A trailer-mounted 87Sr optical lattice clock reaches a 2.1×10^-18 total systematic uncertainty, with a 4.0×10^-19 blackbody radiation shift uncertainty enabled by a cold copper interrogation shield.
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Transportable strontium lattice clock with $4 \times 10^{-19}$ blackbody radiation shift uncertainty
A trailer-mounted 87Sr optical lattice clock reaches a 2.1×10^-18 total systematic uncertainty, with a 4.0×10^-19 blackbody radiation shift uncertainty enabled by a cold copper interrogation shield.