Femtosecond spectroscopy with paired single photons: Emulating a double-slit experiment in the time-frequency domain.

ABSTRACT: Time-resolved spectroscopy has long served as a cornerstone technique for investigating the photophysics of materials. However, conventional methods based on intense optical pulses and ensemble measurements often fail to resolve quantum dynamics due to spectral overlap, coherent artifacts, and multiphoton effects. To overcome these limitations, single-photon transient stimulated emission (SP-TSE) has been proposed as a femtosecond spectroscopy technique using quantum light and detection principles. Here, we theoretically demonstrate frequency-resolved SP-TSE. Unlike semiclassical techniques, SP-TSE reveals a strong dependence of the time-resolved spectrum on the frequency-resolving method. With a tunable optical filter, the observed spectrum reflects a quantum double-slit interference in t

SUBMITTER: Hong E 

PROVIDER: S-EPMC12533565 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature