Ken Mochizuki

Key words：

Open systems, Topological phases, Quantum walks, Nonlinear syatems, Complexity

E-mail：

ken-mochizuki[at]ap.t.u-tokyo.ac.jp

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

04/2021-03/2022: Ozawa Group in AIMR at Tohoku University

04/2022-05/2023: Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team

06/2023: Research Associate of Gong group at Department of Applied Physics in University of Tokyo

Publications

  1. "Transitions of the Lyapunov spectrum and entanglement entropy in monitored quantum dynamics with homogeneous unitary gates"
    Ken Mochizuki and Ryusuke Hamazaki
    ＊arXiv:2503.20217.
  2. "Topology and Spectrum in Measurement-Induced Phase Transitions"
    Hisanori Oshima, Ken Mochizuki, Ryusuke Hamazaki, and Yohei Fuji
    ＊arXiv:2412.11097.
  3. "Threefold Way for Typical Entanglement"
    Haruki Yagi, Ken Mochizuki, and Zongping Gong
    ＊Physical Review Letters 134, 150401 (2025). ＊arXiv:2410.11309.
  4. "Measurement-Induced Spectral Transition"
    Ken Mochizuki and Ryusuke Hamazaki
    ＊Physical Review Letters 134, 010410 (2025). ＊arXiv:2406.18234.
  5. "Multifractality in monitored single-particle dynamics"
    Kohei Yajima, Hisanori Oshima, Ken Mochizuki, and Yohei Fuji
    ＊Physical Review Research 6, 043049 (2024). ＊arXiv:2406.02386.
  6. "Absorption to Fluctuating Bunching States in Non-Unitary Boson Dynamics"
    Ken Mochizuki and Ryusuke Hamazaki
    ＊Physical Review Research 6, 013004 (2024). ＊arXiv:2308.04716.
  7. "Distinguishability Transitions in Non-Unitary Boson Sampling Dynamics"
    Ken Mochizuki and Ryusuke Hamazaki
    ＊Physical Review Research 5, 013177 (2023). ＊arXiv:2207.12624.
  8. "Band structures under non-Hermitian periodic potentials: Connecting nearly-free and bi-orthogonal tight-binding models"
    Ken Mochizuki and Tomoki Ozawa
    ＊Physical Review B 105, 174108 (2022). ＊arXiv:2203.00247.
  9. "Topological phases protected by sublattice symmetry in dissipative quantum systems"
    Makio Kawasaki, Ken Mochizuki, and Hideaki Obuse
    ＊Physical Review B 106, 035408 (2022). ＊arXiv:2201.09283.
  10. "Extrinsic topology of Floquet anomalous boundary states in quantum walks"
    Takumi Bessho, Ken Mochizuki, Hideaki Obuse, and Masatoshi Sato
    ＊Physical Review B 105, 094306 (2022). ＊arXiv:2112.03167.
  11. "Fate of Topological Edge States in Disordered Periodically-driven Nonlinear Systems"
    Ken Mochizuki, Kaoru Mizuta, and Norio Kawakami
    ＊Physical Review Research 3, 043112 (2021) [Editor's Suggestion!]. ＊arXiv:2108.00649.
  12. "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.
  13. "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.
  14. "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.
  15. "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.
  16. "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.
  17. "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).
  18. "Effects of Disorder on Non-unitary PT Symmetric Quantum Walks"
    Ken Mochizuki and Hideaki Obuse
    ＊Interdisciplinary Information Sciences 23, 95 (2017). ＊arXiv:1608.00719.
  19. "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 and Ryusuke Hamazaki (poster,P7)
    “Distinguishability and complexity in monitored dynamics of bosons”
    New Trends in Condensed Matter Theory 2024, December 9-11, ISSP, Kashiwa
  2. Ken Mochizuki and Ryusuke Hamazaki (oral,invited)
    “Measurement-induced spectral transition”
    21st International Workshop on Pseudo-Hermitian Hamiltonians in Quantum Physics, September 22-27, 2024, Chania
  3. Ken Mochizuki and Ryusuke Hamazaki (oral,invited)
    “Bunching states and memory loss in noisy non-unitary dynamics of bosons”
    14th International Conference on Metamaterials, Photonic Crystals and Plasmonics, July 16-19, 2024, Toyama
  4. Ken Mochizuki and Ryusuke Hamazaki (oral)
    “Measurement-induced spectral transition”
    Frontiers in Non-equilibrium Physics 2024, July 1 - August 2, Kyoto
  5. Ken Mochizuki and Ryusuke Hamazaki (oral,B31)
    “Transitions of distinguishability and entanglement in monitored dynamics of bosons”
    American Physical Society March Meeting 2024, March 4-8, Minneapolis
  6. Ken Mochizuki and Ryusuke Hamazaki (poster,P12)
    “Distinguishability and Complexity in Many-Body Non-Unitary Quantum Walks”
    10th International Congress on Quantum Simulation and Quantum Walks, November 10-12, 2023, Tsukuba International Congress Center
  7. Ken Mochizuki and Ryusuke Hamazaki (oral,invited)
    “Distinguishability and Complexity in Non-Unitary Boson Sampling Dynamics”
    10th International Congress on Industrial and Applied Mathematics, August 20-25, 2023, Waseda University
  8. Ken Mochizuki and Ryusuke Hamazaki (poster)
    “Distinguishability and complexity in monitored dynamics of bosons”
    Workshop on Dynamics of Monitored Quantum Many-Body Systems, August 21-25, 2023, International Centre for Theoretical Physics, Italy
  9. Ken Mochizuki and Ryusuke Hamazaki (oral)
    “Distinguishability and complexity in non-unitary boson sampling dynamics”
    STATPHYS28, August 7-11, 2023, Tokyo University
  10. Ken Mochizuki and Ryusuke Hamazaki (oral)
    “complexity transitions of boson sampling dynamics in non-unitary regime”
    Novel Quantum States in Condensed Matter 2022, October 31 - December 2, Kyoto University
  11. Ken Mochizuki, M. Kawasaki, T. Bessho, K. Mizuta, D. Kim, H. Obuse, M. Sato, and N. Kawakami (poster,2.A-7)
    “Nonequilibrium dynamics and symmetry breaking in topological photonic systems”
    Novel Quantum States in Condensed Matter 2022, October 31 - December 2, Kyoto University
  12. Ken Mochizuki, M. Kawasaki, T. Bessho, K. Mizuta, D. Kim, H. Obuse, M. Sato, and N. Kawakami (poster,P19-SF4-05)
    “Nonequilibrium dynamics and symmetry breaking in topological photonic systems”
    29th International Conference on Low Temperature Physics, August 18-24, 2022, Sapporo Convention Center
  13. Ken Mochizuki and Ryusuke Hamazaki (oral,invited)
    “Complexity transitions of boson sampling in non-unitary dynamics”
    Non-Hermitian Quantum Mechanics 2022, July 4, University of Tokyo
  14. Ken Mochizuki, Kaoru Mizuta, and Norio Kawakami (oral,T59)
    “Fate of topological edge states in periodically driven nonlinear systems”
    American Physical Society March Meeting 2022, March 14-18, Chicago & online
  15. Ken Mochizuki, Makio Kawasaki, Kaoru Mizuta, Dakyeong Kim, Hideaki Obuse, Peng Xue’s group, and Norio Kawakami (oral,session-10)
    “Topological edge states in open or nonlinear optical systems”
    Bulk-Edge/Boundary Correspondence 2022, February 11-13, online & University of Tsukuba
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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, International Centre for Theoretical Sciences, India
  24. 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, South Korea
  25. 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
  26. 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
  27. 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