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Searching for an exotic spin-dependent interaction with a single electron-spin quantum sensor.

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Researchers used a diamond quantum sensor to detect exotic spin interactions. This study sets new limits on electron-nucleon coupling at short force ranges, advancing searches for new physics beyond the standard model.

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Area of Science:

  • Fundamental Physics
  • Particle Physics
  • Quantum Sensing

Background:

  • Understanding physics beyond the standard model requires searching for new particles and interactions.
  • Existing laboratory searches for exotic spin-dependent interactions are limited to submillimeter force ranges.
  • Detecting interactions at shorter force ranges remains a significant experimental challenge.

Purpose of the Study:

  • To propose and demonstrate a novel quantum sensor for detecting short-range exotic interactions.
  • To utilize a near-surface nitrogen-vacancy (NV) center in diamond for detecting monopole-dipole interactions.
  • To set constraints on electron-nucleon coupling at previously inaccessible force ranges.

Main Methods:

  • Employed a near-surface nitrogen-vacancy center in diamond as a sensitive quantum sensor.
  • Designed an experiment to detect the monopole-dipole interaction between electron spins and nucleons.
  • Utilized quantum sensing principles to probe interactions within the 0.1-23 μm force range.

Main Results:

  • Successfully demonstrated the use of a diamond NV center for detecting monopole-dipole interactions.
  • Established constraints on the electron-nucleon coupling constant, denoted as [Formula: see text].
  • Achieved an upper bound for the coupling at a 20 μm force range of [Formula: see text] < 6.24 × 10-15.

Conclusions:

  • Near-surface NV centers in diamond are effective quantum sensors for probing short-range spin interactions.
  • The study provides stringent new limits on electron-nucleon coupling, pushing the frontiers of beyond standard model searches.
  • This work opens new avenues for laboratory searches of new particles and forces at microscopic scales.