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David Deutsch, a physicist and pioneer in the field of quantum computing, is a proponent of the Many-Worlds Interpretation (MWI) of quantum mechanics. He argues that if a quantum computer capable of solving problems beyond the reach of classical computers is built, it would provide strong evidence in favor of MWI.
Deutsch's argument stems from the fact that quantum computers exploit the principles of superposition and entanglement, which are central to MWI. According to MWI, when a quantum system undergoes superposition or entanglement, the universe splits into multiple branches, with each branch representing a different outcome or possibility.
Deutsch suggests that if a quantum computer can efficiently solve problems that are computationally infeasible for classical computers, it would indicate that these parallel branches of computation, encompassing all possible outcomes, are physically real. In other words, the computational power of a quantum computer would support the notion that multiple parallel universes exist.
However, it's important to note that MWI is just one interpretation among several competing interpretations of quantum mechanics. Other interpretations, such as the Copenhagen interpretation or the Pilot-Wave theory, have their own proponents and explanations for the behavior of quantum systems.
While Deutsch's argument highlights the potential connection between quantum computing and MWI, it does not provide definitive proof of MWI or rule out other interpretations. The interpretation of quantum mechanics remains a subject of active debate and philosophical inquiry within the scientific community.