TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysCore.8.1.014
TI  - Kinetics of quantum reaction-diffusion systems
PY  - 2025/02/04
UR  - https://www.scipost.org/SciPostPhysCore.8.1.014
JF  - SciPost Physics Core
JA  - SciPost Phys. Core
VL  - 8
IS  - 1
SP  - 014
A1  - Gerbino, Federico
AU  - Lesanovsky, Igor
AU  - Perfetto, Gabriele
AB  - We discuss many-body fermionic and bosonic systems subject to dissipative particle losses in arbitrary spatial dimensions $d$, within the Keldysh path-integral formulation of the quantum master equation. This open quantum dynamics represents a generalisation of classical reaction-diffusion dynamics to the quantum realm. We first show how initial conditions can be introduced in the Keldysh path integral via boundary terms. We then study binary annihilation reactions $A+A\to \emptyset$, for which we derive a Boltzmann-like kinetic equation. The ensuing algebraic decay in time for the particle density depends on the particle statistics. In order to model possible experimental implementations with cold atoms, for fermions in $d=1$ we further discuss inhomogeneous cases involving the presence of a trapping potential. In this context, we quantify the irreversibility of the dynamics studying the time evolution of the system entropy for different quenches of the trapping potential. We find that the system entropy features algebraic decay for confining quenches, while it saturates in deconfined scenarios.
ER  -

@Article{10.21468/SciPostPhysCore.8.1.014,
	title={{Kinetics of quantum reaction-diffusion systems}},
	author={Federico Gerbino and Igor Lesanovsky and Gabriele Perfetto},
	journal={SciPost Phys. Core},
	volume={8},
	pages={014},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhysCore.8.1.014},
	url={https://scipost.org/10.21468/SciPostPhysCore.8.1.014},
}