charge due to some missing electrons?—?in electric fields to form a ring, sort of like a bagel. Because these ions, being identically charged,
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, repulse each other,
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, they’d assume positions at equal distances around the ring, just like the regularly spaced atoms of an ordinary crystal. A nearby magnetic field would induce the ring to rotate. One of the ions in the ring could be flagged in a detectable way (think of a raisin embedded in the bagel) allowing scientists to detect the repeating periodic motion,
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, demonstrating time crystal status. Since it’s in its “ground state,” meaning it requires no input of energy to sustain itself,
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, the rotating atom-bagel would constitute a clock that ticked forever.

Don’t worry, it’s not a perpetual motion machine. The ground state is the condition of lowest possible energy. You can’t get any energy out of this rotating bagel and it can do no work,
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, so the laws of thermodynamics remain unbroken.

It’s a cool idea?—?literally,
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, as the spacetime crystal relies on quantum processes that work at temperatures of nanokelvins. (That’s like a billionth of the temperature found in the depths of outer space.)

“In order to experimentally realize such a space-time crystal with trapped ions, we need to confine ions tightly to have a small diameter, and cool the ions to a very low temperature,
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,” Tongcang Li and colleagues write in their paper.

Ion traps?—?devices using an electrical field to confine the ions in a small space — are already widely used for a variety of experimental purposes,
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. And achieving the necessary

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