Michito Imae

TL;DR: The results demonstrate the excellent functions of the intercity optical fiber link and the great potential of optical lattice clocks for use in the redefinition of the second.

TL;DR: In this paper, a spin-polarized fermionic isotope was designed to realize a collision-shift-free atomic clock with neutral atom ensembles, and the absolute frequency of the clock transition was determined as 429,228,004,229,875(4) Hz, where the uncertainty was mainly limited by the frequency link.

TL;DR: In this paper, a one-dimensional optical lattice clock with a spin-polarized fermionic isotope was proposed to realize a collision-shift-free atomic clock with neutral atom ensembles.

TL;DR: In this paper, the authors compared the accuracy of the ionospheric TEC map produced from GPS measurements, two cases of TEC maps were compared with dual band VLBI TEC measurements, and the error spectrum of GIM/CODE data was computed.

TL;DR: A new type of bidirectional optical amplifier that overcomes the fiber loss limits that have prevented accurate frequency comparisons between widely separated places is described; such comparison is realized by bidirectionally transmitting wavelength-division-multiplexed (WDM) signals along a single fiber.