Researcher:
Pedram, Ali

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Ali

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Pedram

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Pedram, Ali

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20224

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Researcher Of Publications: search.filters.isAuthorOfPublication.8cccea16-0bde-4d9f-971b-de2e35dee56d

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    Environment-assisted modulation of heat flux in a bio-inspired system based on collision model
    (Mdpi, 2022) N/A; N/A; Department of Physics; Pedram, Ali; Müstecaplıoğlu, Özgür Esat; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; College of Sciences; N/A; 1674
    The high energy transfer efficiency of photosynthetic complexes has been a topic of research across many disciplines. Several attempts have been made in order to explain this energy transfer enhancement in terms of quantum mechanical resources such as energetic and vibration coherence and constructive effects of environmental noise. The developments in this line of research have inspired various biomimetic works aiming to use the underlying mechanisms in biological light harvesting complexes for the improvement of synthetic systems. In this article, we explore the effect of an auxiliary hierarchically structured environment interacting with a system on the steady-state heat transport across the system. The cold and hot baths are modeled by a series of identically prepared qubits in their respective thermal states, and we use a collision model to simulate the open quantum dynamics of the system. We investigate the effects of system-environment, inter-environment couplings and coherence of the structured environment on the steady state heat flux and find that such a coupling enhances the energy transfer. Our calculations reveal that there exists a non-monotonic and non-trivial relationship between the steady-state heat flux and the mentioned parameters.
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    Superiority of the quantum states of light in retinal parameter estimation
    (Optica Publishing Group, 2022) Kominis, Iannis K.; Department of Physics; N/A; Müstecaplıoğlu, Özgür Esat; Pedram, Ali; Faculty Member; PhD Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; 1674; N/A
    Calculating the response of the retinal network to different states of light and computing the Fisher information matrix for the probability distributions of these responses, we show that the quantum light is metrologically superior.
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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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    Using quantum states of light to probe the retinal network
    (American Physical Society (APS), 2022) Kominis, I. K.; Department of Physics; Müstecaplıoğlu, Özgür Esat; Pedram, Ali; Faculty Member; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; 1674; N/A
    The minimum number of photons necessary for activating the sense of vision has been a topic of research for over a century. The ability of rod cells to sense a few photons has implications for understanding the fundamental capabilities of the human visual and nervous system and creating new vision technologies based on photonics. We investigate the fundamental metrological capabilities of different quantum states of light to probe the retina, which is modeled using a simple neural network. Stimulating the rod cells by Fock, coherent, and thermal states of light, and calculating the Cramer-Rao lower bound and Fisher information matrix for the signal produced by the ganglion cells in various conditions, we determine the volume of minimum error ellipsoid. Comparing the resulting ellipsoid volumes, we determine the metrological performance of different states of light for probing the retinal network. The results indicate that the thermal state yields the largest error ellipsoid volume and hence the worst metrological performance, and the Fock state yields the best performance for all parameters. This advantage persists even if another layer is added to the network or optical losses are considered in the calculations.