Amirreza Negari

My work combines analytic ideas with numerical tools to understand the physics of information and matter, from error correction and quantum memories to entanglement theory, decodability, and learnability.

I am a postdoctoral fellow at the Institute for Quantum Computing (IQC)

Research

Mixed-state phases and quantum memories Mixed-state phases and quantum memories I use Markov length and conditional mutual information to study noisy quantum memories and mixed-state phases, from diagnostics for fault tolerance to the rapid growth of long-range conditional correlations under local dissipation. Entanglement and quantum information Entanglement and quantum information I study how symmetry and fermion parity shape entanglement and communication, including nonadditivity of entanglement of purification and the advantages of collective preparation and encoding in fermionic systems. Learnability and decodability Learnability and decodability Some phases are distinguished by whether their information can be learned, decoded, or recovered efficiently from accessible data. Fermionic systems and many-body methods Fermionic systems and many-body methods I develop controlled approximations and recovery results for fermionic Gaussian states, alongside quantum Monte Carlo methods for fermionic criticality and the sign problem. Covariance matrices connect the structure of these states to practical many-body calculations.

Academic Path

I started physics through the Physics Olympiad in high school, continued at Sharif University of Technology, came to Perimeter through the PSI master’s program, completed my PhD there, and then joined the Quantum Interactions Theory Group at IQC as a postdoc.

Methods

My work combines analytic ideas with numerical tools to understand the physics of information and matter. I use tensor networks, quantum Monte Carlo, stabilizer, Clifford, and Gaussian formalisms, along with other ways of classically simulating hard quantum problems.

Teaching & Community

Teaching has been a central part of my physics path, from Olympiad instruction to mentoring students at Perimeter. I enjoy helping students find the simple idea behind a difficult problem, and building communities where that kind of thinking can happen naturally.

Papers

01 Preprint · 2026

Instability of Markov chains under infinitesimal coherent dissipation

With Yijian Zou and Timothy H. Hsieh.

arXiv

02 Preprint · 2026

Nonadditivity in fermionic quantum Shannon theory

With Farzin Salek, Graeme Smith, Jens Eisert, and Debbie Leung.

arXiv

03 Preprint · 2026

Entanglement of purification for Werner states: canonical purification and nonadditivity

With Zahra Baghali Khanian.

arXiv

04 Preprint · 2026

Approximation theorems for fermionic Gaussian states

With Farzin Salek, Zoltán Zimborás, Aram Harrow, Patrick Hayden, and Jens Eisert.

arXiv

View all papers →

Contact

I’d always be happy to receive physics problems, questions, or half-formed thoughts by email. I also enjoy hearing about AI, history, languages, politics, or watching an interesting video about cuneiform. I sometimes keep related thoughts in notes.

anegari@uwaterloo.ca