Seminar by Simone Felicetti on March 14th 2023.

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We are pleased to announce a seminar by Dr.Simone Felicetti, from CNR Rome, Italy.
The seminar will be held in Sala Lauree on Tuesday March 14, 2023, 3:00 PM.

Waveguide QED with Quadratic Light-Matter Interactions

Abstract
Quadratic light-matter interactions are nonlinear couplings such that quantum emitters interact with photonic or phononic modes exclusively via the exchange of excitation pairs. Implementable with atomic and solid-state systems, these couplings lead to a plethora of phenomena that have been characterized in the context of cavity QED, where quantum emitters interact with localized bosonic modes. Here, we explore quadratic interactions in a waveguide QED setting, where quantum emitters interact with propagating fields confined in a one-dimensional environment. We develop a general scattering theory under the Markov approximation and discuss paradigmatic examples for spontaneous emission and scattering of biphoton states. Our analytical and semi-analytical results unveil fundamental differences with respect to conventional waveguide QED systems such as the generation of correlated two-photon states directly via spontaneous emission or the full transparency of the emitter to single-photon inputs. This unlocks new opportunities in quantum information processing with propagating photons. For instance, we show that a single quadratically-coupled emitter can implement a two-photon logic gate with unit fidelity, circumventing a no-go theorem derived for conventional waveguide-QED interactions.