Quantum many-body dynamics in two dimensions with artificial neural networks

The efficient numerical simulation of nonequilibrium real-time evolution in isolated quantum matter constitutes a key challenge for current computational methods. This holds in particular in the regime of two spatial dimensions, whose experimental exploration is currently pursued with strong efforts in quantum simulators. We present a versatile and efficient machine learning inspired approach based on a recently introduced artificial neural network encoding of quantum many-body wave functions. We identify and resolve some key challenges for the simulation of time evolution, which previously imposed significant limitations on the accurate description of large systems and long-time dynamics. As a concrete example, we study the dynamics of the paradigmatic two-dimensional transverse field Ising model, as recently also realized in systems of Rydberg atoms. Calculating the nonequilibrium real-time evolution across a broad range of parameters, we demonstrate that the reached time scales are comparable to or exceed the capabilities of state-of-the-art tensor network methods.

Talk based on: M. Schmitt and M. Heyl, Phys. Rev. Lett. 125, 100503 (2020)