引力波探测器使用数公里长的干涉仪来测量时空的微小膨胀和收缩。由于量子力学的原因，这些测量的精度是有限的。理论上，利用光的压缩态可以超越量子极限，而合适的滤光腔可以在更宽的频率范围内扩展这一优势。

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According to a news release from AVIC, the first AS700 was delivered to Guangxi Guilin Fangzhou General Aviation, a private ...

Aviation Industry Corp of China, the nation's leading aircraft maker, has delivered the AS700 multipurpose civilian airship ...

北京时间9月19日（周四）凌晨， 联储9月FOMC以11:1通过降息50bp的决议，基准利率降至4.75%-5%，决议声明、点阵图以及鲍威尔讲话显示，在通胀风险下降的情况下，联储希望更快调整货币政策立场以避免就业市场进一步走弱， ...