Cryogenic optical lattice clocks

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The CIPM list of recommended frequency standard values: guidelines and procedures (2018, background): “The lowest estimated uncertainties in the 10−18 range have been reported for the 87Sr optical lattice clock [55, 56], the 171Yb+ single-ion clock [57] or the 27Al+ quantum logic clock [58].”
JILA SrI optical lattice clock with uncertainty of 2.0×10−18 (2019, background): “Atomic clocks based on optical transitions have realized unprecedented levels of stability, reproducibility, and accuracy [1, 2, 3, 4, 5, 6].”
Search for New Physics with Atoms and Molecules (2017, background): “Note that one can still make relative comparison of two frequencies to much better precision than the Cs standard provides (Ushijima et al., 2015).”
Geodesy and metrology with a transportable optical clock (2017, unknown): “The influence of BBR on the clock frequency has been discussed elsewhere 3,4,34–36 .”
Frequency ratio of Yb and Sr clocks with 5 × 10−17 uncertainty at 150 seconds averaging time (2016, background): “3(2)×10 accounts for a transport distance that is 2−4 mm less for Yb than for Sr, with a positioning uncertainty of 1 mm for each clock.”
Synchronization of Distant Optical Clocks at the Femtosecond Level (2015, unknown): “[4] I.”
Microscopic Control and Detection of Ultracold Strontium in Optical-Tweezer Arrays (2018, background): “[36] Ichiro Ushijima, Masao Takamoto, Manoj Das, Takuya”