Online (Email amgrad@uwaterloo.ca for link)
Candidate
Einar Gabbassov | University of Waterloo
Title
Reversing Decoherence with Quantum Reverse Diffusion
Abstract
The ensemble-averaged dynamics of open quantum systems are typically irreversible. We show that this irreversibility need not hold at the level of individually monitored quantum trajectories. Our main results are analytical quantum reverse stochastic differential equations with corresponding stochastic master equations that describe the exact and approximate reverse dynamics for continuously monitored Pauli channels, including time-dependent depolarizing noise. Our results bridge the gap between highly nonlinear classical reverse diffusion, prominent in generative modelling, and linear quantum mechanics. Consequently, our framework enables diffusion-driven quantum gates, single-state quantum tomography via forward–reverse cycles, and quantum error correction based on reverse diffusion.