Circuit quantum electrodynamics with a quadruple quantum dot

In this theoretical work, we describe a mechanism for the coupling between a plane structure consisting of four quantum dots and a resonator. We systematically study the dependence of the quadruple coupling strength and the qubit decoherence rate and point out the optimized operating position of the hybrid system. According to the transmission given by the input-output theory, the signatures in the resonator spectrum are predicted. Furthermore, based on the parameters already achieved in previous works, we prove that the device described in this paper can achieve the strong coupling limit, i.e., this approach can be used for system extension under the existing technical conditions. Our results show an effective and promotable approach to couple quantum dot structures in plane with the resonator and propose a meaningful extension method.

Automated summary

In this work, we propose a mechanism for coupling a plane structure of four quantum dots with a resonator. We investigate the dependence of the quadruple coupling strength and qubit decoherence rate, and identify the optimal operating position for the hybrid system. Using the input-output theory, we predict the signatures in the resonator spectrum. Additionally, based on previous research, we demonstrate that the device described in this paper can achieve the strong coupling limit, allowing for system extension under existing technical conditions.