SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster III
Q 42.11: Poster
Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof
A quantum Rabi model with two interacting qubits — •Thomas J. Hamlyn1,2 and Weibin Li1,2 — 1School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom — 2Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham NG7 2RD, United Kingdom
We study a modified quantum Rabi model with a monochromatic bosonic mode and two qubits coupled via a spin-spin interaction. We focus on eigenstates of the model in two different regimes. Without qubit mixing, the Hilbert space can be divided into two symmetry sectors. It is found that the model can be reduced to the standard Rabi model, and therefore the eigenenergy can be obtained systematically through solving the so-called G-function. With the qubit mixing, we study the superradiant phase transition with the mean field and direct diagonalization method, both giving consistent results. It is found that the symmetry of the ground state is broken. We explore the symmetry breaking by varying system parameters. Using a variety of methods, we show the dependence of the symmetry breaking on the qubit mixing