Additional data for the publication "Long-distance chronometric leveling with a portable optical clock"

We have measured the geopotential difference between two locations separated by 457 km by comparison of two optical lattice clocks via an interferometric fiber link, utilizing the gravitational redshift of the clock transition frequency. The 87⁢Sr clocks have been compared side-by-side before and after one of the clocks was moved to the remote location. The chronometrically measured geopotential difference of 3918.1⁢(2.6) ⁢m2 s−2 agrees with an independent geodetic determination of 3915.88⁢(0.30) ⁢m2 s−2. The uncertainty of the chronometric geopotential difference is equivalent to an uncertainty of 27 cm in height.

我们通过干涉光纤链路（interferometric fiber link）比对两台光晶格钟（optical lattice clocks），利用钟跃迁频率的引力红移（gravitational redshift），测量了相距457公里的两个地点之间的重力位差。在其中一台钟被移至远端地点前后，我们对两台锶-87（⁸⁷Sr）钟进行了并排比对。计时学测量得到的重力位差为3918.1（2.6）m²/s²，与独立大地测量测定的3915.88（0.30）m²/s²结果一致。计时学重力位差的不确定度相当于高度上27厘米的不确定度。