Why do quantum systems remember their past? ⚡ экспресс
The PXP model describes atom chains where a ban on neighbor excitation drives most states to thermal equilibrium, yet quirky 'quantum scars' sidestep it. We explored how local memory persists using fidelity and local observables. Turns out, θ-symmetric and blockaded states clutch onto local memory tightly: fidelity hugs 100%, and fluctuations dwindle as the system grows. This unveils non-ergodic regimes holding local memory even amid global complexity—like islands of stability in a chaotic ocean.
Usually any disturbance in the quantum world disperses like ripples on water. But in systems with the rule 'no two can be excited next to each other,' special patterns emerge — quantum scars. They don't fade, like waves frozen in time.
Scientists studied two types of initial configurations of these scars and found that even tiny parts of the system almost perfectly replicate the original state. As the system grows, random deviations only diminish. Like a photograph frozen into a dynamic movie, local memory resists chaos.
This changes our understanding of entropy and disorder and paves the way to ultra-stable quantum computers. Experiments with spectroscopy already confirm such ideas, bringing us closer to controlling quantum memory.
🎯 Atoms in such experiments are comparable in size to bacteria — up to thousandths of a millimeter.
🎬 In Peter Watts' sci-fi novel 'Blindsight,' an alien ship uses quantum states to preserve consciousness — perhaps quantum scars could form the basis of such technology.