• CQuIC Seminars

February 5, 2026 3:30 PM - February 5, 2026 4:30 PM
PAIS 2540

Host:

Paco Salces

Presenter:

Kanu Sinha

Zoom Link

Abstract: 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. 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. I will discuss the advantages of such non-Markovian dynamics towards sensing field distributions. As a spatially varying field influences the atoms (e.g., by inducing a relative frequency detuning in the atomic transitions), we demonstrate that time-delayed feedback can enhance the quantum Fisher information associated with field gradient sensing. Our results present a new avenue for atom-based gradiometric sensors, utilizing non-Markovian features of the electromagnetic environment.

Zoom password availible upon request, email nlordi AT unm.edu