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  • Open Access

Multiplexed Scanning Microscopy with Dual-Qubit Spin Sensors

William S. Huxter1,2,*, Federico Dalmagioni1, and Christian L. Degen1,2,†

  • 1Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland
  • 2Quantum Center, ETH Zurich, 8093 Zurich, Switzerland

  • *Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • †Contact author: degenc@ethz.ch
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Phys. Rev. Lett. 135, 153801 – Published 6 October, 2025

DOI: https://doi.org/10.1103/y14n-44h3

Abstract

Scanning probe microscopy with multiqubit sensors offers the potential to improve imaging speed and measure previously inaccessible quantities, such as two-point correlations. We develop a multiplexed quantum sensing approach with scanning probes containing two nitrogen-vacancy (NV) centers at the tip apex. A shared optical channel is used for simultaneous qubit initialization and readout, while phase- and frequency-dependent microwave spin manipulations are leveraged for demultiplexing the optical readout signal. Scanning dual-NV magnetometry is first demonstrated by simultaneously imaging multiple field projections of a ferrimagnetic racetrack device. Then, we record the two-point covariance of spatially correlated field fluctuations across a current-carrying wire. Our multiplex framework establishes a method to investigate a variety of spatiotemporal correlations, including phase transitions and electronic noise, with nanoscale resolution.

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Phys. Rev. Lett. 135, 153801– Published 6 October, 2025
  • Received 27 July 2024
  • Accepted 20 August 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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