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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