Improved quantum magnetometry beyond the standard quantum limit

Brask, J. B.; Araújo, Rafael Chaves Souto; Kołodyński, J.

Improved quantum magnetometry beyond the standard quantum limit

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dc.contributor.author	Brask, J. B.
dc.contributor.author	Araújo, Rafael Chaves Souto
dc.contributor.author	Kołodyński, J.
dc.date.accessioned	2020-10-14T13:27:20Z
dc.date.available	2020-10-14T13:27:20Z
dc.date.issued	2015-07-22
dc.description.resumo	Under ideal conditions, quantum metrology promises a precision gain over classical techniques scaling quadratically with the number of probe particles. At the same time, no-go results have shown that generic, uncorrelated noise limits the quantum advantage to a constant factor. In frequency estimation scenarios, however, there are exceptions to this rule and, in particular, it has been found that transversal dephasing does allow for a scaling quantum advantage. Yet, it has remained unclear whether such exemptions can be exploited in practical scenarios. Here, we argue that the transversal-noise model applies to the setting of recent magnetometry experiments and show that a scaling advantage can be maintained with one-axistwisted spin-squeezed states and Ramsey-interferometry-like measurements. This is achieved by exploiting the geometry of the setup that, as we demonstrate, has a strong influence on the achievable quantum enhancement for experimentally feasible parameter settings. When, in addition to the dominant transversal noise, other sources of decoherence are present, the quantum advantage is asymptotically bounded by a constant, but this constant may be significantly improved by exploring the geometry	pt_BR
dc.identifier.citation	BRASK, J. B.; CHAVES, R.; KOłODYńSKI, J.. Improved quantum magnetometry beyond the standard quantum limit. Physical Review X, [S.L.], v. 5, n. 3, p. 031010, 22 jul. 2015. Disponível em: https://journals.aps.org/prx/abstract/10.1103/PhysRevX.5.031010. Acesso em: 04 out. 2020. http://dx.doi.org/10.1103/physrevx.5.031010.	pt_BR
dc.identifier.doi	10.1103/PhysRevX.5.031010
dc.identifier.issn	2160-3308
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30408
dc.language	en	pt_BR
dc.publisher	American Physical Society	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Atomic and Molecular Physics	pt_BR
dc.subject	Atomic and Molecular Physics	pt_BR
dc.subject	Quantum Information	pt_BR
dc.title	Improved quantum magnetometry beyond the standard quantum limit	pt_BR
dc.type	article	pt_BR