Ashutosh Marwah

Email: ashutosh.marwah (at) outlook.com

Github: goforashutosh

Hi, I am a cryptography researcher at Ingonyama. My work looks into the efficient implementation of cryptography, especially zero-knowledge protocols.

Education

I completed my PhD in Computer Science in the field of quantum information theory and cryptography under the supervision of Frédéric Dupuis at the University of Montreal. My thesis titled An exploration of approximation chains identified approximation structures which frequently occur in quantum protocols and developed techniques for their analysis.

PhD thesis: link, pdf

Prior to this, I completed my master’s at the Institute for Quantum Computing, University of Waterloo working with Norbert Lütkenhaus and my bachelor’s at the Indian Institute of Technology, Delhi.

Master’s thesis: link, pdf

Recent

  1. Let’s Labrador: an Ingonyama blog post explaining the Labrador zkSNARK.
  2. Preprint for “Security proof for parallel DIQKD” arXiv:2507.03991 released.

Publications

  1. Ashutosh Marwah and Frédéric Dupuis. Security proof for parallel DIQKD (preprint). arXiv:2507.03991 (2025)
  2. Ashutosh Marwah and Frédéric Dupuis. Universal chain rules from entropic triangle inequalities (preprint). arXiv:2412.06723 (2024)
    • Presentation at BIID 2024: pptx
  3. Ashutosh Marwah and Frédéric Dupuis. Proving security of BB84 under source correlations (preprint). arXiv:2402.12346 (2024)
    • Presentation at QKD workshop in IQC: pptx
  4. Ashutosh Marwah and Frédéric Dupuis. Smooth min-entropy lower bounds for approximation chains. Commun. Math. Phys. 405, 211 (2024)
    • Presentation for SRS Quantum Information/ BIID 2023: pptx
  5. Ashutosh Marwah and Frédéric Dupuis. Uniform continuity bound for sandwiched Rényi conditional entropy. Journal of Mathematical Physics, 63(5):052201 (2022)
  6. Ashutosh Marwah and Dave Touchette. Optical quantum communication complexity in the simultaneous-message-passing model. Phys. Rev. A 102, 062608 (2020)
  7. Norbert Lütkenhaus, Ashutosh Marwah and Dave Touchette. Erasable Bit Commitment From Temporary Quantum Trust. IEEE Journal on Selected Areas in Information Theory, vol. 1, no. 2, pp. 536-554 (2020).
  8. Ashutosh Marwah and Norbert Lütkenhaus. Characterization of Gram matrices of multi-mode coherent states. Phys. Rev. A 99, 012346 (2019).

Selected Projects

  1. Halo2-svd: A library for singular value decomposition (SVD) verification and matrix operations in Halo2. Developed as a part of Axiom Open Source Program (Oct 2023).
  2. secretBallot: A single stage private voting application with recursive vote aggregation on MINA blockchain. Developed during ZKP/Web3 hackathon organized by UC Berkeley (May 2023).

Miscellaneous

  1. Let’s Labrador: an Ingonyama blog post explaining the Labrador zkSNARK.
  2. Presentation on BabySpartan (work by Srinath Setty and Justin Thaler): pptx
  3. Approximately equal measurements result in approximately equal statistics: pdf
  4. Approximate equality of quantum states implies operator inequality in large subspace: link

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