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 x 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.
Lattice-Induced Frequency Shifts in Sr Optical Lattice Clocks at the 10-17 Level / P. G., Westergaard; J., Lodewyck; Lorini, Luca; A., Lecallier; E. A., Burt; M., Zawada; J., Millo; AND P., Lemonde. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 106:(2011), pp. 210801-210801. [10.1103/PhysRevLett.106.210801]
Lattice-Induced Frequency Shifts in Sr Optical Lattice Clocks at the 10-17 Level
LORINI, LUCA;
2011
Abstract
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 x 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
