A randomized measurement protocol captures entanglement entropy in quantum processors without the need for complex gate controls.
Measuring the way quantum information spreads is normally a major engineering hurdle for analogue simulators. This protocol uses random measurements to observe the shift from quantum chaos to localization in neutral atom processors. It bypasses the requirement for universal control that makes other quantum computers so difficult to build. Researchers can now see the transition of entanglement across large systems with much simpler hardware. This breakthrough accelerates the timeline for using quantum simulators to solve problems in materials science and chemistry.
Randomised measurements of a disorder-induced entanglement transition in a neutral atom quantum processor
arXiv · 2604.24854
The development and spread of entanglement in complex quantum systems is central to exploring many-body phenomena out of equilibrium. Measuring entanglement dynamics can shed light on information scrambling and thermalisation, namely on transitions from many-body quantum chaos to localisation in disordered, interacting systems. In quantum computing systems, entanglement entropy and other nonlinear functions of the density matrix have been recently measured, in particular by using the randomised