Observation of Quantum Interference and Coherent Control in a Photochemical Reaction

Physical Review Letters
David B BlasingYong P Chen

Abstract

Coherent control of reactants remains a long-standing challenge in quantum chemistry. In particular, we have studied laser-induced molecular formation (photoassociation) in a Raman-dressed spin-orbit-coupled ^{87}Rb Bose-Einstein condensate, whose spin quantum state is a superposition of multiple bare spin components. In contrast to the notably different photoassociation-induced fractional atom losses observed for the bare spin components of a statistical mixture, a superposition state with a comparable spin composition displays the same fractional loss on every spin component. We interpret this as the superposition state itself undergoing photoassociation. For superposition states induced by a large Raman coupling and zero Raman detuning, we observe a nearly complete suppression of the photoassociation rate. This suppression is consistent with a model based upon quantum destructive interference between two photoassociation pathways for colliding atoms with different spin combinations. This model also explains the measured dependence of the photoassociation rate on the Raman detuning at a moderate Raman coupling. Our work thus suggests that preparing atoms in quantum superpositions may represent a powerful new technique to cohe...Continue Reading

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Citations

Nov 10, 2020·Physical Chemistry Chemical Physics : PCCP·Sumit Suresh KaleSabre Kais
Jan 13, 2021·Journal of Cheminformatics·Xiangyue LiuJesús Pérez-Ríos
Nov 18, 2021·Journal of Chemical Theory and Computation·Sumit Suresh KaleSabre Kais

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