quantum physics

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    Is Quantum Theory About Reality or What We Know?

    Does the quantum state ultimately represent some objective aspect of reality, or is it a way of characterizing something about us, namely, something about what some person knows about reality?Photograph by Ben Scholzen / Flickr Physicists know how to use quantum theory—your phone and computer give plenty of evidence of that. But knowing how to […]

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    How Big Can Schrödinger’s Kittens Get?

    Scientists are slowly scaling up quantum effects from atomic to human size.

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    The Quantum Mechanics of Fate

    How time travel might explain some of science’s biggest puzzles.

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    The Rise of the Uncertain

    Uncertainty in physics has gone from black sheep to overachiever.