Wideband Covariance Magnetometry below the Diffraction Limit

ORAL

Abstract

We experimentally demonstrate a method for measuring correlations of wideband magnetic signals with spatial resolution below the optical diffraction limit. Our technique employs two nitrogen-vacancy (NV) centers in diamond as nanoscale magnetometers, spectrally resolved by inhomogeneous optical transitions. Using high-fidelity optical readout and long spin coherence time, we probe correlated MHz-range noise with sensitivity of 15 nT Hz−1/4. In addition, we use this system for correlated T1 relaxometry, enabling correlation measurements of GHz-range noise. Under such externally applied noise, while individual NV centers exhibit featureless relaxation, their correlation displays rich coherent and incoherent dynamics reminiscent of superradiance physics. This capability to probe wideband correlations provides a powerful tool for investigating a variety of condensed-matter phenomena characterized by nonlocal correlations.

*This work was supported by Gordon and Betty Moore Foundation Grant No. 7797-01, National Science Foundation (Grant No. PHY-2012023), and the Center for Ultracold Atoms (an NSF Physics Frontiers Center).

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Publication: https://doi.org/10.1103/7xlj-52xt (arXiv: https://arxiv.org/abs/2505.00260)

Presenters

  • Xuan Hoang Le

    • Harvard University

Authors

  • Xuan Hoang Le

    • Harvard University

  • Pavel E Dolgirev

    • Harvard University

  • Piotr Put

    • Harvard University

  • Eric L Peterson

    • Harvard University

  • Arjun Pillai

    • Harvard University

  • Alexander A Zibrov

    • Harvard University

  • Eugene Demler

    • ETH Zurich

  • Hongkun Park

    • Harvard University

  • Mikhail D Lukin

    • Harvard University