Researcher:
Pusuluk, Onur

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Onur

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Pusuluk

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Pusuluk, Onur

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2019 - 201912020 - 20223

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Researcher Of Publications: search.filters.isAuthorOfPublication.c87eeb17-95ae-4493-85f2-2f4a91d236f8

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    Quantum correlations in Jahn-Teller molecular systems simulated with superconducting circuits
    (IOP Publishing Ltd, 2022) N/A; Department of Physics; Department of Physics; N/A; Müstecaplıoğlu, Özgür Esat; Pusuluk, Onur; Pedram, Ali; Faculty Member; Researcher; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 1674; N/A; N/A
    We explore quantum correlations, in particular, quantum entanglement, among vibrational phonon modes as well as between electronic and vibrational degrees of freedom in molecular systems, described by Jahn-Teller mechanism. Specifically, to isolate and simplify the phonon-electron interactions in a complex molecular system, the basis of our discussions is taken to be the proposal of simulating two-frequency Jahn-Teller systems using superconducting circuit quantum electrodynamics systems (circuit QED) by Tekin Dereli and co-workers in 2012. We evaluate the quantum correlations, in particular entanglement between the vibrational phonon modes, and present analytical explanations using a single privileged Jahn-Teller mode picture. Furthermore, spin-orbit entanglement or quantum correlations between electronic and vibrational degrees of freedom are examined. We conclude by discussing experimental feasibility to detect such quantum correlations, considering the dephasing and decoherence in state-of-the-art superconducting two-level systems (qubits).
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    Quantum Rayleigh problem and thermocoherent Onsager relations
    (American Physical Society (APS), 2021) Department of Physics; Müstecaplıoğlu, Özgür Esat; Pusuluk, Onur; Faculty Member; Department of Physics; College of Sciences; 1674; N/A
    The role of quantum coherence and correlations in heat flow and equilibration is investigated by exploring the Rayleigh's dynamical problem to equilibration in the quantum regime and following Onsager's approach to thermoelectricity. Specifically, we consider a qubit bombarded by two-qubit projectiles from a side. For arbitrary collision times and initial states, we develop the master equation for sequential and collective collisions. By deriving the Fokker-Planck equation out of the master equation, we identify the quantum version of the Rayleigh's heat conduction equation. We find that quantum discord and entanglement shared between the projectiles can contribute to genuine heat flow only when they are associated with so-called heat-exchange coherences. Analogous to Onsager's use of Rayleigh's principle of least dissipation of energy, we use the entropy production rate to identify the coherence current. Both coherence and heat flows can be written in the form of quantum Onsager relations, from which we predict coherent Peltier and coherent Seebeck effects. The effects can be optimized by the collision times and collectivity. Finally, we discuss some of the possible experimental realizations and technological applications of the thermocoherent phenomena in different platforms.
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    PublicationOpen Access
    Emergence of correlated proton tunnelling in water ice
    (The Royal Society, 2019) Farrow, Tristan; Deliduman, Cemsinan; Vedral, Vlatko; Department of Physics; Pusuluk, Onur; Department of Physics; Graduate School of Sciences and Engineering
    Several experimental and theoretical studies report instances of concerted or correlated multiple proton tunnelling in solid phases of water. Here, we construct a pseudo-spin model for the quantum motion of protons in a hexameric H2O ring and extend it to open system dynamics that takes environmental effects into account in the form of O-H stretch vibrations. We approach the problem of correlations in tunnelling using quantum information theory in a departure from previous studies. Our formalism enables us to quantify the coherent proton mobility around the hexagonal ring by one of the principal measures of coherence, the l(1) norm of coherence. The nature of the pairwise pseudo-spin correlations underlying the overall mobility is further investigated within this formalism. We show that the classical correlations of the individual quantum tunnelling events in long-time limit is sufficient to capture the behaviour of coherent proton mobility observed in low-temperature experiments. We conclude that long-range intra-ring interactions do not appear to be a necessary condition for correlated proton tunnelling in water ice.
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    Classical and quantum orbital correlations in molecular electronic states
    (Institute of Physics (IOP) Publishing, 2022) Vedral, Vlatko; Department of Physics; Department of Chemistry; Müstecaplıoğlu, Özgür Esat; Yurtsever, İsmail Ersin; Pusuluk, Onur; Yeşiller, Mahir Hüseyin; Torun, Gökhan; Faculty Member; Other; Department of Physics; Department of Chemistry; College of Sciences; Graduate School of Sciences and Engineering; 1674; 7129; N/A; N/A; N/A
    The quantum superposition principle has been extensively utilized in the quantum mechanical description of bonding phenomenon. It explains the emergence of delocalized molecular orbitals and provides a recipe for the construction of near-exact electronic wavefunctions. On the other hand, its existence in composite systems may give rise to nonclassical correlations that are regarded as a resource in quantum technologies. Here, we approach the electronic ground states of three prototypical molecules in the light of the framework set by fermionic information theory. By introducing the notion of orbital discord, we additively decompose the pairwise orbital correlations into their classical and quantum parts in the presence of superselection rules. We observe that quantum orbital correlations can be stronger than classical orbital correlations though not often. Moreover, quantum orbital correlations can survive even in the absence of orbital entanglement depending on the symmetries of the constituent orbitals. Finally, we demonstrate that orbital entanglement would be underestimated if the orbital density matrices were treated as qubit states.