Related papers: Waveguide QED with Quadratic Light-Matter Interactions

Waveguide QED with Quadratic Light-Matter Interactions

URL: http://arxiv.org/abs/2303.07382v2
Date: Mon, 11 Sep 2023 13:53:11 GMT
Title: Waveguide QED with Quadratic Light-Matter Interactions
Authors: Uesli Alushi, Tom\'as Ramos, Juan Jos\'e Garc\'ia-Ripoll, Roberto Di Candia and Simone Felicetti
Abstract summary: We show that a single quadratically-coupled emitter can implement a two-photon logic gate with unit fidelity. This unlocks new opportunities in quantum information processing with propagating photons.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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 spontaneous emission of frequency-entangled photon pairs or the full transparency of the emitter to single-photon inputs. This unlocks new opportunities in quantum information processing with propagating photons. As a striking example, 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.

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