High-harmonic generation by a bright squeezed vacuum

Rasputnyi, Andrei

doi:10.1038/s41567-024-02659-x

High-harmonic generation by a bright squeezed vacuum

2024-10-02

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DOI：10.1038/s41567-024-02659-x

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High-harmonic generation has been driving the development of attosecond science and sources. More recently, high-harmonic generation in solids has been adopted by other communities as a method to study material properties. However, so far high-harmonic generation has only been driven by classical light, despite theoretical proposals to do so with quantum states of light. Here we observe non-perturbative high-harmonic generation in solids driven by a macroscopic quantum state of light, a bright squeezed vacuum, which we generate in a single spatiotemporal mode. The process driven by a bright squeezed vacuum is considerably more efficient in the generation of high harmonics than classical light of the same mean intensity. Due to its broad photon-number distribution, covering states from 0 to 2 x 1013 photons per pulse, and strong subcycle electric field fluctuations, a bright squeezed vacuum gives access to free carrier dynamics within a much broader range of peak intensities than accessible with classical light. High-harmonic generation has so far been driven only by classical light. Now, its driving by a bright squeezed vacuum-a quantum state of light-has been observed and shown to be more efficient than using classical light.

Keywords:

SPECTROSCOPY

ENTANGLEMENT

RADIATION

ELECTRONS

PULSES

MICRO

FIELD

High-harmonic generation by a bright squeezed vacuum

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