Nonstationary coherent quantum manybody dynamics through dissipation
Abstract
The assumption that quantum systems relax to a stationary state in the longtime limit underpins statistical physics and much of our intuitive understanding of scientific phenomena. For isolated systems this follows from the eigenstate thermalization hypothesis. When an environment is present the expectation is that all of phase space is explored, eventually leading to stationarity. Notable exceptions are decoherencefree subspaces that have important implications for quantum technologies and have so far only been studied for systems with a few degrees of freedom. Here we identify simple and generic conditions for dissipation to prevent a quantum manybody system from ever reaching a stationary state. We go beyond dissipative quantum state engineering approaches towards controllable longtime nonstationarity typically associated with macroscopic complex systems. This coherent and oscillatory evolution constitutes a dissipative version of a quantum time crystal. We discuss the possibility of engineering such complex dynamics with fermionic ultracold atoms in optical lattices.
 Publication:

Nature Communications
 Pub Date:
 April 2019
 DOI:
 10.1038/s4146701909757y
 arXiv:
 arXiv:1804.06744
 Bibcode:
 2019NatCo..10.1730B
 Keywords:

 Quantum Physics;
 Condensed Matter  Quantum Gases;
 Condensed Matter  Statistical Mechanics;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 Main text in MS Word (10 pages, 4 figures) and Supplementary material in TeX (10 pages, 2 figures). Main text PDF embedded in TeX. Version as accepted by Nature Communications