Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Hisai, Yusuke"'
Autor:
Kobayashi, Takumi, Akamatsu, Daisuke, Hosaka, Kazumoto, Hisai, Yusuke, Nishiyama, Akiko, Kawasaki, Akio, Wada, Masato, Inaba, Hajime, Tanabe, Takehiko, Hong, Feng-Lei, Yasuda, Masami
We report on a reduced time variation of a time scale with respect to Coordinated Universal Time (UTC) by steering a hydrogen-maser-based time scale with a near-continuously operating optical lattice clock. The time scale is generated in a post-proce
Externí odkaz:
http://arxiv.org/abs/2404.11062
Autor:
Kobayashi, Takumi, Takamizawa, Akifumi, Akamatsu, Daisuke, Kawasaki, Akio, Nishiyama, Akiko, Hosaka, Kazumoto, Hisai, Yusuke, Wada, Masato, Inaba, Hajime, Tanabe, Takehiko, Yasuda, Masami
Publikováno v:
Phys. Rev. Lett. 129, 241301 (2022)
We search for ultralight scalar dark matter candidates that induce oscillations of the fine structure constant, the electron and quark masses, and the quantum chromodynamics energy scale with frequency comparison data between an $^{171}$Yb optical la
Externí odkaz:
http://arxiv.org/abs/2212.05721
Autor:
Kobayashi, Takumi, Akamatsu, Daisuke, Hosaka, Kazumoto, Hisai, Yusuke, Wada, Masato, Inaba, Hajime, Suzuyama, Tomonari, Hong, Feng-Lei, Yasuda, Masami
Publikováno v:
Metrologia, Vol. 57, No. 6, pp.065021 (2020)
Optical lattice clocks surpass primary Cs microwave clocks in frequency stability and accuracy, and are promising candidates for a redefinition of the second in the International System of Units (SI). However, the robustness of optical lattice clocks
Externí odkaz:
http://arxiv.org/abs/2011.07484
Autor:
Hisai, Yusuke, Akamatsu, Daisuke, Kobayashi, Takumi, Hosaka, Kazumoto, Inaba, Hajime, Hong, Feng-Lei, Yasuda, Masami
We report improved frequency ratio measurement with $^{87}$Sr and $^{171}$Yb optical lattice clocks at the National Metrology Institute of Japan (NMIJ). The $^{87}$Sr optical lattice clock is enhanced with several major modifications and is re-evalua
Externí odkaz:
http://arxiv.org/abs/2010.09976
Autor:
Kobayashi, Takumi, Akamatsu, Daisuke, Hisai, Yusuke, Tanabe, Takehiko, Inaba, Hajime, Suzuyama, Tomonari, Hong, Feng-Lei, Hosaka, Kazumoto, Yasuda, Masami
Publikováno v:
IEEE Transactions on Ultrasonics Ferroelectrics, and Frequency Control, Vol. 65, No. 12, pp.2449 (2018)
We report an uncertainty evaluation of an $^{171}$Yb optical lattice clock with a total fractional uncertainty of $3.6\times10^{-16}$, which is mainly limited by the lattice-induced light shift and the blackbody radiation shift. Our evaluation of the
Externí odkaz:
http://arxiv.org/abs/1901.00954
Autor:
Ikeda, Kohei, Hisai, Yusuke, Yoshii, Kazumichi, Kosaka, Hideo, Hong, Feng-Lei, Horikiri, Tomoyuki
We demonstrate a compact frequency-stabilized laser at 1064 nm using Doppler-free saturation absorption spectroscopy of molecular iodine. The achieved laser frequency stability and linewidth are 5.7 10-12 (corresponding to an uncertainty of the laser
Externí odkaz:
http://arxiv.org/abs/1807.03472
Autor:
Akamatsu, Daisuke, Kobayashi, Takumi, Hisai, Yusuke, Tanabe, Takehiko, Hosaka, Kazumoto, Yasuda, Masami, Hong, Feng-Lei
Publikováno v:
IEEE Transactions on Ultrasonics Ferroelectrics, and Frequency Control, Vol. 65, No. 6, pp.1069 (2018)
We have developed an optical lattice clock that can operate in dual modes: a strontium (Sr) clock mode and an ytterbium (Yb) clock mode. Dual-mode operation of the Sr-Yb optical lattice clock is achieved by alternately cooling and trapping $^{87}$Sr
Externí odkaz:
http://arxiv.org/abs/1806.02260
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