Creation of the quantum cat state by using the collisional interaction of Bose-Einstein condensate and estimation of the quantum state

2010 Fiscal Year Final Research Report

• Project/Area Number: 20340103
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: KOZUMA Mikio Tokyo Institute of Technology, 大学院・理工学研究科, 准教授 (10302837)
• Co-Investigator(Renkei-kenkyūsha): HONDA Kazuhito 東京工業大学, 大学院・理工学研究科, 助教 (70408706)
• Project Period (FY): 2008 – 2010
• Keywords: 量子情報

Research Abstract

The purpose of the research is to create the quantum cat state with Bose-Einstein condensate of neutral atomic gas. We constructed the ultra high vacuum system to operate the double magneto-optical trapping and also made the clover-leaf type of the magnetic trap. While the Bose-Einstein condensate of ^<87>Rb atoms was successfully created, it was hard to suppress the residual magnetic field less than 10μG because of the magnetization of the shield box caused by the magnetic trap. We thus started constructing a new setup which creates Bose-Einstein condensate by using only optical trapping technique. We succeeded in constructing a YVO_4 laser with its wavelength of 1.06μm and its power of 10W. Introducing the output power of the YVO_4 laser into the Bow-tie cavity which includes the vacuum glass cell, we succeeded in creating the optical trap whose potential depth is enough deep to catch the laser cooled Rb atoms. It is noted that the system is already surrounded by the magnetic shield and we can keep ultra low residual magnetic field under the operation of the double magneto-optical trapping. The residual magnetic field is less than 10μG and the magnetic gradient is suppressed to 2uG/cm. We are planning to implement our initial purpose by using these experimental setups soon

Research Products

• [Journal Article] (2010)
  • Author(s): Y.Eto, A.Noguchi, P.Zhang, M.Ueda, M.Kozuma
  • Journal Title: Phys.Rev.Lett. 106 Pages: 160501
  • Peer Reviewed
• [Journal Article] (2010)
  • Author(s): M.Takeuchi, N.Takei, K.Doi, P.Zhang, M.Ueda, M.Kozuma
  • Journal Title: Phys.Rev.A 81 Pages: 062308
  • Peer Reviewed
• [Journal Article] (2010)
  • Author(s): N.Takei, M.Takeuchi, Y.Eto, A.Noguchi, P.Zhang, M.Ueda, M.Kozuma
  • Journal Title: Phys.Rev.A 81 Pages: 042331
  • Peer Reviewed
• [Journal Article] (2010)
  • Author(s): M.Arikawa, K.Honda, D.Akamatsu, S.Nagatsuka, K.Akiba, A.Furusawa, M.Kozuma
  • Journal Title: Phys.Rev.A 81 Pages: 021605(R)
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): R.Inoue, T.Yonehara, Y.Miyamoto, M.Koashi, M.Kozuma
  • Journal Title: Phys.Rev.Lett. 103 Pages: 110503
  • Peer Reviewed
• [Journal Article] (2008)
  • Author(s): K.Aiba, K.Kashiwagi, M.Arikawa, M.Kozuma
  • Journal Title: New J.Phys. 11 Pages: 013049
  • Peer Reviewed
• [Presentation] Toward 87Rb BEC at zero magnetic field (2011)
  • Author(s): S.Nagaoka, Y.Yamamoto, M.Nakada, Y.Kasahara, K.Honda, M.Kozuma
  • Organizer: ERATO Macroscopic Quantum Control Conference on Ultra cold Atoms and Molecules (UCAM2011), PS-30
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2011-01-24
• [Book] 基礎からの量子光学-基礎理論から実用化に向けた取り組みまで(第12章光の保存と再生) (2009)
  • Author(s): 上妻幹旺
  • Total Pages: 452-467
  • Publisher: オプトロニクス社
• [Remarks] ホームページ等
  • URL: http://www.phys.titech.ac.jp/laboratory/kozuma.html
• [Remarks]
  • URL: http://www.kozuma.phys.titech.ac.jp/
• [Remarks]
  • URL: http://ultracold.t.u-tokyo.ac.jp/uedaERATO/kozuma/index-j.html