一个全光学量子控制的NOT门的演示
J L O'Brien1, G J Pryde, A G White
1Centre for Quantum Computer Technology, Department of Physics, University of Queensland, Brisbane 4072, Australia. job@physics.uq.edu.au
Nature
|November 25, 2003
概括
研究人员使用光学系统演示了一个量子控制NOT (CNOT) 门. 这一突破对于构建可扩展的全光学量子计算机至关重要,因为它能够实现基本的量子逻辑运算.
科学领域:
- 量子计算是一种量子计算.
- 量子信息科学是一种量子信息科学.
- 光学物理学的光学物理.
背景情况:
- 量子计算机承诺巨大的计算能力,推动了建造它们的努力.
- 实现量子计算机需要可扩展的量子比特 (qubits),精确控制初始化,测量和交互.
- 一组普遍的量子逻辑门,包括单量子位旋转和受控NOT (CNOT) 门,对于量子计算是必不可少的.
研究的目的:
- 在光学系统中实验证明和全面描述量子控制的NOT (CNOT) 门操作.
- 在单个网关条件下,根据输入量子位值显示所有四个纠的贝尔状态的生成.
- 为了确定概率光学CNOT门与线性光学量子非拆除测量对CNOT门的等价性,需要进行可扩展的全光学量子计算.
主要方法:
- 使用光学系统来实现量子逻辑运算.
- 产生纠的贝尔状态作为输入量子位逻辑值的函数.
- 使用线性光学量子非拆除测量.
主要成果:
- 一个明确的实验演示和对光学系统中的量子 CNOT 门操作的全面描述.
- 在单个操作条件下,成功地生产了所有四个纠的钟状态.
- 证明加上非拆除测量的概率光学CNOT门与可扩展全光学量子计算所需的CNOT门相当.
结论:
- 光学CNOT门的实验演示是朝着可扩展的全光学量子计算迈出的重要一步.
- 能够在一个单一的门条件下生成所有贝尔状态,这突出了门的多功能性.
- 线性光学量子非拆除测量的集成为光学系统中强大的量子信息处理提供了可行的途径.
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