Environment-assisted metrology with spin qubits
Abstract
We investigate the sensitivity of a recently proposed method for precision measurement [Phys. Rev. Lett. 106 140502 (2011)], focusing on an implementation based on solid-state spin systems. The scheme amplifies a quantum sensor response to weak external fields by exploiting its coupling to spin impurities in the environment. We analyze the limits to the sensitivity due to decoherence and propose dynamical decoupling schemes to increase the spin coherence time. The sensitivity is also limited by the environment spin polarization; therefore, we discuss strategies to polarize the environment spins and present a method to extend the scheme to the case of zero polarization. The coherence time and polarization determine a figure of merit for the environment's ability to enhance the sensitivity compared to echo-based sensing schemes. This figure of merit can be used to engineer optimized samples for high-sensitivity nanoscale magnetic sensing, such as diamond nanocrystals with controlled impurity density.
Additional Information
© 2012 American Physical Society. Received 23 December 2011; published 30 March 2012. This work was supported by the NSF, NIST, US Army Research Office (MURI Grant No. W911NF-11-1-0400), DARPA (QuASAR program), the Packard Foundation, the Danish National Research Foundation, the Sherman Fairchild Foundation and the NBRPC (973 program) 2011CBA00300 (2011CBA00301).Attached Files
Published - Cappellaro2012p17888Phys_Rev_A.pdf
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Additional details
- Eprint ID
- 31251
- Resolver ID
- CaltechAUTHORS:20120501-113828361
- NSF
- NIST
- W911NF-11-1-0400
- Army Research Office (ARO)
- Defense Advanced Research Projects Agency (DARPA)
- Danish National Research Foundation
- Sherman Fairchild Foundation
- 2011CBA00300
- NBRPC 973 program
- 2011CBA00301
- NBRPC 973 program
- Created
-
2012-05-01Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field