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The universe of problems that a computer can check has grown. The researchers’ secret ingredient? Quantum entanglement.
A two-player game can reveal whether the universe has an infinite amount of complexity.
The same codes needed to thwart errors in quantum computers may also give the fabric of space-time its intrinsic robustness.
Recent experiments have put relatively large objects into quantum states, illuminating the processes by which the ordinary world emerges out of the quantum one.