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Surpassing the Energy Resolution Limit with ferromagnetic torque sensors

Surpassing the Energy Resolution Limit with ferromagnetic torque sensors
Surpassing the Energy Resolution Limit with ferromagnetic torque sensors
We discuss the fundamental noise limitations of a ferromagnetic torque sensor based on a levitated magnet in the tipping regime. We evaluate the optimal magnetic eld resolution taking into account the thermomechanical noise and the mechanical detection noise at the standard quantum limit (SQL).We nd that the Energy Resolution Limit (ERL), pointed out in recent literature as a relevant benchmark for most classes of magnetometers, can be surpassed by many orders of magnitude. Moreover, similarly to the case of a ferromagnetic gyroscope, it is also possible to surpass the standard quantum limit for magnetometry with independent spins, arising from spin-projection noise. Our nding indicates that magneto mechanical systems optimized for magnetometry can achieve a magnetic eld resolution per unit volume several orders of magnitude better than any conventional magnetometer. We discuss possible implications, focusing on fundamental physics problems such as the search for exotic interactions beyond the standard model.
1079-7114
Vinante, Andrea
c60154c0-c24c-461e-8311-11555b3c846d
Timberlake, Chris
b3bf67da-90de-42cc-8f3d-9be81d27805a
Budker, Dmitry
6f01c9d0-681a-4e3d-bf79-a506e5cdbc58
Jackson Kimball, Derek F.
326a4f96-e2fc-414a-ad5b-b5600f1ebf64
Sushkov, Alexander O.
33a5136b-e390-45db-b7a6-2e2882510f56
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Vinante, Andrea
c60154c0-c24c-461e-8311-11555b3c846d
Timberlake, Chris
b3bf67da-90de-42cc-8f3d-9be81d27805a
Budker, Dmitry
6f01c9d0-681a-4e3d-bf79-a506e5cdbc58
Jackson Kimball, Derek F.
326a4f96-e2fc-414a-ad5b-b5600f1ebf64
Sushkov, Alexander O.
33a5136b-e390-45db-b7a6-2e2882510f56
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d

Vinante, Andrea, Timberlake, Chris, Budker, Dmitry, Jackson Kimball, Derek F., Sushkov, Alexander O. and Ulbricht, Hendrik (2021) Surpassing the Energy Resolution Limit with ferromagnetic torque sensors. Physical Review Letters. (In Press)

Record type: Article

Abstract

We discuss the fundamental noise limitations of a ferromagnetic torque sensor based on a levitated magnet in the tipping regime. We evaluate the optimal magnetic eld resolution taking into account the thermomechanical noise and the mechanical detection noise at the standard quantum limit (SQL).We nd that the Energy Resolution Limit (ERL), pointed out in recent literature as a relevant benchmark for most classes of magnetometers, can be surpassed by many orders of magnitude. Moreover, similarly to the case of a ferromagnetic gyroscope, it is also possible to surpass the standard quantum limit for magnetometry with independent spins, arising from spin-projection noise. Our nding indicates that magneto mechanical systems optimized for magnetometry can achieve a magnetic eld resolution per unit volume several orders of magnitude better than any conventional magnetometer. We discuss possible implications, focusing on fundamental physics problems such as the search for exotic interactions beyond the standard model.

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Surpassing the Energy Resolution Limit with ferromagnetic torque sensors - Accepted Manuscript
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Accepted/In Press date: 21 July 2021

Identifiers

Local EPrints ID: 450493
URI: http://eprints.soton.ac.uk/id/eprint/450493
ISSN: 1079-7114
PURE UUID: 32cba7f2-3522-46b9-bd3f-27b8ff8c27df

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Date deposited: 30 Jul 2021 16:30
Last modified: 30 Jul 2021 16:30

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Contributors

Author: Andrea Vinante
Author: Chris Timberlake
Author: Dmitry Budker
Author: Derek F. Jackson Kimball
Author: Alexander O. Sushkov

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