超导量子芯片上磁场串扰抑制方法

Suppression method of magnetic field crosstalk on superconducting quantum chip

量子计算机的算力是由量子比特的数量和单比特的保真度共同决定的。超导量子芯片可采用类似半导体芯片的工艺进行制备,因而在可扩展性方面具有天然的优势。随着量子比特数量的增加,超导量子芯片上的z控制线(磁场控制线)也随之增加,导致各个控制线间的磁场串扰增加,从而影响单比特的保真度,并进一步影响超导量子计算的算力。针对以上问题,通过对超导量子芯片建模仿真,提出利用导流结构降低控制线间的磁场串扰,其仿真结果显示引入导流结构后,控制线间的磁场串扰得到明显改善。该工作为进一步抑制超导量子芯片z控制线间的磁场串扰提供了基础。

The computing power of a quantum computer is determined by the number of qubits and the fidelity of each bit.Superconducting quantum chip can be fabricated using a process similar to that of a semiconductor chip,so it has a natural advantage in scalability.However,as the number of quantum bits increases,the number of the z-control lines namely magnetic field control lines on the superconducting quantum chip also increases,resulting in the increase of magnetic field crosstalk among z-control lines.The fact would affect the fidelity of qubits and further affect the computation power of superconducting quantum computing.For the above problems,one method is proposed to reduce the magnetic field crosstalk among z-control lines by simulation in this paper.The simulation results show that the magnetic field crosstalk among control lines is significantly improved after the introduction of the diversion structure.This work provides a foundation for further suppressing the magnetic field crosstalk among z-control lines on the superconducting quantum chip.