Karpat, Göktuğ
Loading...
Profile URL
Name Variants
Karpat, G
Karpat, Göktug
Karpat, Goktug
Karpat, G.
Karpat, Göktug
Karpat, Goktug
Karpat, G.
Job Title
Email Address
goktug.karpat@ieu.edu.tr
Main Affiliation
02.03. Physics
Status
Former Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
SDG data is not available
Documents
36
Citations
1290
h-index
18
Documents
36
Citations
1296
Scholarly Output
15
Articles
13
Views / Downloads
1/0
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
185
Scopus Citation Count
190
WoS h-index
6
Scopus h-index
6
Patents
0
Projects
2
WoS Citations per Publication
12.33
Scopus Citations per Publication
12.67
Open Access Source
14
Supervised Theses
0
| Journal | Count |
|---|---|
| Physıcal Revıew A | 6 |
| Physical Review A | 2 |
| Canadıan Journal of Physıcs | 2 |
| Quantum Informatıon Processıng | 2 |
| Entropy | 1 |
Current Page: 1 / 2
Scopus Quartile Distribution
Competency Cloud
15 results
Scholarly Output Search Results
Now showing 1 - 10 of 15
Article Citation - WoS: 3Citation - Scopus: 3Time-Invariant Discord: High Temperature Limit and Initial Environmental Correlations(Springer, 2018) Tabesh, F. T.; Karpat, G.; Maniscalco, S.; Salimi, S.; Khorashad, A. S.We present a thorough investigation of the phenomena of frozen and time-invariant quantum discord for two-qubit systems independently interacting with local reservoirs. Our work takes into account several significant effects present in decoherence models, which have not been yet explored in the context of time-invariant quantum discord, but which in fact must be typically considered in almost all realistic models. Firstly, we study the combined influence of dephasing, dissipation and heating reservoirs at finite temperature. Contrarily to previous claims in the literature, we show the existence of time-invariant discord at high temperature limit in the weak coupling regime and also examine the effect of thermal photons on the dynamical behavior of frozen discord. Secondly, we explore the consequences of having initial correlations between the dephasing reservoirs. We demonstrate in detail how the time-invariant discord is modified depending on the relevant system parameters such as the strength of the initial amount of entanglement between the reservoirs.Article Citation - WoS: 3Citation - Scopus: 3Remote Polarization-Entanglement Generation by Local Dephasing and Frequency Up-Conversion(Amer Physical Soc, 2017) Raja, S. Hamedani; Karpat, G.; Laine, E. -M.; Maniscalco, S.; Piilo, J.; Li, C. -F.; Guo, G. -C.We introduce a scheme for remote entanglement generation for the photon polarization. The technique is based on transferring the initial frequency correlations to specific polarization-frequency correlations by local dephasing and their subsequent removal by frequency up-conversion. On fundamental level, our theoretical results show how to create and transfer entanglement, to particles which never interact, by means of local operations. This possibility stems from the multipath interference and its control in frequency space. For applications, the developed techniques and results allow for the remote generation of entanglement with distant parties without Bell state measurements and open the perspective to probe frequency-frequency entanglement by measuring the polarization state of the photons.Article Citation - WoS: 39Citation - Scopus: 39Quantum Synchronization in a Collision Model(Amer Physical Soc, 2019) Karpat, G.; Yalcinkaya, I; Cakmak, B.We reveal the emergence of environment-induced spontaneous synchronization between two spin-1/2 quantum objects in a collision model setting. In particular, we determine the conditions for the dynamical establishment of synchronous evolution between local spin observables of a pair of spins undergoing open-system dynamics in the absence of an external drive. Exploiting the versatility of the collision model framework, we show that the formation of quantum or classical correlations between the principal spin pair is of no significant relevance to the manifestation of spontaneous quantum synchronization between them. Furthermore, we discuss the consequences of thermal effects on the environmental spins for the emergence of quantum synchronization.Article Citation - WoS: 21Citation - Scopus: 23Estimating the Degree of Non-Markovianity Using Machine Learning(Amer Physical Soc, 2021) Fanchini, Felipe F.; Karpat, Goktug; Rossatto, Daniel Z.; Norambuena, Ariel; Coto, RaulIn the last few years, the application of machine learning methods has become increasingly relevant in different fields of physics. One of the most significant subjects in the theory of open quantum systems is the study of the characterization of non-Markovian memory effects that emerge dynamically throughout the time evolution of open systems as they interact with their surrounding environment. Here we consider two well-established quantifiers of the degree of memory effects, namely, the trace distance and the entanglement-based measures of non-Markovianity. We demonstrate that using machine learning techniques, in particular, support vector machine algorithms, it is possible to estimate the degree of non-Markovianity in two paradigmatic open system models with high precision. Our approach can be experimentally feasible to estimate the degree of non-Markovianity, since it requires a single or at most two rounds of state tomography.Article Citation - WoS: 4Citation - Scopus: 3Symmetry in the Open-System Dynamics of Quantum Correlations(Nature Publishing Group, 2017) Lyyra, Henri; Karpat, Goktug; Li, Chuan-Feng; Guo, Guang-Can; Piilo, Jyrki; Maniscalco, SabrinaWe study the symmetry properties in the dynamics of quantum correlations for two-qubit systems in one-sided noisy channels, with respect to a switch in the location of noise from one qubit to the other. We consider four different channel types, namely depolarizing, amplitude damping, bit-flip, and bit-phase-flip channel, and identify the classes of initial states leading to symmetric decay of entanglement, non-locality and discord. Our results show that the symmetric decay of quantum correlations is not directly linked to the presence or absence of symmetry in the initial state, while it does depend on the type of correlation considered as well as on the type of noise. We prove that asymmetric decay can be used to infer, in certain cases, characteristic properties of the channel. We also show that the location of noise may lead to dramatic changes in the persistence of phenomena such as entanglement sudden death and time-invariant discord.Article Citation - WoS: 25Citation - Scopus: 27Synchronization and Non-Markovianity in Open Quantum Systems(Amer Physical Soc, 2021) Karpat, Goktug; Yalcinkaya, Iskender; Cakmak, Baris; Luca Giorgi, Gian; Zambrini, RobertaY 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.Article Citation - WoS: 32Citation - Scopus: 32Quantum Synchronization of Few-Body Systems Under Collective Dissipation(Amer Physical Soc, 2020) Karpat, G.; Yalcinkaya, I; Cakmak, B.We explore the environment-induced synchronization phenomenon in two-level systems in contact with a thermal dissipative environment. We first discuss the conditions under which synchronization emerges between a pair of two-level particles. That is, we analyze the impact of various model parameters on the emergence of (anti-)synchronization such as the environment temperature, the direct interaction between the particles, and the distance between them controlling the collectivity of the dissipation. We then enlarge the system to be composed of three two-level atoms to study the mutual synchronization between different particle pairs. Remarkably, we observe in this case a rich synchronization dynamics which stems from different possible spatial configurations of the atoms. Particularly, in sharp contrast with the two-atom case, we show that when the three atoms are in close proximity, the appearance of antisynchronization can be obstructed across all particle pairs due to frustration.Article Citation - WoS: 3Citation - Scopus: 3Continuous Dynamical Decoupling and Decoherence-Free Subspaces for Qubits With Tunable Interaction(Springer, 2019) Yalcinkaya, I.; Cakmak, B.; Karpat, G.; Fanchini, F. F.Protecting quantum states from the decohering effects of the environment is of great importance for the development of quantum computation devices and quantum simulators. Here, we introduce a continuous dynamical decoupling protocol that enables us to protect the entangling gate operation between two qubits from the environmental noise. We present a simple model that involves two qubits which interact with each other with a strength that depends on their mutual distance and generates the entanglement among them, as well as in contact with an environment. The nature of the environment, that is, whether it acts as an individual or common bath to the qubits, is also controlled by the effective distance of qubits. Our results indicate that the introduced continuous dynamical decoupling scheme works well in protecting the entangling operation. Furthermore, under certain circumstances, the dynamics of the qubits naturally led them into a decoherence-free subspace which can be used complimentary to the continuous dynamical decoupling.Article Citation - WoS: 5Citation - Scopus: 6Entropy Production in Non-Markovian Collision Models: Information Backflow Vs. System-Environment Correlations(Mdpi, 2022) Senyasa, Huseyin T.; Kesgin, Sahinde; Karpat, Goktug; Cakmak, BarisWe 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.Conference Object Citation - WoS: 25Citation - Scopus: 26Entropic Uncertainty Relation Under Correlated Dephasing Channels(Canadian Science Publishing, Nrc Research Press, 2018) Karpat, GoktugUncertainty relations are a characteristic trait of quantum mechanics. Even though the traditional uncertainty relations are expressed in terms of the standard deviation of two observables, there exists another class of such relations based on entropic measures. Here we investigate the memory-assisted entropic uncertainty relation in an open quantum system scenario. We study the dynamics of the entropic uncertainty and its lower bound, related to two incompatible observables, when the system is affected by noise, which can be described by a correlated Pauli channel. In particular, we demonstrate how the entropic uncertainty for these two incompatible observables can be reduced as the correlations in the quantum channel grow stronger.