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March 3, 2022 07:00 am

Physicists Produce Biggest Time Crystal Yet

sciencehabit shares a report from Science.org: Physicists in Australia have programmed a quantum computer half a world away to make, or at least simulate, a record-size time crystal -- a system of quantum particles that locks into a perpetual cycle in time, somewhat akin to the repeating spatial pattern of atoms in an actual crystal. The new time crystal comprises 57 quantum particles, more than twice the size of a 20-particle time crystal simulated last year by scientists at Google. That's so big that no conventional computer could simulate it, says Chetan Nayak, a condensed matter physicist at Microsoft, who was not involved in the work. "So that's definitely an important advance." The work shows the power of quantum computers to simulate complex systems that may otherwise exist only in physicists' theories. [Philipp Frey and Stephan Rachel, theorists at the University of Melbourne] performed the simulation remotely, using quantum computers built and run by IBM in the United States. The qubits, which can be set to 0, 1, or 1 and 0 at once, can be programmed to interact like magnets. For certain settings of their interactions, the researchers found, any initial setting of the 57 qubits, such as 01101101110 ..., remains stable, returning to its original state every two pulses, the researchers report today in Science Advances. [...] Whereas more than 100 researchers worked on the Google simulation, Frey and Rachel worked alone to perform their larger demonstration, submitting it to the IBM computers over the internet. "It was just me, my graduate student, and a laptop," Rachel says, adding that "Philipp is brilliant!" The entire project took about 6 months, he estimates. The demonstration isn't perfect, Rachel says. The flipping pattern ought to last indefinitely, he says, but the qubits in IBM's machines can only hold their states long enough to simulate about 50 cycles. Ultimately, the stabilizing effect of the interactions might be used to store the state of a string of qubits in a kind of memory for a quantum computer, he notes, but realizing such an advance will take -- what else? -- time.

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