最小的基塔耶夫链的单射平价读数
Nick van Loo1,2, Francesco Zatelli3,4, Gorm O Steffensen5
1QuTech, Delft University of Technology, Delft, The Netherlands. n.vanloo@tudelft.nl.
Nature
|February 11, 2026
概括
研究人员开发了一种新的量子电容技术,可以读出拓量子比特的平价. 这一突破使Majorana零模式的实时测量成为可能,这对于构建容错量子计算机至关重要.
科学领域:
- 量子计算是一种量子计算.
- 凝聚物质物理学 凝聚物质物理学
- 量子信息科学 量子信息科学
背景情况:
- 拓量子比特对量子信息进行非局部编码,使用Majorana零模式进行噪声保护.
- 在超导体的量子点中实现的基塔耶夫链,是实现拓量子比特的有希望的平台.
- 测量Majorana模式的费米离子平价对于量子比特运行至关重要,但在实验上具有挑战性.
研究的目的:
- 引入一种新的测量技术,用于读取Majorana零模式的平价值.
- 为了证明基于基塔耶夫链的拓量子位的实时平价读数.
- 为了解决量子计算中长期存在的实验挑战.
主要方法:
- 利用量子电容来合和测量两个Majorana零模式的平价.
- 通过随机电报切换观察到平价读数,具有毫秒尺度寿命.
- 采用同时电荷传感来确认电荷中立性和平价状态的不可区分性.
主要成果:
- 成功演示了Majorana零模式的费米离子平价实时读数.
- 实现了寿命超过一毫秒的平价读数,表明稳定的量子比特状态.
- 确认平价状态是负荷中立的,并且无法被探测到,而探测器不会合模式.
结论:
- 开发的量子电容技术为Majorana量子比特提供了必要的读取机制.
- 这种方法促进了时间域控制和对拓量子比特的操纵.
- 这些发现代表了朝着构建可靠和可扩展的量子计算机迈出的重要一步.
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