Frequency comparison of optical lattice clocks beyond the Dick limit

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Gravitational wave detection with optical lattice atomic clocks (2016, methodology): “Such a setup allows for correlated noise spectroscopy [27,28,30], which enables the Ramsey interrogation time T to be extended far beyond the laser coherence time (1 s) out to the atomic radiative lifetime (160 s).”
Frequency ratio of Yb and Sr clocks with 5 × 10−17 uncertainty at 150 seconds averaging time (2016, background): “t with our prior measurement27. The fractional uncertainty of 4.6×10−17 represents a 30-fold reduction compared to a previous direct measurement at NMIJ7, which yielded ℛNMIJ = 1.207 507 039 343 340 4(18). Our value deviates from ℛNMIJ by 1.5 times their stated uncertainty, but is well within the un”
Geopotential measurements with synchronously linked optical lattice clocks (2016, background): “of 𝛥𝜈RIKEN2−1⁄𝜈0= 1(1) stat ×10 -18 (blue dots), demonstrating the reproducibility of these clocks. On the other hand, the master-slave comparison shows a gravitational red shift 𝛥𝜈UT−RIKEN1⁄𝜈0=−1,653(7) tot ×10 -18 (red dots), where the uncertainty includes systematic and statistical errors. ”