Indistinguishability and interference in the coherent control of atomic and molecular processes

The Journal of Chemical Physics
Jiangbin Gong, Paul Brumer

Abstract

The subtle and fundamental issue of indistinguishability and interference between independent pathways to the same target state is examined in the context of coherent control of atomic and molecular processes, with emphasis placed on possible "which-way" information due to quantum entanglement established in the quantum dynamics. Because quantum interference between independent pathways to the same target state occurs only when the independent pathways are indistinguishable, it is first shown that creating useful coherence between nondegenerate states of a molecule for subsequent quantum interference manipulation cannot be achieved by collisions between atoms or molecules that are prepared in momentum and energy eigenstates. Coherence can, however, be transferred from light fields to atoms or molecules. Using a particular coherent control scenario, it is shown that this coherence transfer and the subsequent coherent phase control can be readily realized by the most classical states of light, i.e., coherent states of light. It is further demonstrated that quantum states of light may suppress the extent of phase-sensitive coherent control by leaking out some which-way information while "incoherent interference control" scenarios ...Continue Reading

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Citations

Jun 2, 2014·The Journal of Chemical Physics·Heekyung HanAlexei M Frolov
Nov 29, 2014·The Journal of Chemical Physics·Torsten Scholak, Paul Brumer
Jan 1, 2011·Faraday Discussions·Moshe Shapiro, Paul Brumer
May 17, 2011·Physical Review Letters·Moshe Shapiro, Paul Brumer

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