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Bulletin of the American Physical Society

Coherent manipulation of matter-waves on femtosecond timescales

Philipp Wessels, Bernhard Ruff, Tobias Kroker, Markus Drescher, K. Sengstock, Juliette Simonet

Published Jun 4, 2021• 0 citations
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Exciton-polaritons perform as ideal carriers of macroscopic quantum coherence, which can be potentially manipulated through precisely shaping the driving laser field. However, the connection of the coherence properties between the pumping laser and the strongly coupled light-and-matter system is studied to a lesser extent. In this paper, we visualize the femtosecond dynamics of coherence transfer from the driving laser field to the resonantly excited exciton-polariton by an interferometric measurement. The resonant polaritons can effectively preserve the coherence of the pumping laser field in femtosecond timescales. At a high excitation strength, non-resonant polaritons appear at higher energies delayed by several picoseconds, without the phase coherence from the pump, which is understood by a coupled oscillator model. Our results offer the possibility of regulating the polariton coherence by finely shaping the external pump laser fields.
In coherent light-matter interactions the coherent state produced by the light pulse remains coherent during the entire period of observation. One of the well-known examples of such interactions is the Rabi oscillation—a periodic transfer of population in a two-level system induced by an external electromagnetic field. While these oscillations have been studied in light-matter interactions since the discovery of laser itself, most of the studies are limited to long wavelengths, typically ranging from microwave to visible radiation. Here, we discuss how such oscillations can be generated at shorter wavelengths, for example in the extreme ultraviolet domain, using intense femtosecond pulses from seeded free-electron lasers. When a two-level system is undergoing Rabi oscillations, it can be described via an ‘atom + photon’ dressed-state, the properties of which can be further manipulated to study quantum entanglement between massive particles. Our results offer opportunities to employ these intense laser pulses for generating and controlling coherent light-matter interactions across ultrashort timescales.