November 7, 2022

To whom it may concern,
Company: Tamagawa Holdings, Co., Ltd.
Representative: President, Toru Masuzawa(Tokyo Exchange Standard Code: 6838)
Contact: Management Planning Division, Kana Yamauchi
Tel: 03-6435-6933

Notice on the Successful Verification of Microcells for Quantum Sensors
at The University of Tokyo-Contribution to the Research of the Dark Matters in the SpaceWe are pleased to inform that we have succeeded in the verification of the alkali atomic microcells forquantum sensors (our produce) at The University of Tokyo, and such results shall be made in thepresentation at the domestic academic conference (The 39th “Sensor Micromachine and ApplicationSystem” Sympodium).
1. Objectives and overview of the verification test
As we can see in that fact that the Nobel Prize 2022 Physics winner was the researcher of “quantumentanglement,” further technology innovation has lately been expected in the quantum field which is thebase of optical devices including communication and laser, and our company will greatly contribute to thisquantum field (see Figure 1. Items where quantum sensor, optical quantum communication are applied).
Quantum sensors are expected to be the next-generation ultra-highly sensitive sensors and said to beable to detect dark matters in the space. We have now succeeded in obtaining a good result byconducting Cs absorption saturation spectroscopic test using microcells (see Figure 2. Microcells
produced by us) mainly with Professor Takanori Aoki and others in the Torii lab at The University of Tokyo
Graduate School aiming search for such dark matters.

Quantum cryptographic
communication for satellites

Detection of dark matters

Quantum sensors/ opticalquantum communication
Ultra-high performance inertial
sensors to be mounted on nextgeneration automobiles

High-performance medical
equipment/magnetoencephalography

Figure 1. Items where quantum sensor, optical quantum communication areapplied
Widely applied including detection of dark matters in the space, quantum
cryptographic communication in satellites, inertial sensors to be mounted on ultrahigh performance next-generation automobiles, magnetic sensor such as
magnetoencephalography for medical treatment.

As microcells are smaller in size, consume less power and allow us to greatly reduce the measurement
time compared with the conventional cells, there are a lot of demands for them besides the use forminiature atomic clock. It has been determined that such result will be presented at the 39th “Sensor
Micromachine and Application System” Sympodium, one of the largest academic conferences in Japan
regarding the field of MEMS, Micro Electromechanical Systems applying the semiconductor technology.
Information on the presentation shall be provided in the next page.
2. Information on the presentation
Conference title:
The 39th “Sensor Micromachine and Application System”
Sympodium
Date: November 14, 2022 (Mon) – November 17, 2022 (Thu)
Venue: Asty Tokushima (Tokushima Pref.)Date and time: November 16, 2022 (Wed) 12:50-14:20
Title: Cs Atomic Microcell Spectroscopy for Quantum Sensors
Presentation No.: L-280
Conference URL：https://sensorsymposium.org/

Figure 2. Microcell for the quantum
sensor produced this time

3. BackgroundAs announced in “Commencement of Research on
Application Using a Small Atomic Clock and Atomic Clock” dated July 6, 2020, with Professor Takahito
Ono of the Graduate School of Tohoku University as the representative for the research, we haveproceeded with the joint research of the application using a small atomic clock and atomic clock.
As announced in the “Notice on Success of Production of Sales of Gas Cells of New Miniature Atomic
Clocks -Emergence into the New Market from Ultra-high Precision Magnetic Sensor to Gyroscope
Sensor-“ dated September 10, 2021, we succeeded in development of a gas cell (microcell) used forminiature atomic clocks and proceeded with hearing on the specifications, etc. focusing on sales of
microcells only and with the further research and development for achievement of verification for quantum
sensors as informed in this notice.
As needs of the time and society drastically change, we are aiming for business expansion byexpanding the existing domains to new domains by finding new challenges and needs. We will continue
to contribute to achievement of “decarbonated society” by providing solutions in “communication,”“energy” and “space” fields.