著者

Shuntaro Takeda

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2023, pp.230204, 2023 (Released:2023-05-23)

参考文献数

25

---

Among worldwide developments of various quantum-computing hardware platforms, optical quantum computers currently stand out because of their unique approach. Recent progress in optical quantum computing has been remarkable; not only has “quantum supremacy” been achieved by beating supercomputers in specific calculations, but scalable paths to large-scale quantum computers have been discovered. Behind such progress is a new approach that breaks away from the traditional methodology of optical quantum computers. Here, we explain the background of recent progress in optical quantum computers and introduce the development and applications of our original loop-based optical quantum computer based on the new approach.

著者

Kei Hayashi

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2022, pp.220403, 2022 (Released:2022-07-29)

参考文献数

37

---

Thermoelectric (TE) power generation, a potential clean power technology, has attracted significant attention owing to the recent development of high-performance TE materials. We focused on Mg2Sn and aimed to improve its TE performance by preparing single crystals (SCs) and introducing lattice defects. In this paper, experimental results on crystal structure analysis, microstructures, and TE properties are presented. It is demonstrated that the TE performance of Mg2Sn SCs can be superior to that of Mg2Sn polycrystals via lattice-defect engineering.

著者

Yusuke Nakanishi Hong En Lim Yasumitsu Miyata

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2023, pp.230422, 2023 (Released:2023-08-26)

参考文献数

30

---

Transition metal chalcogenides (TMCs) have attracted significant attention in recent years owing to their diverse nanostructures and physical properties. In particular, the progress of growth techniques has enabled the efficient preparation of high-quality two-dimensional (2D) layered TMCs, as well as various one-dimensional (1D) TMCs, such as nanotubes, nanoribbons, and nanowires. In this study, we focus on 1D TMC wires. An overview of recent progress in this area and our findings on vapor-phase growth of isolated single TMC wires and large-area networks of TMC wires are presented.

著者

Hideaki Yamamoto Ayumi Hirano-Iwata Shigeo Sato

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2023, pp.230420, 2023 (Released:2023-07-06)

参考文献数

18

---

The structure and function of complex neuronal networks in the brain can be partially reconstituted in vitro by integrating cell culture and microfluidic device technologies. In this report, we review our recent studies on developing microfluidic devices to reconstitute small neuronal networks bearing a modular structure, which is a canonical structure found in the nervous systems of animals. We also describe the process of recording functional activity from the reconstituted neuronal networks. These fundamental technologies offer novel tools for investigating structure–function relationships in living neuronal networks and exploring the physical basis of biological computing in the brain.

著者

Akira Ohtomo Takuto Soma Kohei Yoshimatsu

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2022, pp.220202, 2022 (Released:2022-08-25)

参考文献数

40

---

In order to induce various electronic phase transitions in strongly correlated electron systems, lithium-ion battery-like electrochemical cells based on highly crystalline epitaxial thin films of transition-metal oxides have been developed. The electronic states of band insulators, Mott insulators, heavy-fermion metals, and superconductors are studied in detail from their transport, optical, and structural properties. This method has become a powerful tool for precise electrochemical doping of single samples and in-situ measurement of modulated electronic states. In this review, we present the results obtained in our previous studies, clarify the effectiveness and scope of application of this method, and look forward to its possible application to electrochemical devices.

著者

Masaya Notomi

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2023, pp.230208, 2023 (Released:2023-07-15)

参考文献数

38

---

Various novel properties are being found in one- and two-dimensional nanomaterials, many of which are considered as promising for photonic applications. However, an issue exists in that the optical interaction cross-section is generally too small, owing to their atomic dimensions. Recently, a number of ways have been proposed and demonstrated for combining them with appropriate nanophotonic platforms to induce strong light confinement, thereby increasing the interactions. This may enable us to employ these novel properties in photonic integrated circuits. This article reviews the results of recent research activities on hybrid nanomaterial–nanophotonic platforms. This technology is promising for future photonic integration, in which we will be able to add various photonic functionalities onto passive Si-based photonic integrated circuits by selectively loading functional nanomaterials.

著者

Michio Okada

出版者

The Japan Society of Applied Physics

雑誌

JSAP Review (ISSN:24370061)

巻号頁・発行日

vol.2022, pp.220409, 2022 (Released:2022-10-04)

参考文献数

11

---

Considering that advanced autonomous robots and autonomous driving systems also have numerous weaknesses and imperfections, why not expose such weaknesses moderately instead of hiding them? In this article, we will discuss how humans and robots may coexist in the future, introducing the concept of “weak robots,” such as Sociable Trash Box that cannot pick up trash by themselves, but do so with the help of children, and conversational robots that sometimes forget important words when telling children old stories.