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2 August 2024 Quantum nonlinear response of few photon Fock-state pulses to a chiral-emitter waveguide-QED system
Sofia Arranz Regidor, Jacob Ewaniuk, Nir Rotenberg, Stephen Hughes
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Proceedings Volume PC13106, Photonics for Quantum 2024; PC131060P (2024) https://doi.org/10.1117/12.3027096
Event: Photonics for Quantum, 2024, Waterloo, Ontario, Canada
Abstract
The study of waveguide-QED systems, where a continuum of quantum field modes is coupled to qubits or two-level systems, has improved our ability to manipulate quantum light-matter interactions on chip. In the typical theoretical approaches to waveguide QED, there are a few necessary approximations, e.g., considering the system in the weak excitation regime, or treating the waveguide as a bath. However, these inherent approximations can break down with short pulse excitation. Here, we investigate the few-photon quantum nonlinear response of chiral qubits, when excited with one and two-photon Fock states. Our theory uses a numerically exact approach, based on Matrix Product States, avoiding the limitations of the usual waveguide-QED approximations. Using a chiral-emitter waveguide system, we show explicitly the breakdown of the weak excitation approximation, and study the single and two-photon nonlinear responses. We demonstrate the impact on the qubit population, and discuss how the phase change can be examined from the photon quantum correlation functions, seeing a radical departure from scattering theory solutions.
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Sofia Arranz Regidor, Jacob Ewaniuk, Nir Rotenberg, and Stephen Hughes "Quantum nonlinear response of few photon Fock-state pulses to a chiral-emitter waveguide-QED system", Proc. SPIE PC13106, Photonics for Quantum 2024, PC131060P (2 August 2024); https://doi.org/10.1117/12.3027096
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KEYWORDS
Waveguides
Quantum systems
Nonlinear response
Complex systems
Quantum communications
Light-matter interactions
Quantum coherence
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