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Bulletin of the American Physical Society

Two $^{87}$Sr lattice clocks with $10^{-17}/\sqrt{\tau}$ level stability

Lindsay Sonderhouse, Eric Glenn Oelker, Tobias Bothwell, Ross B. Hutson, Colin J. Kennedy, Edward Marti, Dhruv Kedar, Akihisa Goban, Sarah Bromley, Sara Campbell, John Martin Robinson, William R. Milner, Shimon Kolkowitz, Christian Sanner, Dan Gh. Matei, Thomas Legero, F. Riehle, Uwe Sterr, Jun Ye

Published May 29, 2018• 0 citations
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Two 87^{87}87Sr lattice clocks with 10−17/τ10^{-17}/\sqrt{\tau}10−17/τ​ level stability
Comparison of Two Sr Optical Lattice Clocks with 10−17/τ10^{-17}/\sqrt{\tau}10−17/τ​ Level Stability
We present a comprehensive study of the frequency shifts associated with the lattice potential in a Sr lattice clock by comparing two such clocks with a frequency stability reaching 5×10(-17) after a 1 h integration time. We put the first experimental upper bound on the multipolar M1 and E2 interactions, significantly smaller than the recently predicted theoretical upper limit, and give a 30-fold improved upper limit on the effect of hyperpolarizability. Finally, we report on the first observation of the vector and tensor shifts in a Sr lattice clock. Combining these measurements, we show that all known lattice related perturbations will not affect the clock accuracy down to the 10(-17) level, even for lattices as deep as 150 recoil energies.