Timothy Hsieh portrait photo

Perimeter Institute for Theoretical Physics

Research Faculty

Areas of research: Quantum Information Quantum Matter

(519) 569-7600 x7633

Teaching Affiliations
If you are interested in working with me as a PhD student, please send me an email at [email protected].
Research Interests
I am interested in quantum dynamics, applications of synthetic quantum systems for quantum simulation, and topological phases of matter. E-mail: [email protected]
Positions Held
  • Moore Postdoctoral Fellow, Kavli Institute for Theoretical Physics, University of California, Santa Barbara, 2015-2018
Awards
  • Early Researcher Award, Ministry of Research, Innovation and Science, Province of Ontario, 2021
Recent Publications
  • Lessa, L. A., Sang, S., Lu, T. -C., Hsieh, T. H., & Wang, C. (2025). Higher-form anomaly and long-range entanglement of mixed states. arxiv:2503.12792v1
  • Zhang, Z., Zou, Y., Hsieh, T. H., & Vijay, S. (2025). Universal Properties of Critical Mixed States from Measurement and Feedback. arxiv:2503.09597v1
  • Sang, S., & Hsieh, T. H. (2025). Stability of Mixed-State Quantum Phases via Finite Markov Length. Physical Review Letters, 134(7), 070403. doi:10.1103/physrevlett.134.070403
  • Moharramipour, A., Lessa, L. A., Wang, C., Hsieh, T. H., & Sahu, S. (2024). Symmetry-Enforced Entanglement in Maximally Mixed States. PRX Quantum, 5(4), 040336. doi:10.1103/prxquantum.5.040336
  • Negari, A. -R., Ellison, T. D., & Hsieh, T. H. (2024). Spacetime Markov length: a diagnostic for fault tolerance via mixed-state phases. arxiv:2412.00193v1
  • Sang, S., Hsieh, T. H., & Zou, Y. (2024). Approximate Quantum Error Correcting Codes from Conformal Field Theory. Physical Review Letters, 133(21), 210601. doi:10.1103/physrevlett.133.210601
  • Sang, S., Zou, Y., & Hsieh, T. H. (2024). Mixed-State Quantum Phases: Renormalization and Quantum Error Correction. Physical Review X, 14(3), 031044. doi:10.1103/physrevx.14.031044
  • Zou, Y., Sang, S., & Hsieh, T. (2024). Approximate quantum error correcting codes from conformal field theory. https://arxiv.org/abs/2407.15914
  • Sang, S., Hsieh, T. H., & Zou, Y. (2024). Approximate quantum error correcting codes from conformal field theory. doi:10.48550/arxiv.2406.09555
  • Sahu, S., Moharramipour, A., Lessa, L., Hsieh, T., & Wang, C. (2024). Symmetry enforced entanglement in maximally mixed states. doi:10.48550/arXiv.2406.08542
  • González-García, S., Sang, S., Hsieh, T. H., Boixo, S., Vidal, G., Potter, A. C., & Vasseur, R. (2024). Random insights into the complexity of two-dimensional tensor network calculations. Physical Review B, 109(23), 235102. doi:10.1103/physrevb.109.235102
  • Sang, S., & Hsieh, T. H. (2024). Stability of mixed-state quantum phases via finite Markov length. doi:10.48550/arxiv.2404.07251
  • Negari, A. -R., Sahu, S., & Hsieh, T. H. (2024). Measurement-induced phase transitions in the toric code. Physical Review B, 109(12), 125148. doi:10.1103/physrevb.109.125148
  • Sang, S., Li, Z., Hsieh, T. H., & Yoshida, B. (2023). Ultrafast Entanglement Dynamics in Monitored Quantum Circuits. PRX Quantum, 4(4), 040332. doi:10.1103/prxquantum.4.040332
  • Sang, S., Zou, Y., & Hsieh, T. H. (2023). Mixed-state Quantum Phases: Renormalization and Quantum Error Correction. doi:10.48550/arxiv.2310.08639
  • Lu, T. -C., Zhang, Z., Vijay, S., & Hsieh, T. H. (2023). Mixed-State Long-Range Order and Criticality from Measurement and Feedback. PRX Quantum, 4(3), 030318. doi:10.1103/prxquantum.4.030318
  • Zou, Y., Sang, S., & Hsieh, T. H. (2023). Channeling Quantum Criticality. Physical Review Letters, 130(25), 250403. doi:10.1103/physrevlett.130.250403
  • Foss-Feig, M., Tikku, A., Lu, T. -C., Mayer, K., Iqbal, M., Gatterman, T. M., . . . Kim, I. H. (2023). Experimental demonstration of the advantage of adaptive quantum circuits. doi:10.48550/arxiv.2302.03029
  • Lin, C. -J., Ye, W., Zou, Y., Sang, S., & Hsieh, T. H. (n.d.). Probing sign structure using measurement-induced entanglement. Quantum, 7, 910. doi:10.22331/q-2023-02-02-910
  • Li, Z., Sang, S., & Hsieh, T. H. (2023). Entanglement dynamics of noisy random circuits. Physical Review B, 107(1), 014307. doi:10.1103/physrevb.107.014307
  • Lu, T. -C., Lessa, L. A., Kim, I. H., & Hsieh, T. H. (2022). Measurement as a Shortcut to Long-Range Entangled Quantum Matter. PRX Quantum, 3(4), 040337. doi:10.1103/prxquantum.3.040337
  • Wang, R., Hsieh, T. H., & Vidal, G. (2022). Bang-bang algorithms for quantum many-body ground states: A tensor network exploration. Physical Review B, 106(19), 195133. doi:10.1103/physrevb.106.195133
Seminars
  • Markov length: from mixed-state phases to fault tolerance, Google Quantum AI seminar, 2025/01/31
  • Markov length: from mixed-state phases to fault tolerance, “Quantum information dynamics and non-equilibrium quantum matter” workshop, Simons Center for Geometry and Physics, Stony Brook University, 2024/12/02
  • Mixed-state long-range entanglement from adaptive circuits, Waterloo-Munich joint workshop, 2024/10/01
  • Measurement-induced phenomena and protocols, Waterloo-Munich Joint Workshop, 2024/10/01, PIRSA:24100050
  • Opening Remarks, Waterloo-Munich Joint Workshop, 2024/09/30, PIRSA:24090182
  • A measured approach toward long-range entangled matter, Colloquium, UC Santa Barbara / Kavli Institute for Theoretical Physics, 2024/04/16
  • Quantum Matter Lecture, Quantum Matter 2023/24, 2024/03/21, PIRSA:24030045
  • Quantum Matter Lecture, Quantum Matter 2023/24, 2024/03/19, PIRSA:24030044
  • Quantum Matter Lecture, Quantum Matter 2023/24, 2024/03/18, PIRSA:24030050
  • Mixed-state long-range entanglement from adaptive circuits, American Physical Society March meeting, 2024/03/08
  • Quantum Matter Lecture, Quantum Matter 2023/24, 2024/03/04, PIRSA:24030048
  • Quantum Matter Lecture, Quantum Matter 2023/24, 2024/02/29, PIRSA:24020031
  • Quantum Matter Lecture, Quantum Matter 2023/24, 2024/02/27, PIRSA:24020030
  • A measured approach toward long-range entangled matter, Colloquium, 2023/11/08, PIRSA:23110055
  • Mixed state quantum phases, renormalization, and decoding, Simons Ultra Quantum Matter Collaboration conference, 2023/09/14
  • Channeling Quantum Criticality, 2023/08/02
  • Opening up quantum criticality, Quantum Interactive Dynamics Workshop, Oxford, 2023/03/28
  • Opening up quantum criticality, Peking University Seminar, 2023/03/27
  • Opening up quantum criticality, Chez Pierre Seminar, MIT, 2023/02/23
  • A measured approach toward long-range entangled matter, Boston College, Boston, United States, 2023/02/22
  • Opening up quantum criticality, Cornell LASSP Seminar, 2023/02/20
  • A measured approach toward long-range entangled matter, Drexel University, Philadelphia, United States, 2023/02/16
  • Probing Sign Structure using Measurement-induced Entanglement, Mathematics-Physics Seminar, Universite de Montreal, University of Montreal, Montreal, Canada, 2022/11/08
  • Non-unitary Shortcuts to Long-Range Entangled Quantum Matter, “New Developments in Tensor Networks and Quantum Computation” conference, Initiative for the Theoretical Sciences, CUNY, City University of New York, New York, United States, 2022/11/04
  • Measurement as a Shortcut to Long-Range Entangled Quantum Matter, Day of Discovery conference, 2022/10/20
  • Perimeter Researcher Talk - 'Measurement as a shortcut to long-range entangled matter', The Day of Discovery, 2022/10/20, PIRSA:22100070
  • Probing Sign Structure using Measurement-induced Entanglement, KITP Conference “NISQ: Advances and Applications”, KITP, UCSB, Santa Barbara, United States, 2022/09/14
  • Probing sign structure using measurement-induced entanglement, Quantum Criticality: Gauge Fields and Matter, 2022/05/18, PIRSA:22050038