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 Keigo 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 respective roles 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 reform the structure of society/industry and create new lifestyles. We interviewed Keigo Kajimura, senior executive vice president of NTT Communications, which is responsible for the enterprise business, about the initiatives he is focusing on and his beliefs as a top executive.
Front-line Researchers
- Yutaka Miyamoto, NTT Fellow, NTT Network Innovation Laboratories
Abstract
With the increase in video-data distribution, the development of cloud technology, and spread of new information and communication services, such as 5th-generation mobile communications and remote work, information and communication traffic has been increasing and will continue to increase. Implementation of the All-Photonics Network of IOWN (the Innovative Optical and Wireless Network) to meet the demand for diverse services and exponential growth of data traffic will require a huge increase in transmission capacity as well as drastic reductions in power consumption and latency. NTT Fellow Yutaka Miyamoto at NTT Network Innovation Laboratories is pioneering new optical network technology to overcome the capacity crunch. We interviewed him about the progress of his research and what is the best part of being a researcher.
Rising Researchers
- Yasutoshi Ida, Distinguished Researcher, NTT Computer and Data Science Laboratories
Abstract
As one pillar of NTT’s IOWN (Innovative Optical and Wireless Network) vision, Digital Twin Computing aims to construct the world in a digital space. To this end, it is essential that data be obtained from people and things by sensors. However, advances in sensing technologies have created a new issue in which an increase in the number of data dimensions makes processing time longer, which makes it difficult to analyze and use collected data within a realistic period of time. We asked NTT Distinguished Researcher Yasutoshi Ida to tell us about “fast sparse modeling technology” as a means of solving this problem.
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 this issue present the latest global trends in quantum technology and NTT’s research portfolio regarding quantum technology. In addition to quantum computing, quantum sensing and quantum networks are also extensively discussed from both experimental and theoretical perspectives.
- Optical Technologies for Optical Quantum Computing with Continuous Variables
Abstract
Quantum computers are increasingly seen as a potential solution for computing problems that are difficult to solve with conventional technologies. A photon-based quantum computer is a promising technology that enables the development of large-scale, universal quantum computing at high speeds at room temperature with large-scale quantum entanglement thanks to photons’ inherent characteristics. This article explores NTT’s efforts to develop optical quantum computers using optical fiber communication technology.
- Quantum Information Technology Based on Superconducting Quantum Circuits
Abstract
The research on superconducting quantum circuits has expanded greatly, from applications of magnetic field sensors using superconducting quantum interference devices to the development of quantum computers based on superconducting quantum bits (qubits). Superconducting quantum circuits have been progressing rapidly, and as examples of applying these circuits to quantum sensing, this article introduces electron spin resonance spectrometers having high sensitivity and high spatial resolution and an ultrasmall high-sensitivity thermometer operating at extremely low temperatures. As an application to quantum computing, this article also introduces a bosonic qubit that executes quantum error correction using the many degrees of freedom within a superconducting resonator.
- Optical-lattice-clock-network Technology for Gravitational Potential Sensing
Abstract
Optical lattice clocks have an ultrahigh frequency accuracy that exceeds that of cesium atomic clocks by a few orders of magnitude, enabling quantum sensing of gravitational potential equivalent to an altitude difference of only 1 cm on the Earth’s surface. An optical-lattice-clock network, in which multiple optical lattice clocks are interconnected by optical fibers, is expected to become a new infrastructure, such as for a real-time sensing network of crustal movements with 1-cm-level accuracy. In this article, we introduce the elemental technologies comprising an optical-lattice-clock network. We also report on the construction of the ultrahigh-precision optical frequency transmission fiber link in the Tokyo metropolitan area and the experiment to evaluate its transmission stability.
- Extracting Quantum Power by Using Algorithms and Their Verification
Abstract
Quantum computers are expected to increase computational speed compared with current and future computers that work in accordance with the conventional computational principle and to revolutionize information processing. Such an increase in speed is achieved using quantum algorithms that extract computational power from quantum-computer hardware. This article briefly introduces our recent results on quantum algorithms, quantum-circuit optimization to support their efficient implementation, and quantum-circuit verification necessary for their reliable execution.
- Improving the Performance of Quantum Key Distribution
Abstract
Encryption is an essential technology for secure communications. Quantum key distribution (QKD) can enable ultimately secure cryptographic communications by using quantum mechanics. Toward secure networks using QKD, NTT has been conducting various studies from theoretical security analysis to experimental control of optical quantum states. In this article, we introduce our recent activities on QKD using multi-valued information (high-dimensional QKD) and a scalable measurement device for improving its error robustness.
- Toward a Quantum Internet
Abstract
A quantum internet holds promise for accomplishing quantum metrology and quantum computer networks as well as quantum communication among arbitrary clients all over the globe. Its actualization is an important long-term scientific and technological goal. In this article, I explain what a quantum internet is and what is needed for its actualization as well as recent relevant progress in the field of quantum information.
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, so increasing the amount of TAGs generated will contribute to reducing the environmental impact of, for example, greenhouse gas emissions. Since transcription factors (TFs) regulate the expression of a group of genes 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 I used transcriptomic and phosphoproteomic data—obtained under conditions of TAG accumulation in a unicellular 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 and analyzed changes in TAG accumulation. The analysis results indicate that the amount of TAGs regarding the four overexpressing strains increased 2.2 to 3.8 times compared with that regarding the control strain, so we can consider that those four TFs are involved in TAG accumulation. Transcriptome analysis of each of the four TF overexpression strains showed that among the group of genes related to TAG synthesis, only a gene-encoding endoplasmic reticulum-localized lysophosphatidic acid acyltransferase 1 (LPAT1) significantly enhanced. In strains that overexpressed LPAT1 and enhanced its functionality, TAG accumulation increased 3.3 times compared with that in the control strain. These results (i) explain the mechanism by which four types of TFs regulate the TAG amount in C. merolae by altering the expression of a group of target genes, including LPAT1, and (ii) indicate that enhancing TAG accumulation by strengthening functionality TF is useful.
Global Standardization Activities
- Recent Activities of QoE-related Standardization in ITU-T SG12
Abstract
This article introduces recent standardization activities related to the evaluation of the quality of experience (QoE) of speech, audiovisual, and other new services such as extended reality and chatbots, focusing on the activities of the Study Group 12 of the International Telecommunication Union - Telecommunication Standardization Sector (ITU-T SG12), which is responsible for standardization work on performance, quality of service, and QoE.
Practical Field Information about Telecommunication Technologies
External Awards
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