Debbie Leung

I study the capacity of communicating various form of data (quantum, private, or classical) through quantum channels, focusing on the superadditivity phenomenon. I also study how quantum entanglement, in particular, embezzlement of entanglement, plays a role in quantum information theory.
  • Tolman Postdoctoral Fellow in Theoretical Physics Institute for Quantum Information, Caltech December 2002 - August 2005
  • Postdoctoral Fellow in Workshop on Quantum Computation Mathematical Sciences Research Institute, Berkeley September 2002 - December 2002
  • Postdoctoral Fellow Physics of Information group IBM T.J. Watson Research Center July 2000 - August 2002
  • University Research Chair, University of Waterloo, 2015 - to date
  • Tier II Canada Research Chair in Quantum Communications, 2005-2015
  • On the mixed-unitary rank of quantum channels, M. Girard, D. Leung, J. Levick, C. Li, V. Paulsen, Y. Poon, and J. Watrous, Commun. Math. Phys. 394, 919-951 (2022). arXiv: 2003.14405. published 02 June 2022 Issue Date Septe
  • Incompressibility of classical distributions, A. Anshu, D. Leung, and D. Touchette, IEEE Trans. Inf. Theory, 68, 1758-1771, 2022. arXiv: 1911.09126. Published: 23 November 2021
  • Fault-tolerant quantum error correction using error weight parities, T. Tansuwannont and D. Leung, Phys. Rev. A, 104, 042410 (2021). arXiv: 2006.03068. Published 7 October 2021
  • Capacity Approaching Coding for Low Noise Interactive Quantum Communication, Part I: Large Alphabets, D. Leung, A. Nayak, A. Shayeghi, D. Touchette, P. Yao, and N. Yu, IEEE Trans. Inf. Theory, 67, 5443-5490 (2021), arXiv: 2001.02818. Published August 2021
  • Rate Reduction of Blind Quantum Data Compression With Local Approximations Based on Unstable Structure of Quantum States, K. Kuroiwa and D. Leung, arXiv: 2206.03501.
  • Generic nonadditivity of quantum capacity in simple channels, F. Leditzky, D. Leung, V. Siddhu, G. Smith, and J. Smolin, arXiv: 2202.08377 Accepted for oral presentation at BIID 2021, QIP 2022, ISIT 2022.
  • The platypus of the quantum channel zoo, F. Leditzky, D. Leung, V. Siddhu, G. Smith, and J. Smolin, arXiv: 2202.08387. Accepted for oral presentation at BIID 2021, QIP 2022, ISIT 2022.
  • Declined invitation to speak in person at summer workshop on QECC at IBM due to covid concern.
  • The platypus of the quantum channel zoo, Oberwolfach workshop 2140b - Geometry and Optimization in Quantum Information, Oberwolfach Research Institute for Mathematics, Germany (hybrid), Oct 3-9, 2021.
  • Quantum channel capacities, 1st International Symposium on Trans-Scale Quantum Science (TSQS2021), University of Tokyo, Japan (online), October 25-29, 2021.