A1 Refereed original research article in a scientific journal
Measured Composite Collision Models: Quantum Trajectory Purities and Channel Divisibility
Authors: Beyer Konstantin, Luoma Kimmo, Lenz Tim, Strunz Walter T.
Publisher: MDPI
Publication year: 2022
Journal: Entropy
Journal name in source: ENTROPY
Journal acronym: ENTROPY-SWITZ
Article number: 715
Volume: 24
Number of pages: 13
eISSN: 1099-4300
DOI: https://doi.org/10.3390/e24050715
Web address : https://www.mdpi.com/1099-4300/24/5/715
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/175864854
We investigate a composite quantum collision model with measurements on the memory part, which effectively probe the system. The framework allows us to adjust the measurement strength, thereby tuning the dynamical map of the system. For a two-qubit setup with a symmetric and informationally complete measurement on the memory, we study the divisibility of the resulting dynamics in dependence of the measurement strength. The measurements give rise to quantum trajectories of the system and we show that the average asymptotic purity depends on the specific form of the measurement. With the help of numerical simulations, we demonstrate that the different performance of the measurements is generic and holds for almost all interaction gates between the system and the memory in the composite collision model. The discrete model is then extended to a time-continuous limit.
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