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This paper develops a fully quantum theory of time-resolved transient absorption spectroscopy, showing how quantum correlations in probe light can couple to coherences in a target material. It is theoretical work with no hardware or experimental results yet. For quantum readers, the relevant point is whether quantum light can beat classical limits on resolving ultrafast dynamics, which remains to be tested experimentally.
Time-resolved transient absorption spectroscopy with quantum light
arXiv:2610.26041v1 Announce Type: new Abstract: We present a fully quantum theory of time-resolved transient absorption spectroscopy, providing a general framework for describing the linear response of a nonequilibrium target to quantum probe fields beyond the semiclassical approximation. We elucidate how quantum correlations between probe-field frequency modes couple to coherences in the target and derive a simple expression for computing the resulting spectroscopic signals. We identify conditions under which quantum light can modify transient absorption spectra beyond the limits achievable with classical fields. Our work establishes a theoretical foundation for exploiting quantum light in ultrafast spectroscopy and suggests new routes for resolving dynamics in matter on timescales shorter than the duration of the probe pulse.
Abstract:We present a fully quantum theory of time-resolved transient absorption spectroscopy, providing a general framework for describing the linear response of a nonequilibrium target to quantum probe fields beyond the semiclassical approximation. We elucidate how quantum correlations between probe-field frequency modes couple to coherences in the target and derive a simple expression for computing the resulting spectroscopic signals. We identify conditions under which quantum light can modify transient absorption spectra beyond the limits achievable with classical fields. Our work establishes a theoretical foundation for exploiting quantum light in ultrafast spectroscopy and suggests new routes for resolving dynamics in matter on timescales shorter than the duration of the probe pulse.
Quantum Physics (quant-ph); Atomic Physics (physics.atom-ph)
arXiv:2610.26041 [quant-ph]
(or arXiv:2610.26041v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2610.26041 Focus to learn more arXiv-issued DOI via DataCite
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