Bosonic quantum field simulation

Quantum field simulators offer unique opportunities to investigate otherwise inaccessible phenomena through tabletop experiments. Taming the complexity of such inherently high-dimensional models requires efficient encodings paired with experimentally friendly readout methods.  

First, we introduce the Optical Time Algorithm (OTA) as a unifying framework that enables the simulation of a wide range of free quantum field dynamics using a single optical circuit design [1]. By modifying the optical elements' parameters, our method allows us to engineer essentially arbitrary spacetime metrics, coupling graphs, timescales, and boundary conditions.  

Second, we put forward the classical entropy method as a universal data-driven toolkit for directly probing quantum information from typical measurement data [2]. We show that well-known features of quantum information measures such as the area law carry over to suitably chosen classical measures. As applications, we demonstrate the area-to-volume law transition in the quench dynamics of a spin-1 Bose-Einstein condensate [3,4] and report the first experimental observation of an area law in an interacting quantum field simulator [5].