TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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Volume 53, Issue 5
Displaying 1-8 of 8 articles from this issue
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Preface
Feature: Superconducting Electronics Technologies for Realizing the Quantum Computers and the Quantum Annealing Machines
Review Articles
  • Recent Developments in Quantum Computers and Quantum Annealing Machines
    ―The dawn of a Quantum 2.0 era―
    Shiro KAWABATA
    2018 Volume 53 Issue 5 Pages 271-277
    Published: September 20, 2018
    Released on J-STAGE: October 27, 2018
    DOIhttps://doi.org/10.2221/jcsj.53.271
    JOURNAL FREE ACCESS
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    Quantum computers and quantum annealing machines are promising for efficiently solving mathematical problems that are currently intractable by exploiting quantum mechanical principles. Recently, rapid developments based on superconducting quantum electronics have been made in a technology for such quantum machines. In addition, big IT companies such as Google, IBM, Intel, and Microsoft are now investing heavily in this quantum technology. In this article, we will discuss recent developments in quantum computers and quantum annealing machines.

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  • Fundamentals and Leading Edge of Superconducting Quantum Computing
    Hiroto MUKAI, Akiyoshi TOMONAGA, Jaw-Shen TSAI
    2018 Volume 53 Issue 5 Pages 278-286
    Published: September 20, 2018
    Released on J-STAGE: October 27, 2018
    DOIhttps://doi.org/10.2221/jcsj.53.278
    JOURNAL FREE ACCESS
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    Research towards the realization of superconducting quantum computers is progressing rapidly. Recently, the number of integrated quantum bits (qubits) has begun to exceed 50 bits, and such quantum system has the potential capability to surpass that of any classical computer (quantum supremacy). To improve gate fidelity, research on qubits and surrounding environments are actively being studied. Which superconducting circuit will become the platform for quantum computers? What kind of technologies and theory will be used for quantum computers? In this paper, we cover many issues leading towards the realization of quantum computing systems.

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Focused Reviews
  • Basics and Applications of Quantum Annealing
    Shu TANAKA, Kotaro TANAHASHI, Tomomitsu MOTOHASHI, Shinichi TAKAYANAGI
    2018 Volume 53 Issue 5 Pages 287-294
    Published: September 20, 2018
    Released on J-STAGE: October 27, 2018
    DOIhttps://doi.org/10.2221/jcsj.53.287
    JOURNAL FREE ACCESS
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    Quantum annealing (QA) is a promising calculation method for obtaining a better solution to combinatorial optimization problems. QA is a natural computation technique proposed in the context of statistical physics in 1998. In 2011, the world's first commercial machine realizing QA experimentally was released. After that, the development of hardware and software has been exhaustive, and the studies on application search have been done using commercial QA machines. In this paper, we first explain the basics of QA without assuming the knowledge of statistical physics and quantum physics. We also show a couple of examples of application studies on QA. In addition, existing problems and overcoming other methods are explained.

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  • Fabrication Technologies for Superconducting Quantum Circuits for Large-scale Quantum Computing
    Hirotaka TERAI, Wei QIU, Taro YAMASHITA
    2018 Volume 53 Issue 5 Pages 295-305
    Published: August 20, 2018
    Released on J-STAGE: October 27, 2018
    DOIhttps://doi.org/10.2221/jcsj.53.295
    JOURNAL FREE ACCESS
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    The superconducting qubit technology based on Josephson junctions is a promising platform for realizing quantum computers. Since being first demonstrated, the coherence time of superconducting qubits has improved from 10 ns to 100 μs over the past 18 years. As a result, high-fidelity qubit operations in a scalable architecture are now becoming possible. In this article, we introduce recent progress in the fabrication process of superconducting qubits for large-scale quantum computation.
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