My Travels in

Spring and Summer 2019

Yuta MichimuraDepartment of Physics, University of Tokyo

August 8, 2019Ando Lab Seminar

My Travels• March 18-26: QFilter Workshop @ Paris

• May 20-21: Kamioka

• June 18: ICRR Seminar @ Kashiwa

• June 19-25: KIW6 @ Wuhan

• June 30: FF meeting @ Nagoya

• July 1: KAGRA Extended Chief Meeting @ U Toyama

• July 2-3: Kamioka

• July 5-6: Darkon 2019 @ Waseda

• July 8-14: GR22 and Amaldi13 @ Valencia

• July 23-27: TianQin Summer School @ Zhuhai

• July 29: KAGRA Extended Chief Meeting @ U Toyama

• July 30-31: Kamioka

• August 5: Yorita Lab Seminar @ Waseda 2

TianQin Summer

School 2019

TianQin Summer School 2019• 中山大学天琴中心2019年引力波暑期学校

http://tianqin.sysu.edu.cn/zh-hans/content/421

• Two weeks, 10 lecturers (~4 slots each)

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马怡秋 Yiqiu MaThis building is under construction (~Fall 2019)

TianQin Research Center• Direct flight from 羽田 to 広州 (Guangzhou)

• Two hours drive to 珠海 (Zhuhai)

• Very nice city with mountains and beaches

• 中山大学 campus itself is also very nice

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6

Lectures• I gave lectures on interferometry and quantum noise

calculations (and beauty of Fabry-Perot)

• Yiqiu gave another lectures on quantum noise calculations

from Hamiltonian afterwards

• Some students are very active

and asked me many questions

7World’s second longest lecture building

天琴计划激光測距台站 Visit• Lunar laser ranging facility

• Facility was very nice and new

• Already produced some results

8

By Hsien-Chi Yeh

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结业式

GR22 and Amaldi13

GR22 and Amaldi13• 22nd International Conference on General Relativity and

Gravitation

• 13th Edoardo Amaldi Conference on Gravitational Waves

https://www.gr22amaldi13.com/

• I gave KAGRA upgrade talk

• More than 1000 participants,

~10 parallel sessions

• I was mostly attending

- Experimental Gravitation

- Measurements of G

- LISA

sessions

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Some Interesting Talks• Experimental Studies Of Gravity With Slow Neutrons,

Kitaguchi, Masaaki- Neutron interferometer (can be also used for GW detection?)

• Newton-V Experiment: Test Of Gravitational Inverse Square

Law At A Micrometer Scale Shibaguchi, Hiroyuki- Started to use interferometers instead of cameras

• Experimental Search For New Gravity-Like Interactions In

The Nanometer Range, Kamiya, Yoshio- Using angular distribution of neutron scattering off Xe gas

• A New Class Of Experiments On The True Relativistic

Nature Of The One-Way Propagation Of Light

Unnikrishnan. C. S.

• Space+Ground Multiband Detections. How Many?,

Gerosa, D- 3-12 stellar mass BBHs / 4 years (LISA will limit the observation)12

Some Interesting Talks• Cosmic Explorer, Matt Evans

- CE1 (room temperature) and CE2 (Voyager type)

• Gravimetry on the milliscale - 100mg as a source mass,

Tobias Westphal- 100 mg-100 mg dumbbell torsion pendulum, 6 mHz resonance, 0.2

pN/rtHz below 0.1 mHz, 100 mg source mass, UV LED discharge, factor

of 5 to observe gravitational force (but repulsive)

• Update On The Work At Nist On The Determination Of

Newton’S Constant, G, Using The Bipm 2013 Apparatus,

Clive Speake- Use sapphire source mass to confirm BIPM 2013 result

• Space-Based Gravitational Wave Detector Simulation

Architecture For Noise Coupling Analysis And System

Optimization—Current Status And Future Development,

Zhang Y.Z.- Simulation development in China 13

Darkon 2019

Darkon 2019• ダークマターの懇談会 2019

• Slides available at

http://www.kylab.sci.waseda.ac.jp/darkon2019/

• More than 100 people attended

• Many talks on both theory and experiment

• I talked about DANCE and axion dark matter search with

interferometric gravitational wave detector

• Dark matter field looks chaotic and experiments look tough

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Dark Matter Ranking• Believe if theorists say it is

interesting, but don’t believe if

theorists say it is not interesting

16濱口幸一

郡和範

Axions and Gravitational Waves• Axions can be detected with gravitational wave detectors

17早田次郎

arXiv:1904.09143

KIW6

KIW6• The 6th KAGRA International Workshop

http://kiw6.csp.escience.cn/dct/page/1

• 中国科学院武汉物理与数学研究所

• Social event was very good

Cycling at East Lake

• Wuhan is famous for

breakfast

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Atom Interferometer at WIPM• Underground, 12 m tall

• Test of equivalence principle

• Also prototype for ZAIGA(Zhaoshan Long-baseline

Atom Interferometer

Gravitation Antenna)

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华中科技大学引力中心 Visit• Torsion pendulum and atom interferometer experiments in

underground facility

• Equivalence principle,

Square inverse law,

Gravitational constant,

Photon mass…

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SoundproofMagnetic shieldVibration isolated room

G Measurement at 12 ppm

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Rotary connector

Compensatelocal gravity field

Q. Li+, Nature 560, 582 (2018)

CODATA 2018• 6.67430(15) x 10-11 m3 kg-1 s-2

• 6.67408(31) x 10-11 m3 kg-1 s-2 (CODATA-2014)

23Q. Li+, Nature 560, 582 (2018)

QFilter Workshop

QFilter Project• Manipulation of an optomechanically coupled

oscillator using a quantum filter

• ANR-JST joint research

PI

Antoine Heidmann (Laboratoire Kastler Brossel)

- 0.54Million Euro

- January 2019 – December 2024

PI

Kentaro Somiya (Tokyo Institute of Technology)

- 180Million Yen (~1.4Million Euro)

- October 2018 – March 2024

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Objectives• Optomechanics for signal gain and bandwidth

enhancement

• Proof of principle experiments

- signal gain enhancement

- signal bandwidth enhancement

• Application of these techniques

- Test of quantum mechanics

- Gravitational wave detection

- Nuclear magnetic resonance (NMR) detection

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• LKB: Laboratoire Kastler Brossel

• LAL: Laboratoire de l'Accélérateur Linéaire

• LMA: Laboratoire des Matériaux Avancés

• TT: Tokyo Institute of Technology

• UT: University of Tokyo

• RCAST: Research Center for Advanced Science

and Technology, University of Tokyo

• Kyoto: Kyoto University

• Tohoku: Tohoku University

Institutes

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Nobuyuki Matsumoto

(Tohoku University)

Kazuyuki Takeda

(Kyoto University)

Yuta Michimura

(University of Tokyo)

Koji Usami

(RCAST)

Kentaro Somiya

(Tokyo Institute

of Technology)

Signal Gain Enhancement• At TT

• Modify optical spring frequency using a non-linear

crystal in signal recycling cavity

• Demonstration experiment on-going

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Optical spring frequency shifts

due to parametric amplificationOptical resonance

K. Somiya+, Phys. Lett. A 380, 5 (2016)

Signal Bandwidth Enhancement• At LKB

• Bandwidth can be enhanced by compensating the

phase delay using negative dispersion of a micro

resonator

• Micropillar (30 μg) can be used

30H. Miao+, PRL 115, 211104 (2015)

Test of Quantum Mechanics• At LKB, UT and Tohoku

• Test at various scales to look into classical-

quantum boundary

• Works for ground state cooling, standard quantum

limit measurement on-going

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30 μg micropillar

0.2-1 mg levitated mirror

7 mg suspended mirror10 mg torsion bar

Gravitational Wave Detection• At LKB, LAL, TT and UT

• Sensitivity enhancement of GW detectors

- parametric signal amplification

- bandwidth enhancement

- frequency dependent squeezing

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S S Y Chua+, CQG 31, 183001 (2014)

Nuclear Magnetic Resonance• At RCAST and Kyoto

• Readout NMR signal optomechanically to increase

the sensitivity

• Demonstration done, working on further sensitivity

enhancement

33K. Takeda+, Optica 5, 152 (2018)

QFilter Workshop• First occasion to meet collaborators face-to-face

• Plan to have the workshop annually between

France and Japan (next one is Kyoto in March 2020)

• March 19-20: Workshop & tour at LKB (Paris)

• March 21: Discussion & tour at LMA (Lyon)

• March 22: Lab tour to LAL (Orsay)

• March 25: Meet Matteo Barsuglia at APC (Paris)

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Workshop Participants

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• August 19-20: Kamioka

• August 21-24: KAGRA F2F @ U Toyama

• September 9-13: TAUP2019 @ Toyama- DANCE talk

• September 17-20: JPS meeting 2019 Fall @ Yamagata U- km-scale space GW detector talk

• October 9-10: Soda Lab Seminar @ Kobe U- GW and Lorentz invariance talk

• October 14-17: GWPAW2019 @ RESCEU- KAGRA upgrade poster

• October 21-24: 4M-COCOS @ Fukuoka U- KAGRA status talk

• November 8-10: 量子エレクトロニクス研究会@ 山中寮- GW detection and quantum technologies talk

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Upcoming Travel Plans