Universität zu Köln

Brask, J. B., Chaves, R. and Kolodynski, J. (2015). Improved Quantum Magnetometry beyond the Standard Quantum Limit. Phys. Rev. X, 5 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2160-3308

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Abstract

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-axis-twisted 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Brask, J. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chaves, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kolodynski, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-398696
DOI:	10.1103/PhysRevX.5.031010
Journal or Publication Title:	Phys. Rev. X
Volume:	5
Number:	3
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2160-3308
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ENHANCED METROLOGY; STATES; SPECTROSCOPY; ENTANGLEMENT; NOISE Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39869