Dynamical spectra from one and two-photon Fock state pulses exciting a single chiral qubit in a waveguide

• URL: http://arxiv.org/abs/2410.03715v1
• Date: Fri, 27 Sep 2024 20:51:37 GMT
• Title: Dynamical spectra from one and two-photon Fock state pulses exciting a single chiral qubit in a waveguide
• Authors: Sofia Arranz Regidor, Andreas Knorr, Stephen Hughes,
• Abstract summary: We study the dynamical light emission from few-photon Fock states in waveguide-QED with a chiral two-level system. We show how a 1-photon pulse yields a transmitted long-time spectrum that is identical to the input pulse, despite significant population effects. We also show the differences between 1-photon and 2-photon excitation, where the latter shows clear signatures of nonlinear saturation effects.
• Score: 0.5852077003870417
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study the dynamical light emission from few-photon Fock states in waveguide-QED with a chiral two-level system. We first investigate the time dynamics of the system by calculating the emitter population and illustrate the breakdown of the weak excitation approximation, for both 1-photon and 2-photon excitation. We show how a 1-photon pulse yields a transmitted long-time spectrum that is identical to the input pulse, despite significant population effects. However, the dynamical spectra and spectral intensity show rich population effects. We also show the differences between 1-photon and 2-photon excitation, where the latter shows clear signatures of nonlinear saturation effects. Analytical and numerically exact matrix product state solutions are shown.

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