超电流时间分割复杂化与固态集成混合超导电子系统
Alessandro Paghi1, Laura Borgongino2, Simone Tortorella2,3
1Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, Italy. alessandro.paghi@nano.cnr.it.
Nature communications
|September 26, 2025
概括
低温信号的时间分割复杂化是使用新型超导体解复杂器实现的. 这一进步可以通过减少空间和冷却时间来更有效地测量量子设备.
科学领域:
- 量子计算是一种量子计算.
- 超导装置的超导器件
- 低温工程 低温工程是什么?
背景情况:
- 复杂化冷信号对于缩放量子设备测量至关重要.
- 目前的方法面临空间,冷却时间和设备密度的限制.
- 有效的信号路由对于复杂的量子系统是必不可少的.
研究的目的:
- 为了证明非散流超流的时间划分复杂化.
- 开发和测试电压控制的混合超导解复合器.
- 为了提高低温量子测量的效率和可扩展性.
主要方法:
- 使用Al电极,InAs通道和HfOx门绝缘体制造超导约瑟夫森场效应晶体管 (JoFET).
- 将JoFET集成到电压控制的混合超导解复合器中.
- 在50mK下测复器性能的表征,包括切换电流抑制,电阻增加,信号频率,切换频率,插入损失和开/关比.
主要成果:
- 每个JoFET都抑制了开关电流,在 -4.5V门电压下,电阻增加了20倍.
- 一个8输出的解倍器运行到100 MHz的信号频率和100 kHz的切换频率,输入范围为±2 μA.
- 实现了接近零的插入损失和17.5dB的开/关比.
- 优化布局扩展了运行到4 GHz,使用2输出分复制器.
结论:
- 超级电流的时间分割复杂化是可行的,使用混合超导脱复杂器.
- 开发的JoFETs和demultiplexers在冷信号路由中提供了显著的改进.
- 这项技术为更具可扩展性和高效的量子计算架构铺平了道路.
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