Atomic Dance Against Chaos ⚡ экспресс
For the first time, scientists have studied the breaking of PT symmetry (the balance of loss and gain) in a quantum many-body system. In an array of Rydberg atoms, they realized a non-Hermitian XY model and detected a phase transition through the Loschmidt echo (a measure of reversibility). Dipolar interactions set the boundary of the transition and caused a quantum blockade effect that shields the system from decay. The strength of this protection varied with system size in a non-monotonic way: as if the bigger the team, the more surprisingly stable it becomes.
In the world of atoms, any external influence can turn a neat order into chaos. Usually, energy losses only increase entropy — a measure of disorder. But physicists discovered the opposite: sometimes losses help the system maintain stability.
It resembles a complex dance, where partners are so tightly connected that a random deviation of one is immediately compensated by the rest. The effect only appears when atoms interact strongly with each other — as in the experiment with giant Rydberg atoms (the size of a bacterium), whose unusual states for hydrogen were first described by Johannes Rydberg. Using laser probing, scientists observed the 'blockade effect': if one atom tried to change its state, the neighbors forbade it. As a result, the collective pattern persisted many times longer than expected.
Such 'mutual aid' will open the way to quantum computers resistant to interference — because fragile quantum information will be protected by the very structure of the system.
🎯 Due to the blockade effect, atoms cannot 'make a mistake' individually — any change requires the consent of the entire collective, like in a dance where all partners are linked.
🎬 This is reminiscent of a fantastic 'quantum armor': information about the initial state is preserved even under the attacks of chaos, because the system itself prevents it from being destroyed.