Abstract:
Quantum Chromo Dynamics (QCD) is the fundamental theory of strong interactions, i.e. of the interactions of gluons and quarks. QCD is time reversal invariant, and, therefore, QCD processes cannot produce thermal entropy. However, a thermal, so called "fireball", description of high-energy heavy ion collisions with large thermal entropy is applicable. This apparent contradiction is explained by Quantum Information Science, namely by the Eigenstate Thermalization Hypothesis (ETH). For small systems, certain aspects of quantum computing can be evaluated on classical, digital computers by explicit Hilbert space construction. This we did and we confirmed the validity of ETH for SU(2) gauge theory. Encouraged by this success we have continued to analyze other aspects. Roughly speaking, all of these agree with theoretical expectations (up to finite volume and truncation artefacts). This additional success has ecouraged us to start work on an even far more ambitious project, namely the first principle QCD (or more precisely AdS/CFT) treatment of hadronization.