Reconstruction of attosecond beating by interference of two-photon transitions is a cornerstone technique of attosecond chronoscopy, routinely used to extract photoemission delays from the phase of sideband oscillations. Here, we theoretically investigate the reconstruction of attosecond beating by interference of two-photon transitions protocol driven by quantum light and demonstrate that it is intrinsically sensitive to the quantum nature of the driving field. When the probe field is prepared in a nonclassical state, its photon statistics are imprinted onto photoelectrons via continuum-continuum transitions, giving rise to an additional time delay of several tens of attoseconds. We trace this delay to the phase associated with the second-order anomalous moment $⟨{\widehat{a}}^2⟩$ of the probe field. Extending the framework to a three-sideband configuration, which enables retrieval of the fourth-order anomalous moment $⟨{\widehat{a}}^4⟩$, we show that the interferometer exhibits significantly enhanced sensitivity to quantum fluctuations. Our work illustrates quantum attosecond photoelectron interferometry as a phase-sensitive probe of quantum light, offering a promising route for time-resolved quantum metrology at the attosecond scale.

Close

PrevNext

View figure in article

• Atomic & molecular processes in external fields
• Photoemission
• Quantum optics
• Quantum states of light
• Single- and few-photon ionization & excitation