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MM: Fachverband Metall- und Materialphysik

MM 34: Development of Calculation Methods

MM 34.6: Vortrag

Freitag, 21. März 2025, 11:45–12:00, H10

pyTTN, an open source toolbox for Quantum Dynamics simulations using Tree Tensor Network states — Lachlan Lindoy, •Daniel Rodrigo-Albert, Yannic Rath, and Ivan Rungger — National Physical Laboratory, Teddington, TW11 0LW, United Kingdom

The simulation of large-scale dissipative quantum systems is a significant challenge arising in several areas of physics and chemistry. In this talk we will discuss pyTTN, our recently developed software package for simulating dynamical properties of open quantum systems. This package makes use of Tree Tensor Network (or equivalently, Multi-Layer Multi-Configuration Time-Dependent Hartree) based representations of the state vector, and features both single- and multi-set ansätze, as well as adaptive bond dimension through subspace expansion techniques. The software has been designed with a focus on performance and ease of setup of new models and wavefunction topologies, including simple preparation of zero- and finite-temperature calculations with general bosonic, fermionic, and spin Hamiltonians. We will demonstrate the capabilities of the package with both unitary dynamics and non-unitary pseudomode-based approaches for the simulation of Anderson impurity models.

Keywords: open quantum systems; tensor networks; dissipative dynamics