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Optical Superresolution Sensing of a Trapped Ion's Wave Packet Size.

Martín Drechsler1,2, Sebastian Wolf2, Christian T Schmiegelow1

  • 1Departamento de Física, FCEyN, UBA and IFIBA, UBA CONICET, Pabellón 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina.

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|October 15, 2021
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Summary

Researchers developed a superresolution optical sensing technique to measure the wave packet size of a single trapped ion. This adapted ground state depletion (GSD) method achieves high spatial resolution for quantum imaging applications.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Nanoscale sensing

Background:

  • Superresolution imaging techniques are crucial for probing nanoscale phenomena.
  • Ground state depletion (GSD) is a well-established optical sensing method.
  • Measuring the wave packet size of trapped ions provides insights into their quantum states.

Purpose of the Study:

  • To demonstrate superresolution optical sensing of a single trapped ion's wave packet size.
  • To adapt the ground state depletion (GSD) technique for coherent regime measurements.
  • To explore the potential of this method for direct quantum wave packet imaging.

Main Methods:

  • Utilizing a hollow laser beam to saturate a dipole-forbidden transition within a subdiffraction limited area.
  • Observing state-dependent fluorescence from a single trapped ^{40}Ca^{+} ion.
  • Spatially scanning the laser beam to measure wave packet sizes with high resolution.

Main Results:

  • Successfully measured the wave packet size of a near ground state cooled ion to be 39(9) nm.
  • Achieved a spatial resolution using a depletion beam waist of 4.2(1) μm.
  • Results closely matched independently deduced values from resolved sideband spectroscopy (32(2) nm).

Conclusions:

  • The adapted GSD technique enables precise measurement of trapped ion wave packet sizes.
  • This method offers a promising approach for direct quantum wave packet imaging.
  • Further investigation into resolution limits can enhance applications in quantum sensing.