Browsing by Author "Cakmak, Baris"

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Citation - WoS: 5
Citation - Scopus: 6
Entropy Production in Non-Markovian Collision Models: Information Backflow Vs. System-Environment Correlations
(Mdpi, 2022) Senyasa, Huseyin T.; Kesgin, Sahinde; Karpat, Goktug; Cakmak, Baris
We investigate the irreversible entropy production of a qubit in contact with an environment modelled by a microscopic collision model in both Markovian and non-Markovian regimes. Our main goal is to contribute to the discussions on the relationship between non-Markovian dynamics and negative entropy production rates. We employ two different types of collision models that do or do not keep the correlations established between the system and the incoming environmental particle, while both of them pertain to their non-Markovian nature through information backflow from the environment to the system. We observe that as the former model, where the correlations between the system and environment are preserved, gives rise to negative entropy production rates in the transient dynamics, the latter one always maintains positive rates, even though the convergence to the steady-state value is slower as compared to the corresponding Markovian dynamics. Our results suggest that the mechanism underpinning the negative entropy production rates is not solely non-Markovianity through information backflow, but rather the contribution to it through established system-environment correlations.
Citation - WoS: 25
Citation - Scopus: 27
Synchronization and Non-Markovianity in Open Quantum Systems
(Amer Physical Soc, 2021) Karpat, Goktug; Yalcinkaya, Iskender; Cakmak, Baris; Luca Giorgi, Gian; Zambrini, Roberta
Y Detuned systems can spontaneously achieve a synchronous dynamics and display robust quantum correlations in different local and global dissipation regimes. Beyond the Markovian limit, information backflow from the environment becomes a crucial mechanism whose interplay with spontaneous synchronization is unknown. Considering a model of two coupled qubits, one of which interacts with a dissipative environment, we show that non-Markovianity is highly detrimental for the emergence of synchronization, for the latter can be delayed and hindered because of the presence of information backflow. The results are obtained considering both a master equation approach and a collision model based on repeated interactions, which represents a very versatile tool to tailor the desired kind of environment.