A Cryogenic Controller IC for Superconducting Qubits with DRAG Pulse Generation by Direct Synthesis without Using Memory

📋 论文概要

本文提出一种用于超导量子比特的低温控制器IC，通过直接合成方式无需存储器即可生成DRAG脉冲，解决了在相干时间内实现高速高保真度量子门操作对短脉冲（<20ns）的严苛需求。

💡 主要创新点

• 首次采用直接合成方法生成DRAG脉冲，无需使用大容量存储器，降低了芯片面积和功耗，适用于低温环境。
• 实现了小于20ns的微波脉冲驱动，满足超导量子比特在约100μs相干时间内进行大量高保真度门操作的需求。
• 芯片工作在4K低温级，支持可扩展的量子计算控制系统架构。

🏷 关键词

📄 原文摘要

superconducting qubits foresee reaching the next milestones of the exponentially growing number of qubits. The promises in the scalability present opportunities in integrated control electronics operating at 4K stage in the dilution refrigerator. In addition to the number of physical qubits, however, commercialization necessitates a further increase in the number of consecutive high-fidelity gate operations within a coherence time of ~100 µs. It leads to the stringent requirement on the duration of qubit-driving microwave pulse (i.e., < 20ns). The microwave pulses should only drive |0⟩ ↔ |1⟩ for single qubit gate operations while avoiding leakage to |1⟩ ↔ |2⟩ which is the major factor that degrades the gate fidelity. The frequency for |1⟩ ↔ |2⟩, ω12, is typically lower than

👥 作者与机构

Kiseo Kang, Donggyu Minn, Jaeho Lee, Ho-Jin Song, Moonjoo Lee, Jae-Yoon Sim

Pohang University of Science and Technology, Pohang, Korea Recent achievements in the physical size of quantum computers based on