Related papers: Wideband covariance magnetometry below the diffraction limit

Wideband covariance magnetometry below the diffraction limit

URL: http://arxiv.org/abs/2505.00260v1
Date: Thu, 01 May 2025 03:01:48 GMT
Title: Wideband covariance magnetometry below the diffraction limit
Authors: Xuan Hoang Le, Pavel E. Dolgirev, Piotr Put, Eric L. Peterson, Arjun Pillai, Alexander A. Zibrov, Eugene Demler, Hongkun Park, Mikhail D. Lukin,
Abstract summary: We experimentally demonstrate a method for measuring correlations of wideband magnetic signals with spatial resolution below the optical diffraction limit.<n>Our technique employs two nitrogen-vacancy (NV) centers in diamond as nanoscale magnetometers.
Score: 33.83310724797305
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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 $T_1$ 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 high-frequency correlations provides a powerful tool for investigating a variety of condensed-matter phenomena characterized by nonlocal correlations.

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