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Quantum lock-in force sensing using optical clock Doppler velocimetry.

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This study demonstrates a novel force sensor using a single trapped strontium ion. It achieves unprecedented sensitivity for detecting low-frequency forces below resonance.

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Area of Science:

  • Quantum sensing
  • Atomic physics
  • Nanotechnology

Background:

  • Force sensors are crucial for technologies like atomic force microscopy and inertial sensing.
  • Measuring low-frequency forces is challenging due to small oscillation amplitudes below resonance.

Purpose of the Study:

  • To develop a highly sensitive force sensor for low-frequency measurements.
  • To utilize a single trapped ion as a sensitive probe for force detection.

Main Methods:

  • Employing a single trapped 88Sr+ ion as the force sensor.
  • Driving the ion electrically at frequencies below its trap resonance frequency.
  • Measuring motion via Doppler shift of an atomic optical clock transition, enhanced by quantum lock-in techniques.

Main Results:

  • Achieved a frequency force detection sensitivity of 2.8 × 10^-20 NHz^-1/2.
  • Demonstrated effective force sensing at frequencies below the mechanical resonance.

Conclusions:

  • A single trapped ion can serve as an ultrasensitive force sensor for low-frequency applications.
  • The quantum lock-in technique significantly enhances sensitivity in ion-based force detection.