QBism – Quanta Magazine

A New Theorem Maps Out the Limits of Quantum Physics

Anil Ananthaswamy — Thu, 03 Dec 2020 15:09:37 +0000

The founders of quantum mechanics understood it to be deeply, profoundly weird. Albert Einstein, for one, went to his grave convinced that the theory had to be just a steppingstone to a more complete description of nature, one that would do away with the disturbing quirks of the quantum. Then in 1964, John Stewart Bell proved a theorem that would test whether quantum theory was obscuring a full...

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New Quantum Paradox Clarifies Where Our Views of Reality Go Wrong

Anil Ananthaswamy — Mon, 03 Dec 2018 14:54:34 +0000

That quantum mechanics is a successful theory is not in dispute. It makes astonishingly accurate predictions about the nature of the world at microscopic scales. What has been in dispute for nearly a century is just what it’s telling us about what exists, what is real. There are myriad interpretations that offer their own take on the question, each requiring us to buy into certain as-yet...

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Quantum Theory Rebuilt From Simple Physical Principles

Philip Ball — Wed, 30 Aug 2017 07:00:18 +0000

Scientists have been using quantum theory for almost a century now, but embarrassingly they still don’t know what it means. An informal poll taken at a 2011 conference on Quantum Physics and the Nature of Reality showed that there’s still no consensus on what quantum theory says about reality — the participants remained deeply divided about how the theory should be interpreted.

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A Private View of Quantum Reality

Amanda Gefter — Thu, 04 Jun 2015 17:45:40 +0000

Christopher Fuchs describes physics as “a dynamic interplay between storytelling and equation writing. Neither one stands alone, not even at the end of the day.” And indeed Fuchs, a physicist at the University of Massachusetts, Boston, has a radical story to tell. The story is called QBism, and it goes something like this. Once upon a time there was a wave function, which was said to completely...

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