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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| Principais autores: | , , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
American Physical Society
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/30408 |
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| 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 |
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