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Center for Nonlinear Studies |
The interaction between a collection of atoms and light can be cooperatively modified via quantum correlations between the atoms. Such cooperative light-matter interaction can be understood as a constructive or destructive interference between the atomic dipoles and the emitted radiation, which manifests as an enhancement (superradiance) or suppression (subradiance) of the total spontaneous emission from the atomic ensemble.In this talk I will present an overview of collective atom-field interactions going from short interatomic separations to distances comparable to coherence length of the emitted photons, wherein the memory effects of the intermediary electromagnetic environment become pronounced. We demonstrate that such a system can exhibit surprisingly rich non-Markovian dynamics, with collective spontaneous emission rates exceeding those of Dicke superradiance (`superduperradiance'), formation of highly delocalized atom-photon bound states and spontaneous generation of emitter-emitter entanglement in the presence of delay. Our results are pertinent to analyzing retardation effects in quantum networks and distributed quantum sensing protocols based on long-distance emitters.
Bio: Kanu Sinha is an Assistant Professor at the School of Electrical, Energy and Computer Engineering at Arizona State University. Prior to joining ASU, she was an Associate Research Scholar at the Department of Electrical and Computer Engineering at Princeton University. She earned her Bachelors of Technology in Engineering Physics at the Indian Institute of Technology, New Delhi, followed by her Ph.D. in Physics at University of Maryland, College Park. She has since been a Postdoctoral Fellow at the Institute of Quantum Optics and Quantum Information (IQOQI) in Innsbruck, Austria and at the US Army Research Laboratory (ARL) in Maryland.Her research group studies Quantum Optics and Quantum Information – with a focus on quantum fluctuation phenomena, collective atom-field interactions and non-Markovian open quantum systems. Her work aims to find novel ways to control atom-photon interactions in engineered quantum systems, with the goal to develop efficient light-matter interfaces and create scalable quantum devices.
Host: Yigit Subasi