Environment-assisted metrology with spin qubits

P. Cappellaro, G. Goldstein, J. S. Hodges, L. Jiang, J. R. Maze, A. S. Sørensen, and M. D. Lukin
Phys. Rev. A 85, 032336 – Published 30 March 2012

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.

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  • Received 23 December 2011

DOI:https://doi.org/10.1103/PhysRevA.85.032336

©2012 American Physical Society

Authors & Affiliations

P. Cappellaro1,*, G. Goldstein2, J. S. Hodges1,2,†, L. Jiang3, J. R. Maze4, A. S. Sørensen5, and M. D. Lukin2

  • 1Nuclear Science and Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 3Institute for Quantum Information, California Institute of Technology, Pasadena, California 91125, USA
  • 4Faculty of Physics, Pontificia Universidad Catolica de Chile, Santiago 7820436, Chile
  • 5QUANTOP, Niels Bohr Institute, Copenhagen University, DK 2100, Denmark

  • *pcappell@mit.edu
  • Current address: Quantum Information Science Group, MITRE Corp. 260 Industrial Way West, Eatontown, New Jersey 07724, USA.

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Vol. 85, Iss. 3 — March 2012

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