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Title: Collective Atom-Photon Interactions in Waveguide QED
Abstract: Collections of atoms and solid-state quantum emitters coupled to waveguides and nanophotonic structures offer a promising platform for scalable quantum information processing. The applications of such systems range from building longranged quantum networks, quantum memory devices, to facilitating new experimental regimes with exotic light-matter interactions. However, at large interatomic separations memory effects of the electromagnetic environments often become pronounced, rendering the dynamics of the system non-Markovian. In this talk I will present an overview of collective atom-field interactions going from atomic separations at short-distances (Markovian) to distances comparable to coherence length of the atomic emission (non-Markovian). Considering a model system of two correlated atoms coupled to a waveguide, 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 longdistance emitters.
Bio: Kanu Sinha is an Assistant Professor at the School of Electrical, Computer and Energy Engineering at Arizona State University since 2022. Prior to her appointment at ASU, she was an Associate Research Scholar at the Department of Electrical and Computer Engineering at Princeton University. She earned her Bachelor of Technology degree in Engineering Physics at the Indian Institute of Technology (IIT), New Delhi, followed by her Ph.D. in Physics at University of Maryland (UMD), 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 is in quantum optics and open quantum systems – with a focus on fluctuation phenomena, collective atom-field interactions and non-Markovian open quantum systems. While primarily a theorist, she collaborates closely with ongoing experiments with cold atoms coupled to optical nanofibers, solid-state quantum optics, and levitated nanoparticles.
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