用日志深度量子电路准备矩阵产品状态
Daniel Malz1, Georgios Styliaris2,3, Zhi-Yuan Wei2,3
1Department of Mathematical Sciences, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
Physical review letters
|February 9, 2024
概括
在量子设备上准备矩阵产品状态 (MPS) 需要对数回路深度. 使用重新规范化-组转换的最佳算法实现了这一点,测量为任意MPS提供指数加速度.
科学领域:
- 量子计算是一种量子计算.
- 量子信息理论就是量子信息理论.
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 矩阵产品状态 (MPS) 对于模拟量子系统至关重要.
- 在量子硬件上有效准备MPS是一个关键的挑战.
- 当前的方法对于大型系统可能缺乏可扩展性.
研究的目的:
- 确定准备翻译不变的正常MPS的基本极限.
- 为MPS准备开发一个最佳的量子电路算法.
- 探索测量和反在加速MPS合成中的作用.
主要方法:
- 使用理论分析证明电路深度的下限.
- 开发一个基于重规范化组的算法,用于MPS准备.
- 将测量和反机制纳入量子电路.
主要成果:
- 建立了 Ω ((log N) 电路深度的下限,用于准备 N 位点转换不变的正常 MPS.
- 引入了一个具有O[log(N/ε) ]深度的最佳算法,用于MPS准备与误差 ε.
- 通过测量和反,证明了向O[loglog(N/ε) ]深度的指数加速度.
- 表明测量可以准备任意转换不变的MPS.
结论:
- 开发的算法为量子设备上的MPS准备提供了最佳和高效的方法.
- 测量和反是增强量子状态准备速度和多功能性的强大工具.
- 该算法的可扩展性到不均的MPS扩大了其在量子模拟中的适用性.
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