Luowen Qian

Email: l.<lastname>@northeastern.edu or <firstname>@qcry.pt

I am an Assistant Professor at the Khoury College of Computer Sciences at Northeastern University. Previously, I was a postdoc at the CIS Lab at NTT Research, Inc. supervised by Mark Zhandry, and a Ph.D. student at Boston University advised by Ran Canetti. My research interest is mainly on quantum computation and cryptography.

Please apply to Khoury College of Computer Sciences if you are interested in working with me.

Teaching

Publications

  1. Unitary Complexity and the Uhlmann Transformation Problem
    John Bostanci, Yuval Efron, Tony Metger, Alexander Poremba, Luowen Qian, Henry Yuen
    ITCS 2026 [arXiv] (contributed long plenary talk at QIP 2024)
  2. Quantum-Computable One-Way Functions without One-Way Functions
    William Kretschmer, Luowen Qian, Avishay Tal
    STOC 2025 [arXiv] (contributed talk at QIP 2025)
  3. Hard Quantum Extrapolations in Quantum Cryptography
    Luowen Qian, Justin Raizes, Mark Zhandry
    EUROCRYPT 2025 [arXiv]
  4. Unconditionally secure quantum commitments with preprocessing
    Luowen Qian
    CRYPTO 2024 [arXiv] (contributed talk at QIP 2025)
  5. An efficient quantum parallel repetition theorem and applications
    John Bostanci, Luowen Qian, Nicholas Spooner, Henry Yuen
    STOC 2024 [arXiv] (contributed short plenary talk at QIP 2024)
  6. Quantum Cryptography in Algorithmica
    William Kretschmer, Luowen Qian, Makrand Sinha, Avishay Tal
    STOC 2023 [arXiv] (contributed talk at QIP 2023, invited talk at QCrypt 2023)
  7. On the computational hardness needed for quantum cryptography
    Zvika Brakerski, Ran Canetti, Luowen Qian
    ITCS 2023 [ePrint]
  8. Collusion-Resistant Functional Encryption for RAMs
    Prabhanjan Ananth, Kai-Min Chung, Xiong Fan, Luowen Qian
    ASIACRYPT 2022 [ePrint]
  9. Collusion Resistant Copy-Protection for Watermarkable Functionalities
    Jiahui Liu, Qipeng Liu, Luowen Qian, Mark Zhandry
    TCC 2022 [ePrint] (contributed talk at QIP 2023)
  10. Pseudorandom (Function-Like) Quantum State Generators: New Definitions and Applications
    Prabhanjan Ananth, Aditya Gulati, Luowen Qian, Henry Yuen
    TCC 2022 [arXiv] (contributed talk at QCrypt 2022, short plenary talk merged with AQY22 at QIP 2023)
  11. Cryptography from Pseudorandom Quantum States
    Prabhanjan Ananth, Luowen Qian, Henry Yuen
    CRYPTO 2022 [ePrint] (contributed short plenary talk merged with AGQY22 at QIP 2023)
  12. Beating Classical Impossibility of Position Verification
    Jiahui Liu, Qipeng Liu, Luowen Qian
    ITCS 2022 [arXiv]
  13. Tight Quantum Time-Space Tradeoffs for Function Inversion
    Kai-Min Chung, Siyao Guo, Qipeng Liu, Luowen Qian
    FOCS 2020 [arXiv] (invited keynote at TQC 2021)
  14. Lower Bounds for Function Inversion with Quantum Advice
    Kai-Min Chung, Tai-Ning Liao, Luowen Qian
    ITC 2020 [arXiv]
  15. Adaptively Secure Garbling Schemes for Parallel Computations
    Kai-Min Chung, Luowen Qian
    TCC 2019 [ePrint]

Selected talks

  1. On Best-Possible One-Time Program
    Cryptography 10 Years Later: Obfuscation, Proof Systems, and Secure Computation Reunion (July 13, 2026) [Slides]; Quantum Meets (June 10, 2026) [Slides]
  2. Impersonating Quantum Secrets over Classical Channels
    YITP Workshop Kyoto Quantum Crypto 2 (October 22, 2025)
  3. Cryptographic Applications of Quantum Computational Advantages
    Stanford QIQC Seminar (May 6, 2025)
  4. Quantum-Computable One-Way Functions without One-Way Functions
    QIP 2025 (February 24, 2025) [Slides]
  5. “One-Way Functions” without One-Way Functions
    Bay Area Crypto Day (November 1, 2024) [Slides]
  6. Unconditionally secure commitments with quantum auxiliary inputs/preprocessing
    QIP 2025 (joint talk with Barak Nehoran; February 27, 2025); CRYPTO 2024 (joint talk with Barak Nehoran; August 20, 2024)
  7. Unconditionally secure quantum commitments with preprocessing
    MIT Cryptography and Information Security seminar (February 16, 2024) [Slides]
  8. An efficient quantum parallel repetition theorem and applications
    STOC 2024 (June 27, 2024); UCSD Theory Seminar (January 29, 2024) [Slides]
  9. Quantum Cryptography in Algorithmica
    STOC 2023 (June 23, 2023); A special crypto day in honor of Ran Canetti on the occasion of his 60th birthday (May 12, 2023)
  10. Quantum pseudorandomness in Algorithmica, and its implications to cryptography and complexity
    Minimal Complexity Assumptions for Cryptography workshop @ Simons Institute (May 5, 2023)
  11. Cryptography from Quantum Pseudorandomness
    IQC Math and Computer Science Seminar (March 9, 2023) [Slides]
  12. On the computational hardness needed for quantum cryptography
    ITCS 2023 (January 12, 2023); QCW 2022; Third Kyoto Workshop on Quantum Information, Computation, and Foundations (October 18, 2022) [Slides]; MIT Cryptography and Information Security seminar (September 30, 2022)
  13. Cryptography from Pseudorandom Quantum States
    QCrypt 2022 contributed talk (August 29, 2022) [Video, Slides]; CRYPTO 2022 (August 15, 2022) [Video abstract, Slides, Recording]; UC Berkeley Theory CS Seminar (January 11, 2022) [Slides]
  14. Beating Classical Impossibility of Position Verification
    QCW 2022; QIP 2022 contributed talk (March 10, 2022) [Recording]; Ottawa QUASAR seminar (March 4, 2022); ITCS 2022 (February 2, 2022) [Video, Recording]; Charles River Crypto Day (November 19, 2021); BUsec Seminar (September 29, 2021) [Slides]

Manuscripts

  1. On Best-Possible One-Time Programs
    Aparna Gupte, Jiahui Liu, Luowen Qian, Justin Raizes, Bhaskar Roberts, Mark Zhandry
    [arXiv]
  2. Impersonating Quantum Secrets over Classical Channels
    Luowen Qian, Mark Zhandry
    [arXiv]
  3. Nonuniform Linear Depth Circuits Decide Everything
    Luowen Qian
    For April Fool's day, 2020 [viXra]

Misc

CVE-2021-0980

GitHub

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