ACE: A general-purpose non-Markovian open quantum systems simulation toolkit based on process tensors

• URL: http://arxiv.org/abs/2405.19319v2
• Date: Tue, 30 Jul 2024 19:46:17 GMT
• Title: ACE: A general-purpose non-Markovian open quantum systems simulation toolkit based on process tensors
• Authors: Moritz Cygorek, Erik M. Gauger,
• Abstract summary: We describe a general-purpose computational toolkit for simulating open quantum systems. It provides numerically exact solutions for composites of zero-dimensional quantum systems strongly coupled to multiple, quite general non-Markovian environments.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We describe a general-purpose computational toolkit for simulating open quantum systems, which provides numerically exact solutions for composites of zero-dimensional quantum systems that may be strongly coupled to multiple, quite general non-Markovian environments. It is based on process tensor matrix product operators (PT-MPOs), which efficiently encapsulate environment influences. The code features implementations of several PT-MPO algorithms, in particular, Automated Compression of Environments (ACE) for general environments comprised of independent modes as well as schemes for generalized spin boson models. The latter includes a divide-and-conquer scheme for periodic PT-MPOs, which enable million time step simulations for realistic models. PT-MPOs can be precalculated and reused for efficiently probing different time-dependent system Hamiltonians. They can also be stacked together and combined to provide numerically complete solutions of small networks of open quantum systems. The code is written in C++ and is fully controllable by configuration files, for which we have developed a versatile and compact human-readable format.

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