Theory of quantum synchronization in a small Josephson junction array

2014 Fiscal Year Final Research Report

• Project/Area Number: 24510146
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanostructural science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: KAWABATA SHIRO 独立行政法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (30356852)
• Co-Investigator(Renkei-kenkyūsha): KATO Takeo 東京大学, 物性研究所, 准教授 (80332956) ; KAKEYA Itsuhiro 京都大学, 工学研究科, 准教授 (80302389) ; KASHIWAYA Hiromi 産業技術総合研究所, 計測フロンティア研究部門, 主任研究員 (60443181)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 巨視的量子現象 / 同期現象 / テラヘルツ波 / ジョセフソン接合 / メタマテリアル / 高温超伝導 / 非線形光学 / 量子コンピュータ

Outline of Final Research Achievements

We have theoretically and numerically investigated the synchronization and macroscopic quantum phenomena in a Josephson junction array. By solving the phase, Maxwell, and heat diffusion equation simultaneously, we found that the THz radiation power from the high-Tc superconductor intrinsic Josephson junction can be drastically enhanced by the local heating. We have also investigated the macroscopic quantum phenomena in multi-band superconductor junctions as well as the nonlinear optical responce in superconductor quantum metamaterial based on a superconductor qubit array.

Free Research Field

物性理論, 量子情報科学, 非線形物理