Fernengel, Bernd Michael (2023)
Stationary solutions of classical Markov chains and Lindblad equations.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00023979
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Stationary solutions of classical Markov chains and Lindblad equations | ||||
Language: | English | ||||
Referees: | Drossel, Prof. Dr. Barbara ; Giese, Prof. Dr. Enno | ||||
Date: | 2023 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | vii, 159 Seiten | ||||
Date of oral examination: | 26 April 2023 | ||||
DOI: | 10.26083/tuprints-00023979 | ||||
Abstract: | Master equations play a crucial role in natural science, as they describe the time evolution of a probability distribution in a system. While they are often referred to as being essential, computing a solution is often avoided and people refer to numerical methods or approximation techniques. In this thesis we present an analytical expression of the stationary solution of a master equation for a finite-size system, which is based on the structure of the associated state transition network and the notion of minimal absorbing sets. This formula is also applicable to discrete-time Markov chains. In the second part of this thesis we compute the stationary solution of the Lindblad equation by using the quantum jump unravelling. After interchanging the time average with the ensemble average, evaluating the time average of a single quantum trajectory is possible using the stationary solutions of classical discrete-time Markov chains and by replacing the classical states with time-averages quantum states. The ensemble average corresponds to the possible long-term behaviors, given by the minimal absorbing sets of a quantum state transition network. So far our method is restricted to the case that for every quantum trajectory the number of states directly after a quantum jump is finite. At the end of this thesis, we discuss possible generalizations, either to a countable infinite state space or to states that depend on a continuous parameter. Both cases require an analogue expression for stationary solutions of classical master equations on a countable infinite state space. |
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Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-239797 | ||||
Classification DDC: | 500 Science and mathematics > 530 Physics | ||||
Divisions: | 05 Department of Physics > Institute for Condensed Matter Physics > Theory of complex systems | ||||
Date Deposited: | 30 May 2023 12:24 | ||||
Last Modified: | 02 Jun 2023 12:36 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/23979 | ||||
PPN: | 508200636 | ||||
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