Wideband Covariance Magnetometry below the Diffraction Limit

Oral-In-person

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.

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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 Dolgirev

    • Harvard University

  • Piotr Put

    • Harvard University

  • Eric Peterson

    • Harvard University

  • Arjun Pillai

  • Alexander Zibrov

  • Eugene Demler

    • ETH Zurich

  • Hongkun Park

    • Harvard University

  • Mikhail Lukin

    • Harvard University