Dissipative superradiant spin amplifier for enhanced quantum sensing

• URL: http://arxiv.org/abs/2111.15647v3
• Date: Sun, 4 Dec 2022 00:54:04 GMT
• Title: Dissipative superradiant spin amplifier for enhanced quantum sensing
• Authors: Martin Koppenh\"ofer, Peter Groszkowski, Hoi-Kwan Lau, A. A. Clerk
• Abstract summary: We present a dissipative "spin amplification" protocol that allows one to dramatically improve the sensitivity of such schemes. Our method is based on exploiting collective (i.e., superradiant) spin decay. We show that our approach can allow a system with a highly imperfect spin readout to approach $N$ within a factor of two, without needing to change the actual readout mechanism.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum metrology protocols exploiting ensembles of $N$ two-level systems and Ramsey-style measurements are ubiquitous. However, in many cases excess readout noise severely degrades the measurement sensitivity; in particular in sensors based on ensembles of solid-state defect spins. We present a dissipative "spin amplification" protocol that allows one to dramatically improve the sensitivity of such schemes, even in the presence of realistic intrinsic dissipation and noise. Our method is based on exploiting collective (i.e., superradiant) spin decay, an effect that is usually seen as a nuisance because it limits spin-squeezing protocols. We show that our approach can allow a system with a highly imperfect spin readout to approach SQL-like scaling in $N$ within a factor of two, without needing to change the actual readout mechanism. Our ideas are compatible with several state-of-the-art experimental platforms where an ensemble of solid-state spins (NV centers, SiV centers) is coupled to a common microwave or mechanical mode.

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