Report title: High harmonic generation driven by quantum light

Reporting location:at lecture hall E310 in the north campus of GTIIT

Reporting time: November 5, 2024 17:00

Reporter: Oren Cohen (Guangdong Technion Israel Institute of Technology, Shantou 515063, China.Technion-Israel Institute of Technology, Haifa 32000, Israel)

Summary of the report:

For decades, high-harmonic generation (HHG) has been driven by classical laser light to generate useful extreme ultraviolet coherent radiation and attosecond pulses for investigating ultrafast phenomena in materials. Following the highly successful 3-step model of HHG, it was largely assumed that the electron trajectories are determined by the strong electric field amplitude that oscillates in time, while its quantum noise plays no role. I will present recent theoretical [1-4] and experimental [5] studies, demonstrating that quantum driving light alters the quantum and classical properties of HHG, e.g., leading to squeezed harmonics. The new formalism and experiments show that HHG exists even for driving light with noise so strong to nullify the field expectation values, such as bright squeezed vacuum.

1. Even Tzur, M., Birk, M., Gorlach, A., Krüger, M., Kaminer, I., & Cohen, O. Photon-statistics force in ultrafast electron dynamics. Nature Photonics, 17, 501, 2023.

2. Gorlach, A., Tzur, M.E., Birk, M., Krüger, M., Rivera, N., Cohen, O., & Kaminer, I. High-harmonic generation driven by quantum light. Nature Physics, 19, 1689, 2023.

3. Even Tzur, M., & Cohen, O. Motion of charged particles in bright squeezed vacuum. Light: Science & Applications, 13, 41, (2024)

4. Rasputnyi, A., Chen, Z., Birk, M., Cohen, O., Kaminer, I., Krüger, M., Seletskiy, D., Chekhova, M., & Tani, F. (2024). High harmonic generation by bright squeezed vacuum. Nature Physics (2024)