so happens that these people live in areas with monkeys and apes, which carry diseases that readily pass to humans."


It may sound like science fiction,
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, but it’s not: Scientists have created the first time crystal,
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, using a chain of ions. Just as a standard crystal repeats in a regular spatial pattern,
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, a time crystal repeats in time,
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, returning to a similar configuration at regular intervals.
“This is a remarkable experiment,
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,” says physicist Chetan Nayak of Microsoft Station Q at the University of California,
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, Santa Barbara. “There is a ‘wow factor.’”
Scientists at the University of Maryland and the University of California, Berkeley created a chain of 10 ytterbium ions. These ions behave like particles with spin, a sort of quantum mechanical version of angular momentum, which can point either up or down. Using a laser, the physicists flipped the spins in a chain of ions halfway around,
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, from up to down, and allowed the ions to interact so that the spin of each ion would influence the others. The researchers repeated this sequence at regular intervals,
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, flipping the ions halfway each time and letting them interact. When scientists measured the ions’ spins, on average the ions went full circle, returning to their original states, in twice the time interval at which they were flipped halfway.
This behavior is sensible — if each flip turns something halfway around, it takes two flips to return to its original position

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