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Nonlinear atomic tunnelling boosted by bright squeezed vacuum.

Zhejun Jiang1, Shengzhe Pan1, Jianqi Chen1

  • 1State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.

Nature
|May 20, 2026
PubMed
Summary
This summary is machine-generated.

Researchers boosted nonlinear optical processes using quantum light-bright squeezed vacuum (BSV) light. This quantum light achieved over 20x higher effective intensity than classical light, enabling enhanced strong-field dynamics and attosecond science applications.

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Area of Science:

  • Quantum Optics
  • Strong-Field Physics
  • Attosecond Science

Background:

  • Nonlinear optical processes are crucial for light-based technologies.
  • Higher light intensity enhances nonlinear effects but risks material damage.
  • Quantum light offers an alternative to intensity scaling for boosting nonlinear phenomena.

Purpose of the Study:

  • To experimentally demonstrate nonlinear optical processes enhanced by quantum light-bright squeezed vacuum (BSV).
  • To investigate the potential of BSV light in fundamental nonlinear processes like tunnelling ionization.
  • To establish a quantum-statistical method for controlling nonlinear light-matter interactions.

Main Methods:

  • Experimental nonlinear tunnelling ionization of isolated atoms using BSV.
  • Comparison of photoelectron momentum spectra generated by BSV and coherent light using angular streaking.
  • Tuning BSV effective intensity by adjusting the correlation function.

Main Results:

  • BSV light with 300 nJ pulse energy showed a >20-fold quantum boost in nonlinear effect compared to coherent light (7.1 μJ).
  • Effective intensity scaling was achieved by manipulating quantum correlations, not just classical intensity.
  • Angular streaking confirmed the enhanced nonlinear process via photoelectron momentum spectra.

Conclusions:

  • Quantum light-bright squeezed vacuum significantly enhances fundamental nonlinear optical processes.
  • This provides a quantum-statistical approach to control strong-field dynamics, bypassing classical intensity limitations.
  • Findings pave the way for quantum-controlled attosecond science and novel light-based applications.