many worlds – Quanta Magazine https://www.quantamagazine.org Illuminating science Mon, 16 Sep 2024 14:10:47 -0400 en-US hourly 1 https://wordpress.org/?v=6.2 Experiments Spell Doom for Decades-Old Explanation of Quantum Weirdness https://www.quantamagazine.org/physics-experiments-spell-doom-for-quantum-collapse-theory-20221020/ https://www.quantamagazine.org/physics-experiments-spell-doom-for-quantum-collapse-theory-20221020/#respond Thu, 20 Oct 2022 14:20:53 +0000 https://www.quantamagazine.org/?p=119930 The post Experiments Spell Doom for Decades-Old Explanation of Quantum Weirdness first appeared on Quanta Magazine

]]> How does objective reality emerge from the palette of possibilities supplied by quantum mechanics? That question — the deepest and most vexed issue posed by the theory — is still the subject of arguments a century old. Possible explanations for how observations of the world yield definite, “classical” results, drawing on different interpretations of what quantum mechanics means...

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]]> https://www.quantamagazine.org/physics-experiments-spell-doom-for-quantum-collapse-theory-20221020/feed/ 0 Where Quantum Probability Comes From https://www.quantamagazine.org/where-quantum-probability-comes-from-20190909/ https://www.quantamagazine.org/where-quantum-probability-comes-from-20190909/#respond Mon, 09 Sep 2019 15:00:44 +0000 https://www.quantamagazine.org/?p=75659 The post Where Quantum Probability Comes From first appeared on Quanta Magazine

]]> In A Philosophical Essay on Probabilities, published in 1814, Pierre-Simon Laplace introduced a notorious hypothetical creature: a “vast intelligence” that knew the complete physical state of the present universe. For such an entity, dubbed “Laplace’s demon” by subsequent commentators, there would be no mystery about what had happened in the past or what would happen at any time in the future.

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]]> https://www.quantamagazine.org/where-quantum-probability-comes-from-20190909/feed/ 0 Why the Many-Worlds Interpretation Has Many Problems https://www.quantamagazine.org/why-the-many-worlds-interpretation-has-many-problems-20181018/ https://www.quantamagazine.org/why-the-many-worlds-interpretation-has-many-problems-20181018/#respond Thu, 18 Oct 2018 14:27:11 +0000 https://www.quantamagazine.org/?p=64169 The post Why the Many-Worlds Interpretation Has Many Problems first appeared on Quanta Magazine

]]> It is the most extraordinary, alluring and thought-provoking of all the ways in which quantum mechanics has been interpreted. In its most familiar guise, the many-worlds interpretation (MWI) suggests that we live in a near-infinity of universes, all superimposed in the same physical space but mutually isolated and evolving independently. In many of these universes there exist replicas of you and...

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]]> https://www.quantamagazine.org/why-the-many-worlds-interpretation-has-many-problems-20181018/feed/ 0 Entanglement Made Simple https://www.quantamagazine.org/entanglement-made-simple-20160428/ https://www.quantamagazine.org/entanglement-made-simple-20160428/#comments Thu, 28 Apr 2016 17:00:42 +0000 https://www.quantamagazine.org/?p=23666 The post Entanglement Made Simple first appeared on Quanta Magazine

]]> An aura of glamorous mystery attaches to the concept of quantum entanglement, and also to the (somehow) related claim that quantum theory requires “many worlds.” Yet in the end those are, or should be, scientific ideas, with down-to-earth meanings and concrete implications. Here I’d like to explain the concepts of entanglement and many worlds as simply and clearly as I know how. I.

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