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Physical scenarios where the electromagnetic fields are so strong thatQuantum ElectroDynamics (QED) plays a substantial role are one of the frontiersof contemporary plasma physics research. Investigating those scenarios requiresstate-of-the-art Particle-In-Cell (PIC) codes able to run on tophigh-performance computing machines and, at the same time, able to simulatestrong-field QED processes. This work presents the PICSAR-QED library, anopen-source, portable implementation of a Monte Carlo module designed toprovide modern PIC codes with the capability to simulate such processes, andoptimized for high-performance computing. Detailed tests and benchmarks arecarried out to validate the physical models in PICSAR-QED, to study hownumerical parameters affect such models, and to demonstrate its capability torun on different architectures (CPUs and GPUs). Its integration with WarpX, astate-of-the-art PIC code designed to deliver scalable performance on upcomingexascale supercomputers, is also discussed and validated against results fromthe existing literature.

PICSAR-QED: a Monte Carlo module to simulate Strong-Field Quantum Electrodynamics in Particle-In-Cell codes for exascale architectures