## Selected invited talks

##### 2019

Hidetoshi Katori, (Keynote) Transportable Optical Lattice Clocks to Test Gravitational Redshift, EU-USA-Japan International Symposium on Quantum Technology (ISQT) (2019/12/16-17).

Hidetoshi Katori, Transportable Optical Lattice Clocks to Test Gravitational Redshift, ENS/UTokyo WS on Physics (2019/11/25-26).

Hidetoshi Katori, Optical lattice clocks “From curiosity-driven research to practical devices,” QUANTUM TECHNOLOGY SEMINAR ~How collaboration of Japanese and Danish researchers is contributing to current and future innovation ~ (2019/11/21).

Hidetoshi Katori, Optical lattice clocks and their field operation, Physics of fundamental Symmetries and Interactions - PSI2019 (2019/10/20-25).

Hidetoshi Katori, Optical lattice clocks---From curiosity-driven research to practical devices---, UK-Japan Quantum Sensing and Metrology Workshop (2019/9/10-11).

Hidetoshi Katori, (Plenary talk) Optical lattice clocks and their applications---From curiosity-driven research (1999) to practical devices---, XXXI International Conference on Photonic, Electronic and Atomic Collisions (XXXI ICPEAC) (2019/7/24-30).

Hidetoshi Katori, (Keynote) Magic conditions for optical lattice clocks to operate at 10^{-19} uncertainty, CLEO/EUROPE-EQEC (2019/6/23-27).

Current Status of Optical Lattice Clocks at RIKEN & UT, 2019 Joint Conference of the IEEE International Frequency Control, Symposium and European Frequency and Time Forum (EFTF/IFC) (2019/4/14-18).

Hidetoshi Katori, Magic conditions for optical lattice clocks to operate at 10^{-19} uncertainty,
The 11th International Workshop on Fundamental Physics Using Atoms (2019/3/3).

Hidetoshi Katori, Magic conditions for optical lattice clocks to operate at 10^{-19} uncertainty, Kavli IPMU Visions for table-top dark matter experiments (2019/2/26).

##### 2018

Hidetoshi Katori, Magic conditions for optical lattice clocks to operate at 10^{-19} uncertainty, US-Japan QELS-13, the 13th Japan-US Joint Seminar on Quantum Electronics and Laser Spectroscopy (2018/9/26).

Hidetoshi Katori, Connecting optical lattice clocks at 10^{-18} uncertainty, the 670th Wilhelm and Else Heraeus-Seminar “Fundamental Constants: Basic Physics and Units,” Physikzentrum Bad Honnef (2018/5/15).

Hidetoshi Katori, Optical Lattice Clocks: Seeking for a Future Second, DENMARK AND JAPAN STI SEMINAR QUANTUM TECHNOLOGY CREATING THE FUTURE (2018/4/12).

Hidetoshi Katori, (Plenary) Optical Lattice Clocks: Reading the 18th Decimal Places of Frequency, SPIE PHOTONIC WEST LASE 2018 (2018/1/31).

##### 2017

Hidetoshi Katori, Optical Lattice Clocks: Seeking for a Future Second, JAPAN-DENMARK 150TH Anniversary Year of Diplomatic Relationship, Photonics Creating the Future (2017/11/16).

Hidetoshi Katori, Connecting optical lattice clocks at 10^{-18} uncertainty, The 24th Congress of the International Commission for Optics, ICO-24 (2017/8/23).

Hidetoshi Katori, Optical lattice clocks and their applications, International Conference on Laser Spectroscopy, ICOLS 2017 (2017/7/4).

Hidetoshi Katori, (Keynote Address) Reading 18th decimal places of time with optical lattice clocks: miniaturization and new application, MEMS Engineer Forum, MEF (2017/4/27).

Hidetoshi Katori, Connecting optical lattice clocks at 10^{-18} uncertainly, geo-Q General Assembly (2017/2/23).

Hidetoshi Katori, Optical Lattice Clocks: Reading the 18th decimal place of frequency, 55th International Winter Meeting on Nuclear Physics (2017/1/26).

##### 2016

Hidetoshi Katori, (Plenary) Optical Lattice Clocks:Seeking for a New Second, International Symposium on Optomechatronic Technology (ISOT 2016 Itabashi Tokyo) (2016/11/7).

Hidetoshi Katori, Frequency ratios of optical lattice clocks at the 17th decimal place, Varying Constants and Fundamental Cosmology, VARCOSMOFUN’16 (2016/9/13).

Hidetoshi Katori, Frequency ratios of optical lattice clocks at the 17th decimal place, The 25th International Conference on Atomic Phyics ICAP 2016 (2016/7/25).

Hidetoshi Katori, Frequency ratios of optical lattice clocks at the 17th decimal place, 47th Annual Meeting of the APS Divison of Atomic, Molecular and Optical Physics (2016/5/26).

##### 2015

Hidetoshi Katori, Frequency Comparisons of Sr, Yb and Hg based optical lattice clocks in the lab and between the labs, 8th Symposium on Frequency Standards and Metrology 2015 (2015/10/13).

Hidetoshi Katori, Frequency ratios of optical lattice clocks at the 17thdecimal place, 12th US-Japan Seminar on many body quantum systems (2015/9/22).

Hidetoshi Katori, Seeking for a New Second, iNOW2015, International Nano Optoelectronics Workshop (2015/8/3).

Hidetoshi Katori, Lattice Clocks-from the beginning to the latest-, OCS2015, School on Optical Clocks (2015/7/3).

Hidetoshi Katori, Frequency ratios of Sr, Yb, and Hg based optical lattice clocks and their applications, ICOLS2015, 22nd International Conference on Laser Spectroscopy (2015/6/30).

Hidetoshi Katori, Frequency Comparison of Optical Lattice Clocks and its Applications, Gordon Research Conference on Atomic Physics: From Ultracold to Strongly Interacting Quantum Systems (2015/6/18).

Hidetoshi Katori, Frequency comparisons of Sr, Yb, and Hg based optical lattice clocks and their applications, CLEO 2015 (2015/5/15).

##### 2014

Hidetoshi Katori, (Plenary) Optical Lattice Clocks as Quantum Sensors for Space-time and Fundamental Physics, 11th Asian International Seminar on Atomic and Molecular Physics (AISAMP11) (2014/10/10).

Hidetoshi Katori, Reading 18th Decimal Places of Time with Optical Lattice Clocks, 2014URSI (URSI-JRSM2014) (2014/9/8).

Hidetoshi Katori, Optical lattice clocks-sensing the space-time curvature, Physics Colloquium, Universität Tübingen (2014/7/16).

Hidetoshi Katori, Frequency comparison of cryogenic optical lattice clocks, New Ideas in low-Energy Tests of Fundamental Physics (2014/6/16).

Hidetoshi Katori, Frequency comparison of cryogenic Sr optical lattice clocks at 10^{-18}, 7th International Workshop on Fundamental Physics using Atoms 2014 (FPUA2014) (2014/3/16) .

##### 2013

Masao Takamoto, Ichiro Ushijima, Takuya Ohkubo, Manoj Das, Nils Nemitz, and Hidetoshi Katori, Optical lattice clocks with 87Sr in a cryogenic environment, Modern Problems of Laser Physics (MPLP 2013) (2013/8/25).

Hidetoshi Katori, Precise Comparisons of Optical Lattice Clocks, CLEO-PR&OECC/PS 2013 Workshop on C-Special : Photon Frontier Network (2013/6/30).

Hidetoshi Katori, Development of Optical Lattice Clocks Aiming at 10^{-18} Uncertainties, Quantum Optics Ⅷ (2013/5/30).

Hidetoshi Katori, Precise Frequency Comparisons of Optical Lattice Clocks, C3QS:Coherent Control of Complex Quantum Systems (2013/5/8).

Hidetoshi Katori, Optical lattice clocks:A decade after Yatsugatake US-Japan seminar, US-JAPAN Joint seminar 2013 (2013/4/9).

Hidetoshi Katori, Optical Lattice clocks at Riken, NICT Workshop on the optical frequency standards -Recent progress and future prospect- (2013/2/7).

Hidetoshi Katori, Optical Lattice Clocks at Riken- efforts for developing accurate (10^{-18}) and stable clocks with long term operation for future applications-, The 72nd Okazaki Conference on "Ultimate Control of Coherence" (2013/1/8).

##### 2012

Hidetoshi Katori, Clocks as a tool for exploring the spacetime curvature, ASI Science Dojo (2012/11/29).

Hidetoshi Katori, Optical lattice clocks at Riken, The 5th International workshop on ultracold group Ⅱatoms (2012/10/10).

Hidetoshi Katori, Optical Lattice clocks and their applications, 6th Asian Summer School and Symposium on Laser-Plasma Acceleration and Radiation (2012/9/4).

Hidetoshi Katori, Prospects for Frequency Comparison of Sr and Hg Based Optical Lattice Clocks Toward 10^{-18} Uncertainties, 2012 IEEE International Frequency Control Symposium (2012/5/22).

Hidetoshi Katori, Synchronous frequency comparison of optical lattice clocks to approach the quantum limit, Shanghai-Tokyo Advanced Research symposium on Ultrafast Intense Laser Science (2012/5/17).

Hidetoshi Katori, Prospects for Frequency Comparison of Optical Lattice Clocks Toward 10^{-18} Fractional Uncertainties, 2012 European Frequency and Time Forum (2012/4/22).

##### 2011

Hidetoshi Katori, 光格子時計/Optical lattice clocks and future roles for clocks”, Germany-Japan Round Table From the early universe to the evolution of life (2011/12/3).

Masao Takamoto, Frequency comparison of optical lattice clocks near the quantum limit, Cold Antimatter & High Precision Physics (pbar11) (2011/11/29).

Masao Takamoto, Tetsushi Takano, and Hidetoshi Katori, Frequency Comparison of Optical Lattice Clocks, SPIE (2011/9/12).

Hidetoshi Katori, Tetsushi Takano, and Masao Takamoto, Synchronous frequency comparison of optical lattice clocks to approach the quantum limit, URSI General Assembly and Scientific Symposium(URSIGASS2011) (2011/8/19).

Hidetoshi Katori, Tetsushi Takano, and Masao Takamoto, Synchronous Frequency Comparison of Optical Lattice Clocks to approach the Quantum Limit, 487. Wilhelm and Else Heraeus Seminar Astrophysics, Clocks and Fundamental Constants (2011/7/20).

Hidetoshi Katori, Synchronous Frequency Comparison of Optical Lattice Clocks to approach the Quantum Limit, The 20th International Conference on Laser Spectroscopy (ICOLS 2011) (2011/5/30).

Hidetoshi Katori, Frequency Comparison of Optical Lattice Clocks near the Quantum Limit, ERATO Macroscopic Quantum Control Conference on ltracold Atoms and Molecules (UCAM2011) (2011/1/25).

##### ～2010

Masao Takamoto, Tetsushi Takano, and Hidetoshi Katori, Frequency comparison of optical lattice clocks, INRIM (2010/12/1).

Hidetoshi Katori, 17-digits' Frequency Comparison of "Optical Lattice Clocks" at the Standard Quantum Limit, QIT23 (2010/11/6).

Hidetoshi Katori, 17-digits’ Frequency Comparison of Optical Lattice Clocks near the Quantum Limit, The third international conference on “Updating Quantum Cryptography and Communications” (2010/10/20).

Hidekazu Hachisu, Masao Takamoto, and Hidetoshi Katori, Measurement of the Blackbody shift using a cryogenic Sr Optical lattice clock, 2010 Asia-Pacific Radio Science Conference (AP-RASC'10), A3b-5 (2010/9/24).

Masao Takamoto, Tetsushi Takano, and Hidetoshi Katori, Opitcal lattice clock, International Conference on Coherent and Nonlinear Optics (ICONO 2010)IWA3 (2010/8/25).

Hidetoshi Katori, Optical Lattice Clocks & Frequency Comparisons, 22nd International conference on Atomic Physics (2010/7/27).Tetsushi Takano, Hidekazu Hachisu, Masao Takamoto, and Hidetoshi Katori,

Optical lattice clock, Variation of fundamental constants and violation of fundamental symmetries P, T(EDM), CPT, Lorentz invariance (2010/7/24)

Hidetoshi Katori, Optical Lattice Clocks & Frequency Comparisons, 2010 Conference on Precision Electromagnetic Measurements (CPEM) (2010/6/15).

Hidetoshi Katori, Optical Lattice Clocks toward 10^{-17} Uncertainty, CLEO/QELS: 2010 Laser Science to Photonic Applications (2010/5/17).

Hidetoshi Katori, Five years’ progress in optical lattice clocks, 2010 International Symposium on Physics of Quantum Technology (2010/4/9).