Study on the quantum coherence in cuprate superconductor

2010 Fiscal Year Final Research Report

• Project/Area Number: 21710100
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Nanostructural science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: KASHIWAYA Hiromi National Institute of Advanced Industrial Science and Technology, エレクトロニクス研究部門, 研究員 (60443181)
• Project Period (FY): 2009 – 2010
• Keywords: 量子情報 / 量子ビット / 銅酸化物超伝導体 / 固有ジョセブソン接合

Research Abstract

Intrinsic Josephson junction made of high-Tc superconductor is one of the most promising candidate for the qubit. In this study, an Bi_2Sr_1.6La_o.4CUO_6+δ IJJ array was used because this sample is a good example for investigating the many body problem in quantum mechanics. The experimental result of the IJJ array showed multi-junction switching (MJS) : several intrinsic Josephson junctions (IJJs) in an array switch to the finite voltage state simultaneously. The number of multi-switching junction was successfully tuned by changing the load resistance serially connected to an BBi_2Sr_1.6La_o.4CUO_6+δ IJJ array.

Research Products

• [Journal Article] Fabrication of weak-link Nb-based nano-SQUIDs by FIB process (2011)
  • Author(s): T.Matsumoto, H.Kashiwaya, H.Shibata, H.Takayanagi, S.Nomura, S.Kashiwaya
  • Journal Title: physica C (掲載確定)
• [Journal Article] C-axis critical current of a PrFeAs_0.7 single crystal, Appl. (2010)
  • Author(s): H.Kashiwaya, K.Shirai, T.Matsumoto, H.Shibata, H.Kambara, M.Ishikado, H.Eisaki, A.Iyo, S.Shamoto, I.Kurosawa
  • Journal Title: Phys.Lett. 96 Pages: 202504-1-202504-3
• [Journal Article] Multi-junction switching in Bi_2Sr_1.6La_0.4CuO_6+δ intrinsic Josephson junctions, Appl. (2010)
  • Author(s): H.Kashiwaya, T.Matsumoto, H.Shibata, H.Eisaki, Y.Yoshida, H.Kambara, S.Kawabata, S.Kashiwaya
  • Journal Title: Phys.Express 3 Pages: 043101-043101-043103
• [Presentation] Bi2201固有ジョセフソン接合のセカンドスイッチの特性 (2010)
  • Author(s): 柏谷裕美、松本哲朗、柴田肇、永崎洋、吉田良行、川畑史郎、田仲由喜夫、柏谷聡
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 20100200
• [Presentation] Switching Properties in Bi2201 Intrinsic Josephson Junctions (2010)
  • Author(s): H.Kashiwaya, T.Matsumoto, H.Shibata, H.Eisaki, Y.Yoshida, S.Kawabata, Y.Tanaka, S.Kashiwaya
  • Organizer: 23rd International Symposium on Superconductivity (ISS2010)
  • Place of Presentation: つくば国際会議場
  • Year and Date: 2010-11-03
• [Presentation] Strong Coupling Effect on MQT of Bi_Sr_1.6La_0.4Cu_O6+δ Intrinsic Josephson Junctions (2009)
  • Author(s): H.Kashiwaya, T.Matsumoto, H.Shibata, H.Eisaki, Y.Yoshida, S.Kawabata, Y.Tanaka, S.Kashiwaya
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity (M2S-IX)
  • Place of Presentation: 京王プラザホテル(東京)
  • Year and Date: 2009-09-08
• [Patent(Industrial Property Rights)] 固有ジョセフソン接合素子、及び、これを用いた量子ビット、超伝導量子干渉素子、テラヘルツ検出器、テラヘルツ発振器、電圧標準装置、ミリ波・サブミリ波受信機、並びに、固有ジョセフソン接合素子の製造方法 (2010)
  • Inventor(s): 柏谷裕美、柏谷聡
  • Industrial Property Number: 特許,特願2010-105228
  • Filing Date: 2010-04-30