格罗弗的算法在一个四量子比特处理器中,超过了容错值.
I Thorvaldson1,2, D Poulos1, C M Moehle1
1Silicon Quantum Computing Pty Ltd, UNSW Sydney, Sydney, New South Wales, Australia.
Nature nanotechnology
|February 20, 2025
概括
研究人员使用量子处理器演示了一个三量子比特格罗弗的搜索算法. 量子计算的这一进步显示了复杂算法的高保真性,为可扩展的量子计算机铺平了道路.
科学领域:
- 量子计算是一种量子计算.
- 固态物理 固态物理
背景情况:
- 自旋量子比特对量子计算具有前景.
- 在保持高保真度的同时,扩大量子比特数量是一个重大挑战.
- 以前的工作仅限于两量子比特算法.
研究的目的:
- 为了在量子处理器上演示一个三量子比特格罗弗的搜索算法.
- 以增加量子比特数量来实现高保真度的量子运算.
- 探索使用自旋量子比特可扩展量子计算的潜力.
主要方法:
- 使用了四个量子比特的处理器与精确的原子.
- 由于很长的连贯时间,实现了高于99.9%的单量子位保真度.
- 实施了高效的单脉冲多量子比特操作,用于控制Z门的电子核超细相互作用.
主要成果:
- 成功执行了三量子比特格罗弗的搜索算法,成功概率为 ~95%.
- 在所有核旋转对之间展示了受控的Z门,其忠实度高于99%.
- 创建了一个三位量子比特的格林伯格-霍恩-齐林格状态,保真率为96.2%.
- 所有的控制保真度都高于容错值.
结论:
- 通过增加自旋量子比特的数量,可以实现高准确度的量子运算.
- 展示的处理器架构和控制方法适合执行多量子位算法.
- 通过电子-电子交换的核自旋寄存器的合为更大,更耐故障的量子处理器提供了一条道路.
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