der TechnokratSep 16, 2025
#StringBreaking: #Quantencomputer simulieren #StarkeKernkraft-Effekt - #Spektrum der #Wissenschaft https://www.spektrum.de/news/string-breaking-quantencomputer-simulieren-starke-kernkraft-effekt/2270014
Quantencomputer simulieren die Wunder der starken Kernkraft

Warum lassen sich Quarks nie einzeln beobachten? Zwei Teams zeigen nun, wie man mit Quantencomputern diesem wichtigen Physik-Rätsel nachgehen kann.

Spektrum.de
Markus HeylDec 30, 2023

Dynamical localization transition of string breaking in quantum spin chains

The fission of a string connecting two charges is an astounding phenomenon in confining gauge theories. The dynamics of this process has been studied intensively in recent years, yielding a dichotomy: the string can decay fast or persist up to extremely long times. In this PRL, we put forward a dynamical localization transition as the underlying mechanism:

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.230402

#quantum #localization #stringbreaking

Dynamical Localization Transition of String Breaking in Quantum Spin Chains

The fission of a string connecting two charges is an astounding phenomenon in confining gauge theories. The dynamics of this process have been studied intensively in recent years, with plenty of numerical results yielding a dichotomy: the confining string can decay relatively fast or persist up to extremely long times. Here, we put forward a dynamical localization transition as the mechanism underlying this dichotomy. To this end, we derive an effective string breaking description in the light-meson sector of a confined spin chain and show that the problem can be regarded as a dynamical localization transition in Fock space. Fast and suppressed string breaking dynamics are identified with delocalized and localized behavior, respectively. We then provide a further reduction of the dynamical string breaking problem onto a quantum impurity model, where the string is represented as an ``impurity'' immersed in a meson bath. It is shown that this model features a localization-delocalization transition, giving a general and simple physical basis to understand the qualitatively distinct string breaking regimes. These findings are directly relevant for a wider class of confining lattice models in any dimension and could be realized on present-day Rydberg quantum simulators.

Physical Review Letters