Quantum nonequilibrium dynamics of Rydberg gases in the presence of dephasing noise of different strengths
Abstract
In the presence of strong dephasing noise the dynamics of Rydberg gases becomes effectively classical, due to the rapid decay of quantum superpositions between atomic levels. Recently a great deal of attention has been devoted to the stochastic dynamics that emerges in that limit, revealing several interesting features, including kinetically constrained glassy behaviour, selfsimilarity and aggregation effects. However, the nonequilibrium physics of these systems, in particular in the regime where coherent and dissipative processes contribute on equal footing, is yet far from being understood. To explore this we study the dynamics of a small onedimensional Rydberg lattice gas subject to dephasing noise by numerically integrating the quantum master equation. We interpolate between the coherent and the strongly dephased regime by defining a generalised concept of a blockade length. We find indications that the main features observed in the strongly dissipative limit persist when the dissipation is not strong enough to annihilate quantum coherences at the dynamically relevant time scales. These features include the existence of a timedependent Rydberg blockade radius, and a growth of the density of excitations which is compatible with the powerlaw behaviour expected in the classical limit.
 Publication:

Journal of Physics B Atomic Molecular Physics
 Pub Date:
 September 2016
 DOI:
 10.1088/09534075/49/18/184003
 arXiv:
 arXiv:1602.01314
 Bibcode:
 2016JPhB...49r4003L
 Keywords:

 Quantum Physics;
 Condensed Matter  Quantum Gases;
 Physics  Atomic Physics
 EPrint:
 15 pages, 6 figures