Superconducting quantum circuit chip-level simulation method based on Comsol

Abstract

The invention relates to the field of superconducting quantum circuit simulation, and particularly discloses a Comsol-based superconducting quantum circuit chip-level simulation method, which comprises the following steps of: constructing a full-circuit model of a superconducting quantum circuit; wherein the full-circuit model comprises all circuit elements of the superconducting quantum circuit and a packaging environment; selecting a physical field and adding physical field boundaries and port conditions to the whole circuit model based on circuit parameters of a target circuit element needing to be simulated; mesh generation is carried out; finite element solution is executed, and frequency domain analysis is carried out; extracting required circuit parameters from the analysis result; wherein the circuit parameters comprise inductance parameters, capacitance parameters and frequency parameters. Compared with a model formed by splicing geometric figures in the prior art, the full-circuit model adopted by the invention is easier to finely adjust and correct, and the adopted multi-physics coupling analysis is closer to the real working environment of the superconducting quantum circuit, so that the simulation result is closer to the actual circuit parameters.

Description

Technical field [0001] The invention relates to the field of superconducting quantum circuit simulation, and specifically relates to a Comsol-based superconducting quantum circuit chip-level simulation method. Background technique [0002] Superconducting quantum circuit is an artificial macroscopic quantum system composed of various circuit components, including SQUID, bypass capacitor, XY / Z control line, readout cavity, transmission line, etc. Superconducting quantum circuits are similar to analog circuits in classical integrated circuits, except that the computing units are qubits. A qubit is a macroscopic LC circuit composed of a SQUID and a bypass capacitor connected in parallel. The SQUID has a nonlinear inductance, causing the LC circuit to have a nonlinear potential. The energy levels are anharmonic. The lowest two energy levels are separable, thus encoding them into qubits. of the second energy level. The Josephson junction is the core part of SQUID. It has a thre...

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Problems solved by technology

[0005] Although this kind of microwave simulation software can also be used to design components of superconducting quantum circuits, there will be a problem: chip-level simulation cannot be performed

Although the current is very small and quickly flows out through the ground at the edge of the circuit, it will always disturb the circuit parameters of other devices and affect the final performance during this period. After all, the quantum signal itself is an extremely weak signal and requires extremely low temperature to suppress damage. ambient noise

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