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实验性演示可扩展的交叉度基准测试,以检测超导量子处理器上的测量诱导的相位过渡
Hirsh Kamakari1, Jiace Sun1, Yaodong Li2
1California Institute of Technology, Division of Engineering and Applied Science, Pasadena, CA 91125, USA.
Physical review letters
|April 11, 2025
概括
研究人员展示了一种新的,可扩展的方法,使用交叉来检测量子系统中的纠相变. 这种方法避免了复杂的测量,使研究能够在更大的量子计算机上进行.
科学领域:
- 量子信息科学 量子信息科学
- 凝聚物质物理学 凝聚物质物理学
- 量子计算是一种量子计算.
背景情况:
- 量子系统中的纠阶段过渡受到随机测量的影响.
- 传统的表征方法,如纠,在计算上是昂贵的,对于近期的量子设备来说是不可扩展的.
- 现有的方法需要量子状态断层扫描和后选择,限制系统大小和实验可行性.
研究的目的:
- 用线性交叉来展示一个可扩展的协议,用于检测使用线性交叉的纠阶段过渡.
- 克服基于纠的表征的局限性,特别是需要后期选择.
- 为了能够研究更大的量子系统中测量诱导的纠相变.
主要方法:
- 在IBM量子硬件上实现线性交叉基准 (XEB) 协议.
- 实验设置涉及具有一维和全对全连接的量子系统.
- 使用最多22个量子比特的系统,这是以前无法达到的尺度,因为后选择要求.
主要成果:
- 数据的成功演示崩到理论缩放函数上.
- 观察到的临界指数与理论预测的半定量一致.
- 展示了XEB协议在当前量子硬件上的可行性,用于最多22个量子比特的系统.
结论:
- 交叉基准协议是一种可行的和可扩展的方法来检测纠阶段过渡.
- 这次演示为在更大,近期量子系统中研究复杂的量子现象开辟了新的途径.
- 这些发现为未来研究量子计算中测量诱导的纠和关键现象铺平了道路.
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