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arXiv 1407.0653quant-ph
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利用$2N$端口分离器和相位翻转抑制高斯记忆信道上传输的信号中的相关噪声

Suppressing correlated noise in signals transmitted over the Gaussian memory channels using $2N$-port splitter and phase flips

Ke-Xia Jiang, Shi-Quan Zhang, San-Min Ke, Heng Fan

备注：
10 pages, 23 figures. Accepted version, accepted for publication in Phys. Rev. A
发表信息：
Phys. Rev. A 90, 052320 (2014)
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摘要：

提出了一种抑制玻色高斯记忆信道中相关噪声的方法。这是一个折衷的解决方案，而不是完全消除噪音。该方案基于线性光学元件、两个$N$端口分束器和$N$数目的相位翻转。该方案的优点是记忆通道的相关噪声得到了很大的抑制，并且在噪声通道上传输时，能够很好地保护输入信号的状态。我们研究了该方案对相关噪声的抑制效率，包括通过噪声信道直接传输的态的量子信息和纠缠隐形传态。相位翻转是抑制相关噪声的重要方面，它使量子信息通信中的记忆因子从完全负的角色转变为正的角色。增加分束器的数目也可以提高该方案在通信中的抑制效率。

英文摘要：

A scheme for suppressing the correlated noise in signals transmitted over the bosonic Gaussian memory channels is proposed. This is a compromise solution rather than removing the noise completely. The scheme is based on linear optical elements, two $N$-port splitters and $N$ number of phase flips. The proposed scheme has the advantages that the correlated noise of the memory channels are greatly suppressed, and the input signal states can be protected excellently when transmitting over the noise channels. We examine the suppressing efficiency of the scheme for the correlated noise, both from quantum information of the states directly transmitted through the noise channel and also from the entanglement teleportation. The phase flips are very important aspects for the suppressions of the correlated noise, which transform the roles of the memory factor from completely negative to positive in quantum information communications. Increasing the number of beam splitters also can improve the suppressing efficiency of the scheme in communications.

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