论文标题
具有10-18不稳定的微波频率的相干光钟下转换
Coherent Optical Clock Down-Conversion for Microwave Frequencies with 10-18 Instability
论文作者
论文摘要
由于稳定性和准确性比当前的微波原子钟标准好了一百多倍，因此光学原子时钟有望重新定义SI第二。但是，最好的光学时钟尚未看到它们的性能转移到电子域，雷达，导航，通信和基本研究依赖于较不稳定的微波源。通过比较两个独立的光学信号发电机，我们演示了一个10 GHz微波信号的相位，可以准确跟踪其得出的光学时钟相位的相位，从而在电子域中产生1*10-18的绝对分数频率不稳定性。光学时钟阶段的这种忠实繁殖扩大了技术和科学上的光学时钟的机会，以实现时间降低，导航和长基线干涉量学成像。
Optical atomic clocks are poised to redefine the SI second, thanks to stability and accuracy more than one hundred times better than the current microwave atomic clock standard. However, the best optical clocks have not seen their performance transferred to the electronic domain, where radar, navigation, communications, and fundamental research rely on less stable microwave sources. By comparing two independent optical-to-electronic signal generators, we demonstrate a 10 GHz microwave signal with phase that exactly tracks that of the optical clock phase from which it is derived, yielding an absolute fractional frequency instability of 1*10-18 in the electronic domain. Such faithful reproduction of the optical clock phase expands the opportunities for optical clocks both technologically and scientifically for time-dissemination, navigation, and long-baseline interferometric imaging.
