6533b855fe1ef96bd12b0a6d
RESEARCH PRODUCT
Surpassing the Energy Resolution Limit with Ferromagnetic Torque Sensors
Dmitry BudkerDmitry BudkerDerek F. Jackson KimballAndrea VinanteChris TimberlakeAlexander O. SushkovHendrik Ulbrichtsubject
PhysicsQuantum PhysicsPhysics - Instrumentation and DetectorsMagnetometerOrders of magnitude (temperature)Quantum limitFOS: Physical sciencesGeneral Physics and AstronomyGyroscopeInstrumentation and Detectors (physics.ins-det)01 natural sciencesNoise (electronics)010305 fluids & plasmaslaw.inventionMagnetic fieldComputational physicslawMagnet0103 physical sciencesTorque sensorddc:530Quantum Physics (quant-ph)010306 general physicsdescription
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 field resolution taking into account the thermomechanical noise and the mechanical detection noise at the standard quantum limit (SQL). We find 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 finding indicates that magnetomechanical systems optimized for magnetometry can achieve a magnetic field 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-04-29 |