June 2023 Vol. 21 No. 662023

https://www.ntt-review.jp/archive/2023/202306.html

View from the Top
Keigo Kajimura, Senior Executive Vice President, NTT
Communications

Front-line Researchers
Yutaka Miyamoto, NTT Fellow, NTT Network Innovation
Laboratories

Rising Researchers
Yasutoshi Ida, Distinguished Researcher, NTT Computerand Data Science Laboratories

Feature Articles
Toward Quantum Technology Innovation
Expectations and Prospects for Innovation in Quantum Technology
Optical Technologies for Optical Quantum Computing with Continuous Variables
Quantum Information Technology Based on Superconducting Quantum Circuits
Optical-lattice-clock-network Technology for Gravitational Potential Sensing
Extracting Quantum Power by Using Algorithms and Their Verification
Improving the Performance of Quantum Key Distribution
Toward a Quantum Internet

Regular Articles
Identification of Transcription Factors and the Regulatory Genes Involved in Triacylglycerol
Accumulation in a Unicellular Red Alga

Global Standardization Activities
Recent Activities of QoE-related Standardization in ITU-T SG12

Practical Field Information about Telecommunication Technologies
Deterioration of Telecommunication Equipment and Facilities in Salt-damage Environments—
Case Studies of Corrosion in Guy Wires and Maintenance Holes

View from the TopKeigo Kajimura, Senior Executive Vice President,NTT Communications▼Abstract
In 2022, the new DOCOMO Group was formed after a reorganization of NTT
DOCOMO, NTT Communications, and NTT COMWARE. Since then, the Group has
integrated the three companies’ business functions and clarified their respectiveroles to improve the value it provides to customers and boost growth. Under its
brand slogan “Changing worlds with you,” the new DOCOMO Group aims to reformthe structure of society/industry and create new lifestyles. We interviewed Keigo
Kajimura, senior executive vice president of NTT Communications, which isresponsible for the enterprise business, about the initiatives he is focusing on andhis beliefs as a top executive.

Feature Articles
Toward Quantum Technology Innovation

Expectations and Prospects for Innovation in Quantum
Technology▼Abstract
NTT laboratories have been engaged in basic
research on various quantum-related
technologies, including quantum information,
since the mid-1980s before research on quantum
computers took off. The Feature Articles in thisissue present the latest global trends in quantum
technology and NTT’s research portfolio
regarding quantum technology. In addition toquantum computing, quantum sensing andquantum networks are also extensively
discussed from both experimental and theoreticalperspectives.

Classical mechanics:
Newtonian mechanics (1687)
ddt(mv) = F

In the macroscopic (real) world, objects,
particles, etc. exist with certainty ata certain position x.

Quantum mechanics (1900 −)i∂ψ (r,t )
∂t

2

=–2m

∆ + V (r)

ψ (r,t )→ In the microscopic world, this certainty
breaks down (uncertainty principle).

Regular Articles

Identification of Transcription Factors and the Regulatory Genes
Involved in Triacylglycerol Accumulation in a Unicellular Red Alga
▼Abstract
Triacylglycerols (TAGs) generated by microalgae are a raw material for liquid biofuel production, soincreasing the amount of TAGs generated will contribute to reducing the environmental impact of, forexample, greenhouse gas emissions. Since transcription factors (TFs) regulate the expression of a group ofgenes with related functions, it is thought that TAG accumulation can be enhanced by identifying TFs
involved in TAG accumulation and enhancing their functionality. In this study, my research colleagues and Iused transcriptomic and phosphoproteomic data—obtained under conditions of TAG accumulation in aunicellular red alga, Cyanidioschyzon merolae, to identify 14 TFs that may regulate TAG accumulation. To
verify the function of these TFs, we constructed functionally enhanced strains overexpressing each TF andanalyzed changes in TAG accumulation. The analysis results indicate that the amount of TAGs regarding thefour overexpressing strains increased 2.2 to 3.8 times compared with that regarding the control strain, so wecan consider that those four TFs are involved in TAG accumulation.