Multi-scale modeling of quantum chip devices using ARTEMIS

Quantum devices with superconducting qubits are a promising technology in the realm of next-generation computing and information processing. However, as these systems grow in complexity, it has become critical to quantify losses or "crosstalk" errors between qubits and electromagnetic signals in the microwave resonators. These undesirable effects can occur at the cm-scale due to electromagnetic wave-interactions from the material interfaces in the circuit, or at the micrometer or nanometer length-scale caused by electromagnetic interference with the qubits. Designing efficient devices minimizing these interferences requires full-physical modeling of the circuit. We have developed a multi-scale electromagnetic code, ARTEMIS, for modeling the interaction of electromagnetic signals and the qubit components of the quantum circuit. ARTEMIS is a performance-portable software framework that solves Maxwell's equations using the finite-difference time-domain approach for realistic circuitry with heterogeneous materials. We will present our numerical approach towards coupling the Maxwell solver for electromagnetic signals and the classical London equation solver to study the non-linear effects of the superconducting qubits and quantify the performance of realistic quantum circuit components. These simulations will aid in the design optimization of circuit configurations.