Symmetry property and entangled atom-pair formation in the photodissociation of doubly excited hydrogen molecules

• Project/Area Number: 17K05744
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Hosaka Kouichi 東京工業大学, 理学院, 助教 (00419855)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 量子もつれ / 光解離 / 水素分子 / もつれ / 分子の光解離

Outline of Final Research Achievements

Photofragments are potentially entangled because the symmetry property of precursor molecular states should be succeeded into fragment pairs. However, the entanglement between photofragments has not been verified long time. Experimentally observed angular correlation of two fluorescence photons emitted from H(2p) atoms produced in the photodissociation of hydrogen molecules did not reproduce the theoretical prediction. In the present work, the state of the atom pair has been determined with measuring the angular correlation of two fluorescence photons in a wide angular range and with considering the spin-orbit coupling in the dissociation pathways.

Academic Significance and Societal Importance of the Research Achievements

“もつれ”は量子力学の核心であり、現在、盛んに研究が行われている量子暗号や量子計算以外にも幅広い領域でブレークスルーを起こす可能性を秘めている。しかし、分子科学においては非局所的な相関、“もつれ”に着目した研究は行われていなかった。本研究により、分子科学の標準的なツールである光解離を用いた“もつれ”フラグメント対生成が明らかになった。今後、分子における“もつれ”の理解が更に進むことで、新しい分子技術に利用されていくことが期待される。

Research Products

• [Int'l Joint Research] カッセル大学(ドイツ)
• [Int'l Joint Research] カッセル大学(ドイツ)
• [Int'l Joint Research] オウル大学(フィンランド)
• [Journal Article] Entangled pairs of 2p atoms produced in photodissociation of H2 and D2 (2019)
  • Author(s): Torizuka Yutaro、Hosaka Kouichi、Schmidt Philipp、Odagiri Takeshi、Knie Andre、Ehresmann Arno、Kougo Ryoko、Kitajima Masashi、Kouchi Noriyuki
  • Journal Title: Physical Review A Volume: 99 Issue: 6 Pages: 063426-063426
  • DOI: 10.1103/physreva.99.063426
  • Peer Reviewed
• [Journal Article] Breaking space-inversion symmetry in the dynamics of the doubly excited Q21Πu(1) state of HD (2019)
  • Author(s): Hosaka Kouichi、Torizuka Yutaro、Schmidt Philipp、Knie Andre、Ehresmann Arno、Odagiri Takeshi、Kitajima Masashi、Kouchi Noriyuki
  • Journal Title: Physical Review A Volume: 99 Issue: 3 Pages: 033423-033423
  • DOI: 10.1103/physreva.99.033423
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The observation of the pair of Lyman-α and Lyman-β photons produced in the photodissociation of H2 (2017)
  • Author(s): K. Hosaka, Y. Torizuka, P. Schmidt, T. Odagiri, A. Knie, K. Jankala, A. Ehresmann, M. Kitajima and N. Kouchi
  • Journal Title: Journal of Physics: Conference Series Volume: Volume 875 Pages: 032002-032002
  • DOI: 10.1088/1742-6596/875/4/032002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] もつれ原子ペア生成の実証実験 -水素分子の光解離を例として- (2019)
  • Author(s): 鳥塚祐太郎，穂坂綱一，Philipp Schmidt，小田切丈，Andre Knie, Arno Ehresmann, 向後陵子, 北島昌史, 河内宣之
  • Organizer: 第13回分子科学討論会2019福岡
• [Presentation] もつれ原子ペアの自発的生成 -水素分子の光解離を例として- (2019)
  • Author(s): 鳥塚祐太郎，穂坂綱一，Philipp Schmidt，小田切丈，Andre Knie, Arno Ehresmann, 向後陵子, 北島昌史, 河内宣之
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] Are entangled atom-pairs produced in the photodissociation of H2 (2019)
  • Author(s): 鳥塚祐太郎，穂坂綱一，Philipp Schmidt，小田切丈，Andre Knie, Arno Ehresmann, 向後陵子, 北島昌史, 河内宣之
  • Organizer: 第35回化学反応討論会
  • Int'l Joint Research
• [Presentation] 分子解離でもつれ原子ペアが生まれるか？ (2018)
  • Author(s): 鳥塚祐太郎，穂坂綱一，Philipp Schmidt，小田切丈，Andre Knie，Kari Jankala，Arno Ehresmann，向後陵子，北島昌史，河内宣之
  • Organizer: 原子衝突学会第43回年会