Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Masao Takamoto"'
Autor:
Tomoya Akatsuka, Hiromitsu Imai, Masao Takamoto, Ichiro Ushijima, Takashi Goh, Toshikazu Hashimoto, Hidetoshi Katori, Katsuya Oguri, Tetsuomi Sogawa
Publikováno v:
Optical Fiber Communication Conference (OFC) 2023.
We demonstrate a 190-km-long optical fiber link that achieves high-stability frequency transfer in noisy environments. A four-stage cascaded link with ultralow-noise laser repeater stations connects distant optical lattice clocks without deterioratin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::063b481e58c217a1d42b9626c88dd8a4
https://doi.org/10.1364/ofc.2023.m3j.2
https://doi.org/10.1364/ofc.2023.m3j.2
Autor:
Ryoto Takeuchi, Hayaki Chiba, Shoichi Okaba, Masao Takamoto, Shigenori Tsuji, Hidetoshi Katori
Publikováno v:
Applied Physics Express. 16:042003
We have demonstrated the continuous outcoupling of ultracold 88Sr atoms using a moving optical lattice. While Sr atoms are Zeeman-slowed and magneto-optically trapped on the 1S0–1P1 transition, the atoms relaxed to the 5s5p 3P2 metastable state are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf0153b5709cde38461bd81998bdd86b
https://doi.org/10.35848/1882-0786/accb3c
https://doi.org/10.35848/1882-0786/accb3c
Autor:
Kensuke Kokado, Ichiro Ushijima, Hisa-aki Shinkai, Toshihiro Yahagi, Hidetoshi Katori, Noriaki Ohmae, Masao Takamoto
Publikováno v:
Nature Photonics. 14:411-415
A clock at a higher altitude ticks faster than one at a lower altitude, in accordance with Einstein’s theory of general relativity. The outstanding stability and accuracy of optical clocks, at 10−18 levels1–5, allows height differences6 of a ce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e015efb6cca01d80cdffdf58cc995a06
https://doi.org/10.1038/s41566-020-0619-8
https://doi.org/10.1038/s41566-020-0619-8
Autor:
Masao Takamoto, Tomoya Akatsuka, Hidetoshi Katori, Tadahiro Takahashi, Noriaki Ohmae, Koji Hashiguchi
Publikováno v:
Physical Review A. 103
We report three-stage laser cooling of Sr atoms using the $5{s}^{2}\phantom{\rule{0.16em}{0ex}}^{1}S_{0}$ ground state and the $5s5p\phantom{\rule{0.16em}{0ex}}^{3}P_{2}$ metastable state. $^{87}\mathrm{Sr}$ atoms are precooled in a magneto-optical t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0af2c56382e00d48d8573231c13668c
https://doi.org/10.1103/physreva.103.023331
https://doi.org/10.1103/physreva.103.023331
Autor:
Katsuya Oguri, Hidetoshi Katori, Atsushi Ishizawa, Hiromitsu Imai, Hideki Gotoh, Takashi Goh, Toshikazu Hashimoto, T. Akatsuka, Noriaki Ohmae, Tetsuomi Sogawa, Ichiro Ushijima, Masao Takamoto
Publikováno v:
Optics express. 28(7)
We report a cascaded optical fiber link which connects laboratories in RIKEN, the University of Tokyo, and NTT within a 100-km region using a transfer light at 1397 nm, a subharmonic of the Sr clock frequency. The multiple cascaded link employing sev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b5b1bc8b1489c30820e480bda1291b7
https://pubmed.ncbi.nlm.nih.gov/32225530
https://pubmed.ncbi.nlm.nih.gov/32225530
Publikováno v:
OSA Quantum 2.0 Conference.
We developed a pair of transportable optical lattice clocks and conducted an 18-digit-precision frequency comparison in a broadcasting tower to give a height difference of 450 m, which tested the gravitational redshift at 10-5 level.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b379175074bb40a93f2e746f733e84ff
https://doi.org/10.1364/quantum.2020.qw4a.2
https://doi.org/10.1364/quantum.2020.qw4a.2
Autor:
Hidetoshi Katori, Toshihiro Shiimado, Kazuaki Fujii, Naoji Moriya, Kuniya Araki, Tetsuo Furumiya, Yuya Sakai, Takashi Muramatsu, Motohide Kokubun, Yosuke Takahashi, Ichiro Ushijima, Andrew Hinton, Masao Takamoto, Noriaki Ohmae, Naohiro Kamiya, Ryuya Muramatsu
Publikováno v:
Advanced Quantum Technologies. 4:2170081
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4bbff597f7fbb12b5d83b5d70201bbe
https://doi.org/10.1002/qute.202170081
https://doi.org/10.1002/qute.202170081
Publikováno v:
Physical Review A. 100
We report a frequency measurement on the $5s5p\phantom{\rule{0.16em}{0ex}}^{3}P_{2}\ensuremath{-}5s4d\phantom{\rule{0.16em}{0ex}}^{3}D_{3}$ transition of $^{88}\mathrm{Sr}$ atoms at $2.9\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{m}$. The exc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::467c2dd6b7a6774b2917f4ec469f95cf
https://doi.org/10.1103/physreva.100.042513
https://doi.org/10.1103/physreva.100.042513
Autor:
Naoji Moriya, Kazuaki Fujii, N. Ohmae, Naohiro Kamiya, Andrew Hinton, Masao Takamoto, Yuya Sakai, Ichiro Ushijima, Hidetoshi Katori, Kuniya Araki, Ryuya Muramatsu, Motohide Kokubun, Toshihiro Shiimado, Tetsuo Furumiya, Takashi Muramatsu, Yosuke Takahashi
Publikováno v:
Advanced Quantum Technologies. 4:2100015
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b3b9031acdd4c8e751768c0d20a1aa7
https://doi.org/10.1002/qute.202100015
https://doi.org/10.1002/qute.202100015
Autor:
Masao Takamoto, Hiroshi Munekane, Ichiro Ushijima, Yuki Kuroishi, Tetsushi Takano, Atsushi Yamaguchi, Noriaki Ohmae, Basara Miyahara, Tomoya Akatsuka, Hidetoshi Katori
Publikováno v:
Nature Photonics. 10:662-666
Real-time geopotential measurements with two synchronously linked optical lattice clocks are demonstrated. A height difference between the two clocks separated by 15 km is determined, with an uncertainty of 5 cm, by means of a gravitational redshift.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a96fd1db73854b49ab8bf0de7d16504
https://doi.org/10.1038/nphoton.2016.159
https://doi.org/10.1038/nphoton.2016.159