Iterative construction of conserved quantities in dissipative nearly integrable systems

Abstract

Integrable systems offer rare examples of solvable many-body problems in the quantum world. Due to the fine-tuned structure, their realization in nature and experiment is never completely accurate, therefore effects of integrability are observed only transiently. One way to overcome this limitation is to weakly couple nearly integrable systems to baths and driving: these will stabilize integrable effects up to arbitrary time and encode them in the stationary state approximated by a generalized Gibbs ensemble. However, the description of such driven dissipative nearly integrable models is challenging and no exact analytical methods have been proposed so far. Here, we develop an iterative scheme in which integrability breaking perturbations (baths) determine the conserved quantities that play the leading role in a highly efficient truncated generalized Gibbs ensemble description. Our scheme paves the way for easier calculations in thermodynamically large systems and can be used to construct unknown conserved quantities.

10 pages, 5 figures (including Supplemental Material)

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Cited by in corpus (4)

• Quantum reaction-limited reaction-diffusion dynamics of noninteracting Bose gases
• Finding local integrals of motion in quantum lattice models in the thermodynamic limit
• Generalized Gibbs ensembles in weakly interacting dissipative systems and digital quantum computers
• Reaction-diffusion dynamics of the weakly dissipative Fermi gas