QC Research Seminar: Preparing spin-squeezed states in Rydberg atom arrays via quantum optimal control

Speaker: ​Edison Carrera (CEA).

Abstract: 
Rydberg-atom arrays provide a programmable platform for engineering long-range interacting spin systems and generating metrologically useful entangled states. In this talk, I will present a quantum optimal-control approach for preparing spin-squeezed states in ring arrays with van der Waals Ising interactions. Starting from an initially unentangled state, gradient-based optimization is used to design tailored pulse sequences that drive the system toward strongly correlated states with a prescribed squeezing direction. Compared with the uncontrolled dynamics, the optimized protocols yield substantially enhanced spin squeezing and remain robust as the system size increases.
A notable feature is that control pulses optimized on small arrays can be transferred to significantly larger systems without re-optimization, suggesting a scalable route to entangled-state preparation in programmable Rydberg platforms. I will conclude with a brief outlook on related questions of controllability and state-preparation complexity in neutral-atom systems.