Correlations of Continuous Weak Measurements on a Single Spin

ORAL

Abstract

In the last years, the nitrogen-vacancy defect in diamond has been established as an exceptional quantum sensor for physical quantities like magnetic and electric fields, capable of detecting the faint signal of only a few proton nuclear spin outside the diamond crystal [1]. In order to perform nuclear magnetic resonance spectroscopy (NMR) on such samples, a continuous readout scheme was developed by several different groups [2-4].
We explain how this scheme, when applied to the spectroscopic investigation of individual nuclear spins, can be understood as subsequent weak measurements of the nuclear spin with non-commuting measurement operators. When varying the parameters of the measurement, the observed nuclear spin signal deviates from the intrinsic Larmor precession, towards a regime where the signal is dominated by the measurement.

[1] Staudacher, T. et al. Science 339, 561-563 (2013).
[2] Schmitt, S. et al. Science 356, 832–837 (2017).
[3] Boss, J. M., Cujia, K. S., Zopes, J. & Degen, C. L. Science 356, 837–840 (2017).
[4] Bucher, D. B. et al. arXiv:1705.08887 [quant-ph] (2017).

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Presenters

  • Matthias Pfender

    • University Stuttgart
    • Physics Department, University of Stuttgart

Authors

  • Matthias Pfender

    • University Stuttgart
    • Physics Department, University of Stuttgart

  • Wang Ping

    • Beijing Computational Science Research Center

  • Nabeel Aslam

    • University Stuttgart
    • Physics, University of Stuttgart
    • Physics Department, University of Stuttgart

  • Wen Yang

    • Beijing Computational Science Research Center

  • Philipp Neumann

    • University Stuttgart
    • 3rd Institute of Physics, University of Stuttgart
    • Physics Department, University of Stuttgart

  • Renbao Liu

    • Department of Physics and Centre for Quantum Coherence, Chinese University of Hong Kong
    • Department of Physics, The Chinese University of Hong Kong
    • The Chinese University of Hong Kong
    • Chinese University of Hong Kong

  • J. Wrachtrup

    • University Stuttgart
    • 3. Physikalisches Institut, Universität Stuttgart
    • Univ Stuttgart
    • 3rd Institute of Physics, University of Stuttgart
    • University of Stuttgart
    • Physics Department, University of Stuttgart