Tag

Thermalization

All articles tagged with #thermalization

science26 days ago•9 min saved

Quantum Birthmarks Endure: Initial-State Memories Survive Chaotic Evolution

Physicists show that chaotic quantum systems retain a memory of their starting conditions: the time-averaged probability to return to the initial state is enhanced by at least a factor of 2 over unrelated states (the quantum birthmark), and this nonergodic signature persists in the infinite-time limit absent decoherence. The effect stems from quantum interference among energy eigenstates and can be amplified by classical periodic orbits (scars), linking quantum chaos to ergodicity-breaking and offering a new angle on quantum thermalization. The stadium billiard serves as a testbed, with potential experimental tests in quantum simulators; the work deepens the bridge between quantum and classical descriptions of chaos.

via American Physical Society|

#ergodicity #quantum-birthmark #quantum-chaos

science2 years ago•9 min saved

"Unraveling Eternal Stability: The Quantum Trick's Downfall"

Physicists have been debating the stability of a quantum phenomenon known as many-body localization (MBL) in one-dimensional chains. Recent research has challenged the long-held belief in the eternal stability of MBL, with the discovery of a new thermalization-causing phenomenon called avalanches. These findings have led to a reevaluation of the MBL phase diagram, suggesting that MBL may not be as stable as previously thought. The debate revolves around a mathematical proof of MBL's existence, with researchers working to either contradict or verify it. While the stability of MBL remains uncertain, physicists are excited about the opportunity to discover new phenomena in quantum systems.

via Quanta Magazine|

#avalanche #many-body-localization #mathematical-proof

physics2 years ago•3 min saved

Insights into Charm and Beauty Particles in Quark-Gluon Plasma Revealed by ALICE Measurements

The ALICE collaboration at CERN has conducted new measurements on the dynamics of charm and beauty particles in quark-gluon plasma. By analyzing non-head-on lead-lead collisions, they compared the elliptic flow of prompt D mesons (produced right after the collisions) with that of non-prompt D mesons (produced later in the decays of B mesons). The results show that the elliptic flow of non-prompt D mesons is weaker than that of prompt D mesons, confirming expectations and shedding light on the thermalization of beauty quarks. These findings pave the way for further measurements in the future.

via Phys.org|

#alice #elliptic-flow #heavy-quarks