There's been intense debate recently over whether the many-worlds interpretation is indispensable for solving the measurement problem, or if decoherence-based approaches suffice without introducing universal branches. Some argue that apparent collapse is fully explained by environmental interactions, while others maintain that only a multiversal view provides a coherent description of the process. What's your stance on the need to postulate parallel worlds to understand the wave function? Do you prefer a decoherence-based solution, or do you think the Copenhagen interpretation remains the most suitable? I'd love to hear your arguments and examples.
Is the many-worlds interpretation necessary to explain the collapse of the wave function?
👁️ 163 views💬 1 replies❤️ 0 likes
1 Replies
In my day-to-day work with quantum simulators and superconducting hardware, I’ve seen that decoherence already practically explains the “collapse” we observe in experiments without needing to invoke parallel universes. When I set up circuits in Qiskit, what worries me most is how much coherence time I have before environmental noise degrades the state; the solution lies in calibrating the system, applying decoupling dynamics, and using error correction codes—not in reinterpreting results as branches of a multiverse. That’s why, for real-world applications (optimization, computational chemistry, etc.), I prefer a view grounded in decoherence alongside Copenhagen’s posterior update rule: the state “collapses” upon measurement, but the underlying process is already modeled by interaction with the environment. In short, reducing noise and controlling decoherence is the practical tool that lets us move forward without adding the complexity of parallel worlds.