The variational quantum eigensolver (VQE) is a promising candidate that brings practical benefits from quantum computing. However, the required bandwidth in/out of a cryostat is a limiting factor to scale cryogenic quantum computers. We propose a tailored counter-based module with single flux quantum circuits in 4-K stage which precomputes a part of VQE calculation and reduces the amount of inter-temperature communication. The evaluation shows that our system reduces the required bandwidth by 97%, and with this drastic reduction, total power consumption is reduced by 93% in the case where 277 VQE programs are executed in parallel on a 10000-qubit machine.

翻译：变分量子本征求解器（VQE）是实现量子计算实用化前景的重要候选方案。然而，低温恒温器所需的数据带宽成为制约低温量子计算机规模扩展的关键因素。我们提出了一个定制化的基于计数器的模块，该模块在4K温区采用单磁通量子电路，通过预计算VQE计算中的部分任务来降低跨温区通信量。评估结果表明，该系统可将所需带宽降低97%；基于这一显著降幅，在10000量子比特机器上并行执行277个VQE程序时，总功耗可降低93%。