Two-step frequency conversion for connecting distant quantum memories by transmission through an optical fiber
Two-step frequency conversion for connecting distant quantum memories by transmission through an optical fiber
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DOI：
10.7567/jjap.57.062801
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发表时间：
2018-04
影响因子：
1.5
通讯作者：
Shuhei Tamura;Kohei Ikeda;K. Okamura;K. Yoshii;F. Hong;T. Horikiri;H. Kosaka
中科院分区：
文献类型：
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作者：
Shuhei Tamura;Kohei Ikeda;K. Okamura;K. Yoshii;F. Hong;T. Horikiri;H. Kosaka
远距离量子通信需要遥远的量子存储器之间的纠缠。为此，光子传输是连接遥远的记忆所必需的。在这里，我们首次开发了两步变频过程（从可见光波长到电信波长并返回），涉及使用独立的双频转换介质，其中目标量子存储器是金刚石中的氮空位中心（具有637.2nm的发射/吸收波长），并且实验地表征作用于来自衰减的CW激光器的光的该过程的性能。实现了约7%的总转换效率。测量了频率转换过程中产生的噪声，并估计了由氮空位（NV）中心发射的单光子信号的信噪比。所开发的频率转换系统具有未来的应用，通过长光纤信道在电信波长的量子中继器网络的传输。
Long-distance quantum communication requires entanglement between distant quantum memories. For this purpose, photon transmission is necessary to connect the distant memories. Here, for the first time, we develop a two-step frequency conversion process (from a visible wavelength to a telecommunication wavelength and back) involving the use of independent two-frequency conversion media where the target quantum memories are nitrogen-vacancy centers in diamonds (with an emission/absorption wavelength of 637.2 nm), and experimentally characterize the performance of this process acting on light from an attenuated CW laser. A total conversion efficiency of approximately 7% is achieved. The noise generated in the frequency conversion processes is measured, and the signal-to-noise ratio is estimated for a single photon signal emitted by a nitrogen-vacancy (NV) center. The developed frequency conversion system has future applications via transmission through a long optical fiber channel at a telecommunication wavelength for a quantum repeater network.