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Environment-assisted Quantum-enhanced Sensing with Electronic Spins in Diamond

Cooper, Alexandre and Sun, Won Kyu Calvin and Jaskula, Jean-Christophe and Cappellaro, Paola (2019) Environment-assisted Quantum-enhanced Sensing with Electronic Spins in Diamond. Physical Review Applied, 12 (4). Art. No. 044047. ISSN 2331-7019. doi:10.1103/physrevapplied.12.044047.

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The performance of solid-state quantum sensors based on electronic spin defects is often limited by the presence of environmental spin impurities that cause decoherence. A promising approach to improve these quantum sensors is to convert environment spins into useful resources for sensing, in particular, entangled states. However, the sensitivity enhancement that can be achieved from entangled states is limited by experimental constraints, such as control errors, decoherence, and time overheads. Here we experimentally demonstrate the efficient use of an unknown electronic spin defect in the proximity of a nitrogen-vacancy center in diamond to achieve both an entangled quantum sensor and a quantum memory for readout. We show that, whereas entanglement alone does not provide an enhancement in sensitivity, combining both entanglement and repetitive readout achieves an enhancement in performance over the use of a single-spin sensor, and more broadly we discuss regimes where sensitivity could be enhanced. Our results critically highlight the challenges in improving quantum sensors using entangled states of electronic spins, while providing an important benchmark in the quest for entanglement-assisted metrology.

Item Type:Article
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URLURL TypeDescription Paper
Cooper, Alexandre0000-0002-8759-9647
Additional Information:© 2019 American Physical Society. Received 27 November 2018; revised manuscript received 17 June 2019; published 21 October 2019. This work was in part supported by NSF Grants No. PHY1415345 and No. EECS1702716. A.C. acknowledges financial support by the Fulbright Program and the Natural Sciences and Engineering Research Council of Canada. We are grateful to Chinmay Belthangady and Huiliang Zhang for their experimental support.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Fulbright FoundationUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20191022-154116538
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99399
Deposited By: Tony Diaz
Deposited On:23 Oct 2019 16:55
Last Modified:16 Nov 2021 17:46

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