Probing dressed states and quantum nonlinearities in a strongly coupled three-qubit waveguide system under optical pumping

• URL: http://arxiv.org/abs/2209.10403v4
• Date: Thu, 28 Sep 2023 18:25:06 GMT
• Title: Probing dressed states and quantum nonlinearities in a strongly coupled three-qubit waveguide system under optical pumping
• Authors: Sofia Arranz Regidor and Stephen Hughes
• Abstract summary: We study a three-qubit waveguide system in the presence of optical pumping. We show how a rich nonlinear spectrum is obtained by varying the relative decay rates of the mirror qubits. We also show how the excited three qubit system, in a strong coupling regime, deviates significantly from a Jaynes-Cummings model when entering the nonlinear regime.
• Score: 0.7770029179741429
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study a three-qubit waveguide system in the presence of optical pumping, when the side qubits act as atomlike mirrors, manifesting in a strong light-matter coupling regime. The qubits are modelled as Fermionic two-level systems, where we account for important saturation effects and quantum nonlinearities. Optically pumping this system is shown to lead to a rich manifold of dressed states that can be seen in the emitted spectrum, and we show two different theoretical solutions using a medium-dependent master equation model in the Markovian limit, as well as using matrix product states without invoking any Markov approximations. We demonstrate how a rich nonlinear spectrum is obtained by varying the relative decay rates of the mirror qubits as well as their spatial separation, and show the limitations of using a Markovian master equation. Our model allows one to directly model giant-atom phenomena, including important retardation effects and multi-photon nonlinearities. We also show how the excited three qubit system, in a strong coupling regime, deviates significantly from a Jaynes-Cummings model when entering the nonlinear regime.

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