Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Volume 73 , Issue 12
Showing 1-21 articles out of 21 articles from the selected issue
Preface
Contents
Reviews
Researches
  • Atsushi Noguchi, Ayato Okada, Rekishu Yamazaki, Yasunobu Nakamura
    Type: Researches
    2018 Volume 73 Issue 12 Pages 852-858
    Published: December 05, 2018
    Released: June 24, 2019
    JOURNALS RESTRICTED ACCESS

    We describe our current efforts to investigate coherent coupling between surface acoustic waves (SAW) and electromagnetic waves in both optical and microwave regimes. We develop a hybrid quantum system consisting of a microwave resonator, a superconducting qubit, and a SAWresonator. The coherent coupling between the circuit components enables us to measure the SAW amplitude near the quantum level. We also describe a cavity optomechanical system formed with a SAW resonator inserted inside an optical cavity. The system provides a possibility to build a coherent interface between the microwave and optical photon at the single-photon level. It is an important building block for the construction of quantum information networks.

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  • Fumihiko Sugino
    Type: Researches
    2018 Volume 73 Issue 12 Pages 859-863
    Published: December 05, 2018
    Released: June 24, 2019
    JOURNALS RESTRICTED ACCESS

    In this article, I discuss solvable spin chain models which exhibit extensive entanglement entropy scaling as a square root or a linear of the volume. They provide counterexamples to a belief that the area law for the entanglement entropy of the ground state can be violated at most logarithmically. I also briefly comment on their meaning in elementary particle physics.

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  • Tadahiko Ishikawa, Shin-ya Koshihara, Masaki Hada
    Type: Researches
    2018 Volume 73 Issue 12 Pages 864-869
    Published: December 05, 2018
    Released: June 24, 2019
    JOURNALS RESTRICTED ACCESS

    Precise time-resolution studies of early-stage photoinduced dynamics are essential to clarify the mechanism of photofunctionality in solid-state materials. A time-resolved electron diffraction technique using sub-picosecond electron pulses was recently developed to measure the diffraction patterns of the photoinduced transient state. In the present study, the abovementioned time-resolved optical and diffraction measurements were analyzed to create a molecular movie that can be directly viewed to better understand photoinduced dynamics in molecular conductors.

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