Time crystals without chaos ⚡ экспресс
Discrete time crystals (DTCs) are nonequilibrium phases in periodically driven systems that spontaneously break discrete time-translation symmetry. Stabilization of most DTC phases relies on disorder-induced many-body localization. An experimental scheme is proposed to realize a disorder-free DTC in an array of periodically pumped Rydberg atoms. The scheme uses a linear potential in the atomic detuning (Stark potential) to enhance temporal order without depending on (Stark) many-body localization. It is numerically demonstrated that the Stark potential boosts the DTC's robustness against flip errors and extends its lifetime, with the outcome independent of initial states. Thus, the proposed approach opens a promising avenue for investigating DTCs in Rydberg lattices without requiring disorder averaging or special state preparation.
Time crystals pulse in time, like a perpetual metronome that never needs winding. The idea was proposed by Frank Wilczek almost ten years ago. Previously, to keep such a metronome from losing its beat, disorder was deliberately introduced into the system — a paradox, but chaos helped the rhythm. Now a chaos-free path has been found: scientists used Rydberg atoms, named after Johannes Rydberg. In such atoms, the electron is far from the nucleus — if the nucleus is the size of a pea, the electron is a football field away. Using spectroscopy (the control of light and fields) instead of disorder, they created a smoothly increasing electric field along the chain. Like a perfectly smooth track, it keeps the rhythm even with errors. The result: the metronome ticks longer and more stably, regardless of initial conditions. The crystal is easier to produce, and it paves the way to ultra-precise clocks and quantum memory.
🎯 Frank Wilczek, who won the Nobel Prize for a different discovery, initially faced skepticism: his idea of time crystals was ridiculed. Today, they are being created in dozens of laboratories.
🎬 In science fiction, time crystals are a source of eternal energy or a portal to the past. Now this idea is taking on real shape.