Guan Zhijin, Liu Renjie, Cheng Xueyun, Feng Shiguang, Zhu Pengcheng
School of Information Technology, Nantong University, Nantong 226019, China.
School of Computer Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China.
Entropy (Basel). 2023 May 26;25(6):855. doi: 10.3390/e25060855.
Crosstalk is the primary source of noise in quantum computing equipment. The parallel execution of multiple instructions in quantum computation causes crosstalk, which causes coupling between signal lines and mutual inductance and capacitance between signal lines, destroying the quantum state and causing the program to fail to execute correctly. Overcoming crosstalk is a critical prerequisite for quantum error correction and large-scale fault-tolerant quantum computing. This paper provides an approach for suppressing crosstalk in quantum computers based on multiple instruction exchange rules and duration. Firstly, for the majority of the quantum gates that can be executed on quantum computing devices, a multiple instruction exchange rule is proposed. The multiple instruction exchange rule reorders quantum gates in quantum circuits and separates double quantum gates with high crosstalk on quantum circuits. Then, time stakes are inserted based on the duration of different quantum gates, and quantum gates with high crosstalk are carefully separated in the process of quantum circuit execution by quantum computing equipment to reduce the influence of crosstalk on circuit fidelity. Several benchmark experiments verify the proposed method's effectiveness. In comparison to previous techniques, the proposed method improves fidelity by 15.97% on average.
串扰是量子计算设备中噪声的主要来源。量子计算中多条指令的并行执行会导致串扰，这会引起信号线之间的耦合以及信号线之间的互感和电容，破坏量子态并导致程序无法正确执行。克服串扰是量子纠错和大规模容错量子计算的关键前提。本文提出了一种基于多条指令交换规则和持续时间来抑制量子计算机中串扰的方法。首先，针对大多数可在量子计算设备上执行的量子门，提出了一种多条指令交换规则。该多条指令交换规则对量子电路中的量子门进行重新排序，并分离量子电路上具有高串扰的双量子门。然后，根据不同量子门的持续时间插入时间间隔，并在量子计算设备执行量子电路的过程中仔细分离具有高串扰的量子门，以减少串扰对电路保真度的影响。几个基准实验验证了所提方法的有效性。与先前的技术相比，所提方法平均将保真度提高了15.97%。
