Entanglement in Strong-Field Ionisation
Prof. Feng He
Shanghai Jiao Tong University
Ultrafast lasers make it possible to observe and control the development of quantum entanglement. In this talk, I will report on three kinds of entanglement triggered by strong lasers. (1) The single ionization of a Lithium atom leaves the Li⁺ in a superposition of spin triplet and spin singlet states, resulting in an orbital swap between the two bound electrons. Such orbital swap may suppress the high harmonic generation initiated by rescattering. (2) In the multiphoton resonant ionization of Ar, the photoelectron entangles with the parent ion. By designing a pump-probe strategy, we may control the angular distribution of the photoelectron, which reflects its purity. (3) Using a bright squeezed light to ionize a hydrogen atom, the photoelectron entangles with the photons. We show how this entanglement modifies the photoelectron energy spectra.
References:
1. Zhao-Han Zhang, Yang Li, Yi-Jia Mao, and Feng He, Computer Physics Communications 290, 108787 (2023)
2. Jiang H, Zhang ZH, Li Y, Ruiz C, He F., Ultrafast Sci. 3: 0028 (2023).
3. Yu-Ning Yang, et al., Phys. Rev. Lett. 131, 183201 (2023)
4. Zhao-Han Zhang, et al., Phys. Rev. Lett. 136, 013204 (2026)
5. Zhao-Han Zhang, et al., Phys. Rev. Research 8, 013016 (2026)
6. Yi-Jia Mao, et al., Light Sci. Appl. (2026) (in press)
7. Yi-Jia Mao, et al., submitted
Shanghai Jiao Tong University
Ultrafast lasers make it possible to observe and control the development of quantum entanglement. In this talk, I will report on three kinds of entanglement triggered by strong lasers. (1) The single ionization of a Lithium atom leaves the Li⁺ in a superposition of spin triplet and spin singlet states, resulting in an orbital swap between the two bound electrons. Such orbital swap may suppress the high harmonic generation initiated by rescattering. (2) In the multiphoton resonant ionization of Ar, the photoelectron entangles with the parent ion. By designing a pump-probe strategy, we may control the angular distribution of the photoelectron, which reflects its purity. (3) Using a bright squeezed light to ionize a hydrogen atom, the photoelectron entangles with the photons. We show how this entanglement modifies the photoelectron energy spectra.
References:
1. Zhao-Han Zhang, Yang Li, Yi-Jia Mao, and Feng He, Computer Physics Communications 290, 108787 (2023)
2. Jiang H, Zhang ZH, Li Y, Ruiz C, He F., Ultrafast Sci. 3: 0028 (2023).
3. Yu-Ning Yang, et al., Phys. Rev. Lett. 131, 183201 (2023)
4. Zhao-Han Zhang, et al., Phys. Rev. Lett. 136, 013204 (2026)
5. Zhao-Han Zhang, et al., Phys. Rev. Research 8, 013016 (2026)
6. Yi-Jia Mao, et al., Light Sci. Appl. (2026) (in press)
7. Yi-Jia Mao, et al., submitted
