Improved quantum magnetometry beyond the standard quantum limit
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 estimat...
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ri-123456789-304082020-10-18T07:53:57Z Improved quantum magnetometry beyond the standard quantum limit Brask, J. B. Araújo, Rafael Chaves Souto Kołodyński, J. Atomic and Molecular Physics Atomic and Molecular Physics Quantum Information 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 2020-10-14T13:27:20Z 2020-10-14T13:27:20Z 2015-07-22 article 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. 2160-3308 https://repositorio.ufrn.br/handle/123456789/30408 10.1103/PhysRevX.5.031010 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf American Physical Society |
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English |
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Atomic and Molecular Physics Atomic and Molecular Physics Quantum Information |
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Atomic and Molecular Physics Atomic and Molecular Physics Quantum Information Brask, J. B. Araújo, Rafael Chaves Souto Kołodyński, J. Improved quantum magnetometry beyond the standard quantum limit |
| description |
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 |
| format |
article |
| author |
Brask, J. B. Araújo, Rafael Chaves Souto Kołodyński, J. |
| author_facet |
Brask, J. B. Araújo, Rafael Chaves Souto Kołodyński, J. |
| author_sort |
Brask, J. B. |
| title |
Improved quantum magnetometry beyond the standard quantum limit |
| title_short |
Improved quantum magnetometry beyond the standard quantum limit |
| title_full |
Improved quantum magnetometry beyond the standard quantum limit |
| title_fullStr |
Improved quantum magnetometry beyond the standard quantum limit |
| title_full_unstemmed |
Improved quantum magnetometry beyond the standard quantum limit |
| title_sort |
improved quantum magnetometry beyond the standard quantum limit |
| publisher |
American Physical Society |
| publishDate |
2020 |
| url |
https://repositorio.ufrn.br/handle/123456789/30408 |
| work_keys_str_mv |
AT braskjb improvedquantummagnetometrybeyondthestandardquantumlimit AT araujorafaelchavessouto improvedquantummagnetometrybeyondthestandardquantumlimit AT kołodynskij improvedquantummagnetometrybeyondthestandardquantumlimit |
| _version_ |
1773961186656649216 |