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Repulsive photons in a quantum nonlinear medium

Author(s)
Cantu, Sergio H; Venkatramani, Aditya V; Xu, Wenchao; Zhou, Leo; Jelenković, Brana; Lukin, Mikhail D; Vuletić, Vladan; ... Show more Show less
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Abstract
© 2020, The Author(s), under exclusive licence to Springer Nature Limited. The ability to control strongly interacting light quanta (photons) is of central importance in quantum science and engineering1–5. Recently it was shown that such strong interactions can be engineered in specially prepared quantum optical systems6–10. Here, we demonstrate a method for coherent control of strongly interacting photons, extending quantum nonlinear optics into the domain of repulsive photons. This is achieved by coherently coupling photons to several atomic states, including strongly interacting Rydberg levels in a cold Rubidium gas. Using this approach we demonstrate both repulsive and attractive interactions between individual photons and characterize them by the measured two- and three-photon correlation functions. For the repulsive case, we demonstrate signatures of interference and self ordering from three-photon measurements. These observations open a route to study strongly interacting dissipative systems and quantum matter composed of light such as a crystal of individual photons11,12.
Date issued
2020
URI
https://hdl.handle.net/1721.1/132544
Journal
Nature Physics
Publisher
Springer Science and Business Media LLC

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