astronomy

Hidetoshi Katori

Hidetoshi Katori is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hidetoshi Katori rather than just read about it. In short: Hidetoshi Katori (香取秀俊, Katori Hidetoshi; born 27 September 1964) is a Japanese physicist and professor at the University of Tokyo best known for having invented the magic wavelength technique for ultra precise optical lattice atomic clocks. Since 2011, Katori is also Chief Scientist at the Quantum Metrology Lab, RIKEN.

Key takeaways

Hidetoshi Katori belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hidetoshi Katori to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hidetoshi Katori from memory before moving on to harder problems.

Reference excerpt

Hidetoshi Katori (香取秀俊, Katori Hidetoshi; born 27 September 1964) is a Japanese physicist and professor at the University of Tokyo best known for having invented the magic wavelength technique for ultra precise optical lattice atomic clocks. Since 2011, Katori is also Chief Scientist at the Quantum Metrology Lab, RIKEN. Recently, Katori's group performed a measurement of gravitational redshift with two transportable strontium optical lattice clocks over nearly the entire height of the Tokyo Skytree, setting a new record for the best ground-based test of general relativity.

Recognition 2005 – Award of Japan Society for the Promotion of Science 2005 – Springer Nature Applied Physics Award 2006 – Japan IBM Science Prize 2008 – I. I. Rabi Award 2010 – Ichimura Academic Award 2011 – Award of Minister of MEXT 2011 – Philipp Franz von Siebold-Preis, Germany 2012 – Asahi Prize 2013 – Nishina Memorial Prize 2013 – Fujiwara Prize 2013 – Toray Award in Science and Technology 2014 – Medal with Purple Ribbon 2015 – Japan Academy Prize (academics) 2017 – Leo Esaki Prize 2022 – Breakthrough Prize in Fundamental Physics 2022 – Honda Prize 2022 – Asian Scientist 100, Asian Scientist

Selected publications Ushijima, Ichiro; Takamoto, Masao; Das, Manoj; Ohkubo, Takuya; Katori, Hidetoshi (9 February 2015). "Cryogenic optical lattice clocks". Nature Photonics. 9 (3). Springer Science and Business Media LLC: 185–189. Bibcode:2015NaPho...9..185U. doi:10.1038/nphoton.2015.5. ISSN 1749-4885. Yamaguchi, Atsushi; Fujieda, Miho; Kumagai, Motohiro; Hachisu, Hidekazu; Nagano, Shigeo; Li, Ying; Ido, Tetsuya; Takano, Tetsushi; Takamoto, Masao; Katori, Hidetoshi (4 August 2011). "Direct Comparison of Distant Optical Lattice Clocks at the $10^{-16}$ Uncertainty". Applied Physics Express. 4 (8) 082203. IOP Publishing. arXiv:1108.2774. doi:10.1143/apex.4.082203. ISSN 1882-0778. S2CID 118692461. Katori, Hidetoshi; Hashiguchi, Koji; Il'inova, E. Yu.; Ovsiannikov, V. D. (9 October 2009). "Magic Wavelength to Make Optical Lattice Clocks Insensitive to Atomic Motion". Physical Review Letters. 103 (15) 153004. American Physical Society (APS). Bibcode:2009PhRvL.103o3004K. doi:10.1103/physrevlett.103.153004. ISSN 0031-9007. PMID 19905634. Takamoto, Masao; Hong, Feng-Lei; Higashi, Ryoichi; Fujii, Yasuhisa; Imae, Michito; Katori, Hidetoshi (15 October 2006). "Improved Frequency Measurement of a One-Dimensional Optical Lattice Clock with a Spin-Polarized Fermionic87Sr Isotope". Journal of the Physical Society of Japan. 75 (10) 104302. Japan Society of Applied Physics. arXiv:physics/0608212. Bibcode:2006JPSJ...75j4302T. doi:10.1143/jpsj.75.104302. ISSN 0031-9015. S2CID 17685448. Takamoto, Masao; Hong, Feng-Lei; Higashi, Ryoichi; Katori, Hidetoshi (2005). "An optical lattice clock". Nature. 435 (7040). Springer Science and Business Media LLC: 321–324. Bibcode:2005Natur.435..321T. doi:10.1038/nature03541. ISSN 0028-0836. PMID 15902252. S2CID 4426565. KATORI, HIDETOSHI (2002). "SPECTROSCOPY OF STRONTIUM ATOMS IN THE LAMB-DICKE CONFINEMENT". Frequency Standards and Metrology. WORLD SCIENTIFIC. pp. 323–330. doi:10.1142/9789812777713_0036. ISBN 978-981-02-4911-3. Katori, Hidetoshi; Ido, Tetsuya; Kuwata-Gonokami, Makoto (15 August 1999). "Optimal Design of Dipole Potentials for Efficient Loading of Sr Atoms". Journal of the Physical Society of Japan. 68 (8). Physical Society of Japan: 2479–2482. Bibcode:1999JPSJ...68.2479K. doi:10.1143/jpsj.68.2479. ISSN 0031-9015. Katori, Hidetoshi; Ido, Tetsuya; Isoya, Yoshitomo; Kuwata-Gonokami, Makoto (8 February 1999). "Magneto-Optical Trapping and Cooling of Strontium Atoms down to the Photon Recoil Temperature". Physical Review Letters. 82 (6). American Physical Society (APS): 1116–1119. Bibcode:1999PhRvL..82.1116K. doi:10.1103/physrevlett.82.1116. ISSN 0031-9007.

References

External links "Homepage". University of Tokyo. Retrieved 24 November 2018. "Publishing House". Scopus. Retrieved 24 November 2018.

Illustrations

Worked examples

Example 1 — a first encounter with Hidetoshi Katori

Start with the simplest possible case. Write down what Hidetoshi Katori claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hidetoshi Katori before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hidetoshi Katori ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hidetoshi Katori

In research: Hidetoshi Katori appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hidetoshi Katori in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hidetoshi Katori is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1964 births, Academic staff of the University of Tokyo, Japanese physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Hidetoshi Katori outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hidetoshi Katori in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hidetoshi Katori means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hidetoshi Katori out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hidetoshi Katori in simple terms?

Why does Hidetoshi Katori matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hidetoshi Katori?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hidetoshi Katori.