Nanoscale magnetometry using a single-spin system in diamond

R. S. Said, D. W. Berry, and J. Twamley
Phys. Rev. B 83, 125410 – Published 17 March 2011

Abstract

We propose a protocol to estimate magnetic fields using a single nitrogen-vacancy (N-V) center in diamond, where the estimate precision scales inversely with time, δB~1/T, rather than the square-root of time, δB~1/T. The method is based on converting the task of magnetometry into phase estimation, performing quantum phase estimation on a single N-V nuclear spin using either adaptive or nonadaptive feedback control, and the recently demonstrated capability to perform single-shot readout within the N-V [P. Neumann et al., Science 329, 542 (2010)]. We present numerical simulations to show that our method provides an estimate whose precision scales close to ~1/T (T~ the total estimation time), and moreover will give an unambiguous estimate of the static magnetic field experienced by the N-V. By combining this protocol with recent proposals for scanning magnetometry using an N-V, our protocol will provide a significant decrease in signal acquisition time while providing an unambiguous spatial map of the magnetic field.

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  • Received 15 November 2010

DOI:https://doi.org/10.1103/PhysRevB.83.125410

©2011 American Physical Society

Authors & Affiliations

R. S. Said1, D. W. Berry2, and J. Twamley1

  • 1Centre for Engineered Quantum Systems, Department of Physics & Astronomy, Faculty of Science, Macquarie University, Sydney, NSW 2109, Australia
  • 2Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Ontario N2L 3G1, Canada

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Issue

Vol. 83, Iss. 12 — 15 March 2011

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