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Title: Dissipative Superradiant Spin Amplifier for Enhanced Quantum Sensing

Journal Article · · PRX Quantum

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 us 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 standard-quantum-limit-like scaling in N within a factor of 2, 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.

Research Organization:
National Quantum Information Science (QIS) Research Centers (United States). Next Generation Quantum Science and Engineering (Q-NEXT)
Sponsoring Organization:
USDOE; Defense Advanced Research Projects Agency (DARPA); Simons Foundation
Grant/Contract Number:
AC02-06CH11357; DOE 1F-60579; 669487
OSTI ID:
1982855
Journal Information:
PRX Quantum, Vol. 3, Issue 3; ISSN 2691-3399
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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