用混合技术对光子量子位进行决定性量子传输
Shuntaro Takeda1, Takahiro Mizuta, Maria Fuwa
1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan.
Nature
|August 20, 2013
概括
光子量子比特的决定性量子传输现在可以在没有后选择的情况下实现. 混合技术确保了忠实的量子比特传输,超越了经典的限制,提高了量子通信的效率.
科学领域:
- 量子信息科学 量子信息科学
- 量子光学是一种量子光学.
- 量子通信是一种量子通信.
背景情况:
- 量子远程传输使用纠和经典通信转移量子状态.
- 光子量子比特非常适合量子通信,但面临着实验限制.
- 现有的方法受到概率测量和量子比特破坏/减弱的影响.
研究的目的:
- 通过实验证明光子量子比特的完全决定性量子传输.
- 克服以前的概率和选择后传输方法的局限性.
- 为了实现高保真度量子比特传输而不会破坏或减弱输入量子比特.
主要方法:
- 使用混合技术,结合连续变量和离散变量传输.
- 采用双轨编码的单光子量子比特.
- 优化接收器前增益,以创建纯损失通道.
主要成果:
- 在没有后选择的情况下,实现了光子量子比特的完全决定性量子传输.
- 证明了四个量子比特的忠实度从0.79到0.82,超过了经典的极限.
- 展示了高效的量子比特传输,即使有不完美的纠,与以前的选择后方法相比.
结论:
- 混合技术使得确定性的光子量子位传输成为可能,这对于量子网络来说是一个重大进步.
- 该方法提供了对光子损失的固有保护,保持量子比特完整性.
- 这项工作为更强大,更有效的量子通信协议铺平了道路.
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