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Fall 2020

December 8, 2020

Dr. Kanu Sinha

Collective effects in emitters coupled to waveguides

(Host: Hal Metcalf)

Collections of atoms and solid-state quantum emitters coupled to waveguides and nanophotonic structures offer a promising platform for several quantum information applications. When interfacing small quantum systems and surfaces at nanoscales, fluctuation-induced phenomena such as vacuum forces, surface-modified dissipation and decoherence become an inevitable element of consideration. The need to achieve better control and coherence of photonic systems at that scale therefore requires a detailed understanding of these phenomena. In this talk, I will present an overview of various ways to engineer fluctuation-induced phenomena in nanoscale quantum optical systems, and discuss the possibility of using cooperative effects to modify fluctuation-induced forces.

Furthermore, when connecting multiple emitters prepared in correlated collective states at long distances, memory effects of the electromagnetic environments often become pronounced, necessitating a non-Markovian treatment of the system. I will discuss the collective atom-field interactions in a model system of two distant correlated emitters 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 delocalized atom-photon bound states and frequency-comb-like features in the output spectrum.

[1] K. Sinha, B. P. Venkatesh, and P. Meystre, Collective effects in Casimir-Polder Forces,  Phys. Rev. Lett. 121, 183605 (2018).
[2] K. Sinha, P. Meystre, E. Goldschmidt, F. K. Fatemi, S. L. Rolson, and P. Solano, Non-Markovian Collective Emission from Macroscopically Separated Emitters, Phys. Rev. Lett. 124, 043603 (2020).