Timothy Hsieh | Perimeter Institute

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

Kumar, T. A., Balents, L., Hsieh, T. H., & Melko, R. G. (2026). Autoregressive typical thermal states. Annals of Physics, 487, 170362. doi:10.1016/j.aop.2026.170362
Kumar, T. A., Zou, Y., Negari, A. -R., Melko, R. G., & Hsieh, T. H. (2026). Unlearnable phases of matter. doi:10.48550/arxiv.2602.11262
Sang, S., Zou, Y., & Hsieh, T. H. (2026). Mixed-state Quantum Phases: Renormalization and Quantum Error Correction. doi:10.48550/arxiv.2310.08639
Negari, A. -R., Sahu, S., Behrends, J., Béri, B., & Hsieh, T. H. (2026). Critical non-equilibrium phases from noisy topological memories. doi:10.48550/arxiv.2601.10792
Zhang, Z., Zou, Y., Hsieh, T. H., & Vijay, S. (2025). Universal Properties of Critical Mixed-States from Measurement and Feedback. PRX Quantum, 6(4), 040363. doi:10.1103/66zv-8k1t
Kumar, T. A., Balents, L., Hsieh, T. H., & Melko, R. G. (2025). Autoregressive Typical Thermal States. doi:10.48550/arxiv.2508.13455
Sang, S., Lessa, L. A., Mong, R. S. K., Grover, T., Wang, C., & Hsieh, T. H. (2025). Mixed-state phases from local reversibility. doi:10.48550/arxiv.2507.02292
Negari, A. -R., Ellison, T. D., & Hsieh, T. H. (2025). Spacetime Markov length: a diagnostic for fault tolerance via mixed-state phases. doi:10.48550/arxiv.2412.00193
Zhang, Y., Hsieh, T. H., Kim, Y. B., & Zou, Y. (2025). Probing mixed-state phases on a quantum computer via Renyi correlators and variational decoding. https://arxiv.org/abs/2505.02900v1
Lessa, L. A., Sang, S., Lu, T. -C., Hsieh, T. H., & Wang, C. (2025). Higher-form anomaly and long-range entanglement of mixed states. doi:10.48550/arxiv.2503.12792
Zhang, Z., Zou, Y., Hsieh, T. H., & Vijay, S. (2025). Universal Properties of Critical Mixed States from Measurement and Feedback. https://arxiv.org/abs/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
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., Hsieh, T. H., & Zou, Y. (2024). Approximate quantum error correcting codes from conformal field theory. doi:10.48550/arxiv.2406.09555
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
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
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
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. (2023). 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

Seminars

Decodable and unlearnable phases of matter, 2026 American Physical Society Global Physics Summit invited talk, 2026/03/19
Decodable and unlearnable phases of matter, MIT Chez Pierre seminar series, MIT, 2026/03/13
Decodable and unlearnable phases of matter, Harvard, 2026/03/12
Decodable and Unlearnable Phases and Transitions, Colloquium, 2026/03/11, PIRSA:26030062
Markov length: from mixed-state phases to fault tolerance, CTQM Colloquium, CU Boulder, University of Colorado Boulder, Boulder, United States, 2025/10/31
MIxed-state phases, Tutorial, KITP program on “Noise-robust Phases of Quantum Matter", University of California, Santa Barbara, Santa Barbara, United States, 2025/08/21
Markov length: from mixed-state phases to fault tolerance, Quantum Matter and Information workshop, University of Chicago, University of Chicago, Chicago, United States, 2025/06/02
Markov length: from mixed-state phases to fault tolerance, U. de Montreal condensed matter seminar, Université de Montréal, Montreal, Canada, 2025/05/30
Markov length: from mixed-state phases to fault tolerance, MIT Chez Pierre Seminar, MIT, 2025/04/28
Markov length: from mixed-state phases to fault tolerance, Boston College Physics Seminar, Boston College, 2025/04/24
Markov length: from mixed-state phases to fault tolerance, Princeton Quantum Colloquium, Princeton, 2025/04/21
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