# Freiburg 2019 – wissenschaftliches Programm

## Sitzungen | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# FM: Fall Meeting

## FM 22: Quantum Control

### FM 22.3: Talk

### Montag, 23. September 2019, 17:15–17:30, 3042

Coherent control of two-photon absorption via entangled photons — •Edoardo Carnio^{1}, Frank Schlawin^{2}, and Andreas Buchleitner^{1} — ^{1}Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germany — ^{2}Clarendon Laboratory, University of Oxford, United Kingdom

Coherent control exploits the coherence of classical light to drive an initial quantum state to a desired final state. In two-photon absorption (TPA), in particular, two photons are used to excite a molecule from the ground to an excited state. Under certain conditions, frequency-entangled photons drive the transition more efficiently than in the classical case [1]. We quantify the correlations in the state with the entropy of entanglement, which we compare to the enhancement of the transition. We perform this analysis in the two cases of finite and infinite interaction time.

[1] Schlawin, F. & Buchleitner, A. Theory of coherent control with quantum light. New J. Phys. 19, 013009 (2017).