Making sense of quantum wavefunction collapse

Physics World reports on a breakthrough in understanding one of quantum mechanics' central puzzles: when you measure a quantum system, why does it suddenly collapse into a single state, rather than continuing to evolve smoothly? Researchers at Radboud University propose a new answer: treat measurement not as a sudden discontinuity, but as a continuous process driven by random quantum dynamics. In their model, the system gradually evolves toward a definite outcome under what they call stochastic Hamiltonians. The payoff is twofold: it resolves a long-standing conceptual tension in quantum theory, and it offers practical techniques for controlling quantum systems—crucial for quantum computing.

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