331 citations · 1.7k across the 18 of their papers we have counts for
18 papers
Transportable Optical Lattice Clocks and General Relativity
Hisaaki Shinkai, Masao Takamoto, Hidetoshi Katori
Optical lattice clocks (OLCs) enable us to measure time and frequency with a fractional uncertainty at level, which is 2 orders of magnitude better than Cs clocks. In th…
International comparison of optical frequencies with transportable optical lattice clocks
International Clock, Oscillator Networking, Collaboration +37
Optical clocks have improved their frequency stability and estimated accuracy by more than two orders of magnitude over the best caesium microwave clocks that realise the SI second…
Operational Magic Intensity for Sr Optical Lattice Clocks
Ichiro Ushijima, Masao Takamoto, Hidetoshi Katori
We experimentally investigate the lattice-induced light shift by the electric-quadrupole () and magnetic-dipole () polarizabilities and the hyperpolarizability in Sr optica…
Real-time geopotentiometry with synchronously linked optical lattice clocks
Tetsushi Takano, Masao Takamoto, Ichiro Ushijima +7
According to the Einstein's theory of relativity, the passage of time changes in a gravitational field. On earth, raising a clock by one centimetre increases its tick rate by 1.1 p…
Frequency ratio of Yb and Sr clocks with uncertainty at 150 s averaging time
Nils Nemitz, Takuya Ohkubo, Masao Takamoto +4
Transition frequencies of atoms and ions are among the most accurately accessible quantities in nature, playing important roles in pushing the frontiers of science by testing funda…
Frequency ratios of Sr, Yb and Hg based optical lattice clocks and their applications
Masao Takamoto, Ichiro Ushijima, Manoj Das +8
This article describes the recent progress of optical lattice clocks with neutral strontium (Sr), ytterbium (Yb) and mercury (Hg) atoms. In particular, we pr…