Simultaneous Multiphoton-Multiatom Processes in Atomic Gases under Laser Fields

We investigate simultaneous multiphoton-multiatom processes in atomic gases exposed to laser fields under specific frequency conditions, where multiple atoms are simultaneously excited through the absorption of one laser photon each. These processes represent natural high-order quantum electrodynamics (QED) effects that occur independently of inter-atomic interactions. A characteristic length scale emerges, governing the physical range over which these phenomena manifest. We propose experiments to demonstrate the fundamental aspects of these collective QED processes.