Researcher:
Tuncer, Aslı

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Aslı

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Tuncer

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Tuncer, Aslı

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2019 - 20203

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Researcher Of Publications: search.filters.isAuthorOfPublication.90f1288a-243f-4d24-80fd-ca6063f2794f

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    Quantum thermodynamics and quantum coherence engines
    (Scientific Technical Research Council Turkey-Tubitak, 2020) Department of Physics; Department of Physics; Department of Physics; Tuncer, Aslı; Müstecaplıoğlu, Özgür Esat; Researcher; Faculty Member; College of Sciences; College of Sciences; N/A; 1674
    The advantages of quantum effects in several technologies, such as computation and communication, have already been well appreciated. Some devices, such as quantum computers and communication links, exhibiting superiority to their classical counterparts, have been demonstrated. the close relationship between information and energy motivates us to explore if similar quantum benefits can be found in energy technologies. investigation of performance limits for a broader class of information-energy machines is the subject of the rapidly emerging field of quantum thermodynamics. Extension of classical thermodynamical laws to the quantum realm is far from trivial. This short review presents some of the recent efforts in this fundamental direction. It focuses on quantum heat engines and their efficiency bounds when harnessing energy from nonthermal resources, specifically those containing quantum coherence and correlations.
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    Explicit construction of the eigenvectors and eigenvalues of the graph Laplacian on the Cayley tree
    (Elsevier, 2020) Erzan, Ayşe; Department of Physics; Department of Physics; Tuncer, Aslı; Researcher; Graduate School of Sciences and Engineering
    A generalized Fourier analysis on arbitrary graphs calls for a detailed knowledge of the eigenvectors of the graph Laplacian. Using the symmetries of the Cayley tree, we recursively construct the family of eigenvectors with exponentially growing eigenspaces, associated with eigenvalues in the lower part of the spectrum. The spectral gap decays exponentially with the tree size, for large trees. The eigenvalues and eigenvectors obey recursion relations which arise from the nested geometry of the tree.
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    PublicationOpen Access
    Work and heat value of bound entanglement
    (Springer, 2019) Dağ, Ceren B.; Özaydın, Fatih; Department of Physics; Department of Physics; Tuncer, Aslı; Izadyari, Mohsen; Müstecaplıoğlu, Özgür Esat; Faculty Member; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; 1674
    Entanglement has recently been recognized as an energy resource which can outperform classical resources if decoherence is relatively low. Multi-atom entangled states can mutate irreversibly to so-called bound entangled (BE) states under noise. Resource value of BE states in information applications has been under critical study, and a few cases where they can be useful have been identified. We explore the energetic value of typical BE states. Maximal work extraction is determined in terms of ergotropy. Since the BE states are nonthermal, extracting heat from them is less obvious. We compare single and repeated interaction schemes to operationally define and harvest heat from BE states. BE and free entangled (FE) states are compared in terms of their ergotropy and maximal heat values. Distinct roles of distillability in work and heat values of FE and BE states are pointed out. Decoherence effects in dynamics of ergotropy and mutation of FE states into BE states are examined to clarify significance of the work value of BE states. Thermometry of distillability of entanglement using micromaser cavity is proposed.