A computer-implemented system and method for determining collapse states in quantum and probabilistic systems using wave-interference-based computation are disclosed. The system models collapse as a deterministic process arising from interaction between a system wavefunction and one or more observer or environmental wavefunctions. A modified Schrödinger-type formulation is used to compute a real-valued collapse intensity based on amplitude coupling and phase alignment between interacting wavefunctions. The system further aggregates the collapse intensity over a spatial domain to generate a scalar collapse measure, which is compared against a predefined threshold to determine collapse conditions. The invention enables simulation, prediction, and control of collapse behavior across quantum systems, probabilistic computation, and collapse-driven decision architectures.