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Nonclassical structured light with quantum fluctuations enables high-harmonic generation (HHG) using circular polarization, overcoming previous limitations. Different squeezing types modify HHG spectral properties by altering electron dynamics.

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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Attosecond science

Background:

  • High-harmonic generation (HHG) is a nonlinear process converting laser light to higher frequencies.
  • HHG is typically inhibited by circularly polarized light.
  • Controlling HHG is crucial for applications in spectroscopy and attosecond science.

Purpose of the Study:

  • To investigate the use of nonclassical structured light to enable HHG with circular polarization.
  • To explore how quantum features of light influence HHG dynamics and spectral properties.
  • To establish new methods for controlling light-matter interactions in HHG.

Main Methods:

  • Utilizing circularly polarized light with nonclassical fluctuations (squeezing).
  • Analyzing the spectral properties of the generated high harmonics.
  • Investigating the underlying electron dynamics during the HHG process.

Main Results:

  • Demonstrated HHG with circularly polarized light using nonclassical fluctuations.
  • Showcased that nonclassical features of light can initiate and control HHG.
  • Observed that spectral properties of harmonics depend on the type of squeezing applied.

Conclusions:

  • Nonclassical structured light provides a novel pathway to control HHG in configurations previously prohibitive for classical light.
  • The study links specific quantum squeezing types to modifications in the HHG three-step mechanism via electron dynamics.
  • This research integrates quantum optics principles into HHG, opening avenues for advanced light-matter interaction control.