Nb/a-Si/Nb-junction 约瑟夫森任意波形合成器用于量子信息
David Olaya1, John Biesecker2, Manuel Castellanos-Beltran2
1Department of Physics at the University of Colorado, Boulder, CO; RF Technology Division of the National Institute of Standards and Technology, Boulder, CO, USA.
概括
我们开发了约瑟夫森任意波形合成器 (JAWS),使用外部调节的连接器,用于在4K以下的更广泛的操作温度范围.这种进步提高了温度稳定性,用于在冷环境中精确的量子比特控制和校准.
科学领域:
- 超导量子电子学超导量子电子学
- 低温工程 低温工程是什么?
- 量子计算硬件 量子计算硬件
背景情况:
- 约瑟夫森任意波形合成器 (JAWS) 对于控制超导量子比特至关重要.
- 传统的JAWS使用自动转接口,限制了它们的操作温度范围和稳定性.
- 对于先进的量子应用,需要提高温度稳定性和电路密度.
研究的目的:
- 为了展示约瑟夫森任意波形合成器 (JAWS),其增强的操作温度范围低于4K.
- 通过使用外部转向的接口来提高JAWS的温度稳定性.
- 开发用于量子比特控制和校准的高密度JAWS电路.
主要方法:
- 制造Nb/a-Si/Nb约瑟夫森连接器与外置的PdAu电阻器.
- 开发垂直螺杆电阻,用于百万欧姆的分流电阻和紧的足迹.
- 设计,制造和测试一个JAWS电路,有4650个堆叠的连接点.
- 从3.8K到20mK的电阻性能评估.
主要成果:
- 与自动转向连接器相比,外部转向连接器具有更好的临界电流温度稳定性.
- 垂直螺杆电阻可以实现所需的分流电阻,其足迹小,适合高密度阵列.
- 经过测试的JAWS电路有4650个堆叠的连接点显示稳定运行和Shapiro步骤.
- 性能评估低至20mK,证明适用于量子比特控制阶段.
结论:
- 外接的Nb/a-Si/Nb接口为JAWS在4K以下提供了增强的温度稳定性.
- 新型垂直螺杆电阻使JAWS电路的高密度集成成为可能.
- 开发的JAWS技术适用于在千基凯尔文温度下精确控制和校准量子比特.
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