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