2021-12-02

Stanford physicists created the time crystal with the help of Google quantum computer

By yqqlm yqqlm

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e1544276bb15d93 - Stanford physicists created the time crystal with the help of Google quantum computer

it is reported that regular crystals are characterized by highly ordered atomic structures. But scientists have proposed a hypothesis. If these atoms can repeat in the spatial dimension, will there be a crystal that will repeat over time

as early as 2012, Nobel laureate Frank Wilczek assumed that the so-called time crystal might exist. But it was not until 2016 that the research team proved it in the laboratory

the follow-up study focused more on the crystal growth and the interaction between them. It can be seen that in the time crystal, atoms move in a periodic and repeated mode, and we can predict the up and down flip according to their spin

strangely, this rhythm does not follow the starting frequency. In a perfect system, the atom can always maintain its rhythm without any further input

Stanford physicists created the time crystal with the help of Google quantum computer

the time crystal can flip back and forth between the two states without consuming energy

if we take the affairs in daily life as an example, we can regard the time crystal as a strange gelatin bowl. After you move it, expect it to stop after shaking for a few seconds, and then you can move it again

however, the unique feature of the time crystal is that you only need to move it twice, and it will continue to change alternately between shaking and non shaking. Although it sounds like a paradox close to the “perpetual motion machine”, the time crystal does not technically violate the laws of thermodynamics

the Harvard research team pointed out that energy is still conserved in the whole system – except that entropy (a measure of disorder) does not decrease, but remains unchanged. Taking Google’s sycamore quantum processor as an example, to start the time crystal, the research team used a laser to destroy the lattice of 20 qubits. Then every two laser pulses, the qubit spins only once – breaking the symmetry of time translation and creating a time crystal. More importantly, this is the first time that crystals show’many body localization’, which keeps them stable

during this special experiment, scientists only observed the system for hundreds of cycles. But they say that in theory, the long-term stability of time crystals can be verified by the simulation run by the quantum computer itself

Stanford physicists created the time crystal with the help of Google quantum computer(1)

screenshot (from: nature)

we try to use the versatility of quantum computer to help us analyze its own limitations. It can basically tell us how to correct our mistakes, so as to determine the time crystallization mode under the ideal condition through limited time observation

related articles: physicists have observed the interaction of time crystals for the first time. According to the research, Google quantum computer has just been used to create so-called time crystals. The strange “time crystals” created in quantum computers may change physics forever