Quantum computing researcher building better QLDPC codes and decoders.

• Assistant Research Professor in Electrical and Computer Engineering, University of Arizona.
• Co-leads NSF-funded research on scalable Quantum LDPC codes and decoders.
• Mentors graduate, undergraduate and high-school researchers in quantum error correction theory and software.
• Core Research Areas:
  • Fault-tolerant quantum computation (Constant-overhead with QLDPC codes and reconfigurable neutral atoms)
  • Trapping-set analysis in Quantum LDPC codes (Pioneering study to improve iterative decoders)
  • Soft-syndrome iterative decoders (Soft syndrome decoders)
  • Hardware-aware low-latency architectures (Low-complexity Decoders)

Fault-tolerant quantum computing, communication and networking systems • Quantum error correction • Relations with classical error correction • Quantum Low-Density Parity Check codes & decoders • Iterative decoders • Trapping sets analysis

Selected Journals

• Constant-overhead fault-tolerant quantum computation with reconfigurable atom arrays

  Nature Physics, 2024 — Demonstrates a scalable, constant-overhead approach to quantum computation using neutral atom arrays.
  (Q. Xu, J. P. Bonilla Ataides, C. A. Pattison, N. Raveendran, D. Bluvstein, J. Wurtz, B. Vasić, M. D. Lukin, L. Jiang, H. Zhou)

• Soft-syndrome iterative decoding of quantum LDPC codes and hardware architectures

  EPJ Quantum Technology 10:45, 2023 — Introduces soft-syndrome decoders and hardware architectures for quantum LDPC codes.
  (N. Raveendran, J. Valls, A. Pradhan, N. Rengaswamy, F. Garcia-Herrero, B. Vasić)

• Trapping Sets of Quantum LDPC Codes

  Quantum 5:562, 2021 — Foundational analysis on trapping sets in quantum LDPC codes to improve iterative decoding.
  (N. Raveendran, B. Vasić)

• Finite-rate QLDPC-GKP coding scheme that surpasses the CSS Hamming bound

  Quantum 6:767, 2022 — Introduces hybrid QLDPC-GKP codes that outperform traditional CSS bounds.
  (N. Raveendran, N. Rengaswamy, F. Rozpędek, A. Raina, L. Jiang, B. Vasić)

• Entanglement purification with quantum LDPC codes and iterative decoding

  Quantum 8:1233, 2024 — Presents entanglement purification using quantum LDPC codes and iterative decoders.
  (N. Rengaswamy, N. Raveendran, A. Raina, B. Vasić)

• A Sub-Graph Expansion-Contraction Method for Error Floor Computation

  IEEE Transactions on Communications 68(7):3894-3995, 2020 — Proposes a method for estimating LDPC code error floors via sub-graph expansion.
  (N. Raveendran, D. Declercq, B. Vasić)

Selected Conferences

• Non-Binary Hypergraph-Product Codes for Qudit Error Correction

  IEEE QCE 2024 — Best Paper Award. Explores non-binary hypergraph-product codes for efficient qudit error correction.
  (S. K. Borah, A. K. Pradhan, N. Raveendran, N. Rengaswamy, B. Vasić)

• Learning to decode trapping sets in QLDPC codes

  ISTC 2023 — Demonstrates a neural network-based decoder for identifying trapping sets in QLDPC codes.
  (A. K. Pradhan, N. Raveendran, N. Rengaswamy, X. Xiao, B. Vasić)

• Quaternary-binary message-passing decoder for quantum LDPC codes

  IEEE Globecom 2023 — Introduces a message-passing decoder improving LDPC decoding convergence and accuracy.
  (D. Chytas, N. Raveendran, A. Pradhan, B. Vasić)

• Turbo-XZ Algorithm: Low-Latency Decoders for Quantum LDPC Codes

  ISTC 2023 — Proposes a low-latency flipping decoder in a turbo approach to enhance LDPC decoding performance.
  (N. Raveendran, E. Boutillon, B. Vasić)

Preprints & In-press

• Fault Tolerant Decoding of QLDPC-GKP Codes with Circuit Level Soft Information

  IEEE QCE 2025 — explores improving QEC by using soft, real-time information from inner GKP codes to enhance the performance of outer QLDPC codes under realistic, circuit-level noise.
  (S. K. Borah, A. K. Pradhan, N. Raveendran, M. Pacenti, B. Vasić)

• Collective bit-flipping-based decoding of quantum LDPC codes

  IEEE Transactions on Communications (in press) — A collective bit-flipping decoding framework for improved LDPC performance.
  (D. Chytas, N. R., B. Vasić)

Full list and BibTeX on Google Scholar.

• WKS18 - Quantum Error Correction: Pathways to Scalability

  Organizer and Chair, IEEE Quantum Week (QCE) 2025 — Workshop on scalable QLDPC and reconfigurable fault-tolerant architectures.

• Fault-Tolerant Decoding of QLDPC-GKP Codes with Circuit-Level Soft Information

  Contributed talk, IEEE Quantum Week (QCE) 2025 — Discussed circuit-level soft decoding for QLDPC–GKP codes.

• On the Minimum Distance of Lifted Product LDPC Codes

  Invited workshop talk, ITA 2025 (San Diego, CA) — Analysis of LDPC minimum distances for scalable classical/quantum codes.

• Low-complexity and low-latency decoding of quantum LDPC codes

  Invited talk, ITA 2025 — Presented lightweight architectures for fast LDPC decoding.

• Quantum Trapping Sets and Their Impact on QLDPC Decoding

  Invited + panel session, QUIK Workshop, Athens, 2024 — Discussion on trapping sets and decoding behavior in QLDPC codes.

• Concatenated QLDPC Codes and Decoders

  Invited workshop talk, ITA 2024 (San Diego, CA) — Introduced hybrid concatenated QLDPC frameworks for efficient decoding.

• Digital Communication I

  Undergraduate / Graduate-level course introducing the principles of digital communication, including signal space concepts, modulation techniques, and performance over noisy channels.

• Digital Communication II

  Continuation of Digital Communication I focusing on error control coding, information theory foundations, and modern iterative decoding algorithms applied to classical and quantum systems.

• Quantum Error Correction and Fault-Tolerant Computing

  Graduate seminar exploring stabilizer formalism, LDPC and surface codes, and fault-tolerant quantum architectures. Integrates current research directions in quantum communication and hardware-aware decoding.

Email at nithin@arizona.edu or connect on LinkedIn.

Also on GitHub • Google Scholar