Bizarre Quantum Universe | Scientific American– www.scientificamerican.com

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Excerpt:

In 2022 three scientists won the Nobel Prize in Physics for proving something astonishing: the universe is not locally real. In other words, particles don’t have fixed properties until they are measured. Although it seems to counter everything we perceive, the discovery was established by some of the most rigorous experiments ever conducted, and it aligns with a prediction Albert Einstein and his colleagues made almost 100 years ago: that particles strangely influence one another, even across vast distances. Today quantum strangeness is no longer confined to theory. Researchers are entangling objects large enough to see, quantum computers are on the cusp of solving problems no classical machine can touch, and speculative ideas such as vacuum decay and alternative realities are serious science. The quantum era has arrived.

Bizarre quantum dynamics underpin our view of reality: Time travels forward for us, but in the quantum world, it may flow in two directions. Gravity itself may follow quantum rules. Quantum mechanics supports the possibility of alternative universes, but even if they exist, we can’t access them (and probably shouldn’t anyway). Some physicists argue that quantum rules dictate that everything in the universe is preordained, making free will an illusion, so we might as well accept our current reality.