Ken Mochizuki

Key words:

Open systems, PT symmetry, Topological phases, Quantum walks, Nonlinear syatems

E-mail:

ken_mochizuki[at]eng.hokudai.ac.jp

Address:

Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan, Faculty of Engineering, A2-66

Affiliation:

04/2012-03/2016: Undergraduate Student at Hokkaido University

03/2016-09/2017: Master Student at Hokkaido University

09/2017-09/2020: Ph.D Student at Hokkaido University

04/2018-03/2021: JSPS Research Fellowships for Young Scientists

04/2021-: Ozawa Group in AIMR at Tohoku University

Publications

  1. "Bulk-edge correspondence in nonunitary Floquet systems with chiral symmetry"
    Ken Mochizuki, Dakyeong Kim, Norio Kawakami, and Hideaki Obuse
    *Physical Review A 102, 062202 (2020). *arXiv:1609.09650.
  2. "Statistical properties of eigenvalues of the non-Hermitian Su-Schrieffer-Heeger model with random hopping terms"
    Ken Mochizuki, Naomichi Hatano, Joshua Feinberg, and Hideaki Obuse
    *Physical Review E 102, 012101 (2020). *arXiv:2005.02705.
  3. "Topological Quantum Walk with Discrete Time-Glide Symmetry"
    Ken Mochizuki, Takumi Bessho, Masatoshi Sato, and Hideaki Obuse
    *Physical Review B 102, 035418 (2020). *arXiv:2004.09332.
  4. "Stability of topologically protected edge states in nonlinear quantum walks: Additional bifurcations unique to Floquet systems"
    Ken Mochizuki, Norio Kawakami, and Hideaki Obuse
    *Journal of Physics A: Mathematical and Theoretical 53, 085702 (2020). *arXiv:1907.08464.
  5. "Bulk-edge correspondence and stability of multiple edge states of a non-unitary three-step quantum walk with PT symmetry"
    Makio Kawasaki, Ken Mochizuki, Norio Kawakami, and Hideaki Obuse
    *Progress of Theoretical and Experimental Physics, ptaa034 (2020). *arXiv:1905.11089.
  6. "Observation of topological edge states in parity-time-symmetric quantum walks"
    L. Xiao, X. Zhan, Z. H. Bian, K. K. Wang, X. Zhang, X. P. Wang, J. Li, K. Mochizuki, D. Kim, N. Kawakami, W. Yi, H. Obuse, B. C. Sanders, and P. Xue
    *Nature Physics 13, 1117 (2017).
  7. "Effects of Disorder on Non-unitary PT Symmetric Quantum Walks"
    Ken Mochizuki and Hideaki Obuse
    *Interdisciplinary Information Sciences 23, 95 (2017). *arXiv:1608.00719.
  8. "Explicit definition of PT symmetry for nonunitary quantum walks with gain and loss"
    Ken Mochizuki, Dakyeong Kim, and Hideaki Obuse
    *Physical Review A 93, 062116 (2016). *arXiv:1603.05820.

Conferences

Only international conferences:

  1. Ken Mochizuki, Norio Kawakami, and Hideaki Obuse (oral,X46)
    “Stability of topological edge states in nonlinear quantum walks: Bifurcations unique to Floquet systems”
    American Physical Society March Meeting 2021, March 15-19, online
  2. Ken Mochizuki, Naomichi Hatano, Joshua Feinberg, and Hideaki Obuse (poster,06.0)
    “Statistical Properties of the Non-Hermitian SSH Model and Symmetry Inheritance owing to Real Spectra”
    American Physical Society March Meeting 2021, March 15-19, online
  3. Ken Mochizuki, Naomichi Hatano, Joshua Feinberg, and Hideaki Obuse (oral,T4-09)
    “Statistical Properties of the Non-Hermitian SSH Model and Symmetry Inheritance owing to Real Spectra”
    Localization 2020, August 24-29, online
  4. Ken Mochizuki, Takumi Bessho, Masatoshi Sato, and Hideaki Obuse (poster,PB-32)
    “Time-glide symmetric topological quantum walk”
    International Conference on Topological Materials Science, December 3-7, 2019, Kyoto University
  5. Ken Mochizuki, Naomichi Hatano, Joshua Feinberg, and Hideaki Obuse (poster)
    “Statistical properties of eigenvalues in a non-Hermitian SSH model with random hopping terms”
    Workshop NH2019, November 28-29, 2019, Institute of Industrial Science, University of Tokyo
  6. Ken Mochizuki, Norio Kawakami, and Hideaki Obuse (oral,invited)
    “The stability of topological edge states in non-linear quantum walks:
    Bifurcations unique to Floquet systems, revealed from non-unitary time-evolution operators”
    Workshop NH2019, August 8-9, 2019, Institute of Industrial Science, University of Tokyo
  7. Ken Mochizuki, Norio Kawakami, and Hideaki Obuse (poster,P5)
    “Bifurcations of topological edge states in non-linear quantum walks: originating from unique features to Floquet non-linear systems”
    META2019, The 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics, July 23-26, 2019, Instituto Superior Técnico, Portugal
  8. Ken Mochizuki, Norio Kawakami, and Hideaki Obuse (poster)
    “PT symmetry and stability of edge states in nonlinear quantum walks”
    Pseudo-Hermitian Hamiltonians in Quantum Physics, June 04-13, 2018, Ramanujan Lecture Hall, ICTS Bangalore, Karnataka, India
  9. Ken Mochizuki and Hideaki Obuse (poster,P42)
    “PT symmetry and pseudo-unitarity of nonunitary quantum walks”
    8th International Conference on Metamaterials, Photonic Crystals and Plasmonics, July 25-28, 2017, Songdo Convensia, Incheon-Seoul, South Korea
  10. Hideaki Obuse, Ken Mochizuki, Dakyeong Kim, and Norio Kawakami (oral)
    “Floquet Topological Phases in PT Symmetric Passive Hadamard Quantum Walks”
    8th International Conference on Metamaterials, Photonic Crystals and Plasmonics, July 25-28, 2017, Songdo Convensia, Incheon-Seoul, South Korea
  11. Hideaki Obuse, Ken Mochizuki, Dakyeong Kim, and Norio Kawakami (oral)
    “Floquet Topological Phases in PT symmetric Quantum Walks with Gain and Loss”
    CLEO / Europe-EQEC 2017, June 25-29, 2017, Munich, Germany
  12. Hideaki Obuse, Ken Mochizuki, Dakyeong Kim, and Norio Kawakami (oral)
    “Floquet topological phases in PT symmetric non-unitary quantum walks: theory and experiment”
    Non-Hermitian Hamiltonians in Physics: Theory and Experiment, May 15-19, 2017, Bad Honnef, Germany
  13. H. Obuse, K. Mochizuki, D. Kim, N. Kawakami, L. Xiao, X. Zhan, Z. H. Bian, K. K. Wang, X. Zhang, X. P. Wang, J. Li, W. Yi, B. Sanders, P. Xue (oral)
    “Observation of edge states of Floquet topological phases in PT symmetric quantum walks”
    International Conference on Topological Material Science 2017, May 9-13, 2017, Tokyo Institute of Technology
  14. Ken Mochizuki, Dakyeong Kim, Norio Kawakami, and Hideaki Obuse (poster,15)
    “Topological phases in PT symmetric nonunitary quantum walks”
    International School on Topological Science and Topological Matters, February 13-18, 2017, Kyoto University
  15. Hideaki Obuse, Ken Mochizuki, Dakyeong Kim, and Norio Kawakami (oral)
    “Floquet Topological Phases Driven by PT Symmetric Non-unitary Time Evolution”
    Topological Material Science 2 nd Annual Meeting, December 12-18, 2016, Tohuku University
  16. Ken Mochizuki and Hideaki Obuse (poster,Pos-8)
    “PT symmetry for nonunitary quantum walks and the extension to disordered systems”
    Progress in Quantum Physics with Non-Hermitian Operator, August 08-12, 2016, Kyoto University
  17. Hideaki Obuse, Ken Mochizuki, Dakyeong Kim, and Norio Kawakami (oral)
    “Floquet topological phases of non-unitary quantum walks with PT symmetry”
    Progress in Quantum Physics with Non-Hermitian Operator, August 08-12, 2016, Kyoto University
  18. Ken Mochizuki, Dakyeong Kim, and Hideaki Obuse (poster)
    “Topological phases and enhancement of edge states in PT symmetric quantum walks with gain and loss”
    Workshop of Quantum Simulation and Quantum Walks 2015, November 16-18, Yokohama National University