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Multiplexed Scanning Microscopy with Dual-Qubit Spin Sensors.

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Researchers developed a multiplexed quantum sensing technique using dual nitrogen-vacancy (NV) centers for faster scanning probe microscopy. This method enables nanoscale imaging and measurement of spatiotemporal correlations, advancing materials science and condensed matter physics.

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Area of Science:

  • Quantum sensing
  • Scanning probe microscopy
  • Materials science

Background:

  • Scanning probe microscopy (SPM) offers high resolution but faces limitations in speed and measuring complex correlations.
  • Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors due to their sensitivity and controllability.
  • Multiqubit sensors can enhance SPM capabilities for advanced measurements.

Purpose of the Study:

  • To develop a multiplexed quantum sensing approach for SPM using dual NV centers.
  • To enable simultaneous imaging and measurement of spatiotemporal field correlations at the nanoscale.
  • To advance the capabilities of SPM for investigating phenomena like phase transitions and electronic noise.

Main Methods:

  • Utilized scanning probes with two nitrogen-vacancy (NV) centers at the tip apex.
  • Implemented a shared optical channel for simultaneous qubit initialization and readout.
  • Employed phase- and frequency-dependent microwave spin manipulations for demultiplexing readout signals.
  • Demonstrated scanning dual-NV magnetometry and recorded two-point covariance of field fluctuations.

Main Results:

  • Successfully demonstrated simultaneous imaging of multiple field projections in a ferrimagnetic racetrack device.
  • Recorded the two-point covariance of spatially correlated field fluctuations across a current-carrying wire.
  • Validated the multiplex framework for nanoscale spatiotemporal correlation measurements.

Conclusions:

  • The developed multiplexed quantum sensing framework significantly enhances SPM capabilities.
  • This technique allows for the investigation of diverse spatiotemporal correlations with nanoscale resolution.
  • Opens new avenues for studying quantum phenomena, materials properties, and electronic noise.