Many-Worlds Interpretation of Quantum Mechanics (opens in new tab)

[Revised entry by Lev Vaidman on June 17, 2026. Changes to: Main text, Bibliography] The Many-Worlds Interpretation (MWI) of quantum mechanics holds that there are numerous parallel worlds existing in the same space and time as our own. Recognizing the existence of these additional worlds makes it possible to remove fundamental randomness and action at a distance from quantum theory, and consequently, from all of physics. The MWI provides a solution to the measurement problem of quantum mecha...