Quantum Optimal Control for Coherent Spin Dynamics of Radical Pairs via Pontryagin Maximum Principle
Ugur G. Abdulla, Jose H. Rodrigues, and Jean-Jacques Slotine
Quantum 10, 2096 (2026). https://doi.org/10.22331/q-2026-05-06-2096 This paper aims to devise the shape of the external electromagnetic field that drives the spin dynamics of radical pairs to a quantum coherent state through maximization of the triplet-born singlet yield in biochemical reactions. The model is a Schrödinger system with spin Hamiltonians given by the sum of Zeeman interaction and hyperfine coupling interaction terms. We introduce a one-parameter family of optimal control problems