一个二量子位的逻辑门
M Veldhorst1, C H Yang1, J C C Hwang1
1Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, New South Wales 2052, Australia.
Nature
|October 6, 2015
概括
研究人员使用量子点中的单个旋转演示了高保真度的两量子位逻辑门. 这一突破推动了可扩展的量子计算,
科学领域:
- 量子计算
- 固态物理
- 量子信息科学
背景情况:
- 量子计算需要高可靠性量子比特和通用逻辑门.
- 现有的量子比特技术在适合制造的固态系统中面临着实现高可靠性双量子比特门的挑战.
- 半导体系统与量子位合和脱相相斗争, 限制了它们在量子计算中的应用.
研究的目的:
- 在量子点系统中实现的新两量子位逻辑门.
- 通过半导体量子位的交换交互来证明高可靠性双量子位门的可行性.
- 推进可扩展和可制造的量子计算硬件的开发.
主要方法:
- 在量子点系统中使用同位素丰富的.
- 通过Loss-DiVincenzo提出的交换互动实现单量子位和双量子位操作.
- 采用直接门电压控制以实现单量子位的定位性和可切换的交换互动以控制相门.
- 执行两个量子位的独立读取以验证网关性能.
主要成果:
- 通过控制相操作和单量子比特操作成功实现CNOT门.
- 展示可切换的交换交互,使两量子比特操作能够精确控制.
- 在两个旋转概率中测量明显的反相关性,确认 CNOT 门的准确性.
- 在固态系统中实现高准确度的双量子比特门,可通过标准光刻制造.
结论:
- 这种量子点系统为可扩展的量子计算提供了一个有前途的平台.
- 这项工作克服了在基于半导体的量子计算机中实现高可靠性双量子比特门的先前限制.
- 开发的门技术为构建强大且耐故障的量子处理器铺平了道路.
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