimation in noisy environments. This demonstrates the efficacy of local unitary encoding under realistic conditions, with potential applications in multiqubit quantum technologies for metrology, multipartite secrecy, and error correction	pt_BR
dc.identifier.citation	PROIETTI, Massimiliano; RINGBAUER, Martin; GRAFFITTI, Francesco; BARROW, Peter; PICKSTON, Alexander; KUNDYS, Dmytro; CAVALCANTI, Daniel; AOLITA, Leandro; CHAVES, Rafael; FEDRIZZI, Alessandro. Enhanced multiqubit phase estimation in noisy environments by local encoding. Physical Review Letters, [S.L.], v. 123, n. 18, p. 180503, 1 nov. 2019. Disponível em: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.180503. Acesso em: 16 set. 2020. http://dx.doi.org/10.1103/physrevlett.123.180503.	pt_BR
dc.identifier.doi	10.1103/PhysRevLett.123.180503
dc.identifier.issn	0031-9007
dc.identifier.issn	1079-7114
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30208
dc.language	en	pt_BR
dc.publisher	American Physical Society	pt_BR
dc.subject	Quantum channels	pt_BR
dc.subject	Quantum error correction	pt_BR
dc.subject	Quantum metrology	pt_BR
dc.subject	Quantum optics	pt_BR
dc.subject	Quantum parameter estimation	pt_BR
dc.subject	Resource theories	pt_BR
dc.title	Enhanced multiqubit phase estimation in noisy environments by local encoding	pt_BR
dc.type	article	pt_BR