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Lévy flights and Lévy walks under stochastic resetting

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arXiv 2023年

作者： Zbik, Bartosz Dybiec, Bartlomiej Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Kraków30-348 Poland Institute of Theoretical Physics Mark Kac Center for Complex Systems Research Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Kraków30-348 Poland

Stochastic resetting is a protocol of starting anew, which can be used to facilitate the escape kinetics. We demonstrate that restarting can accelerate the escape kinetics from a finite interval restricted by two absorbing boundaries also in the presence of heavy-tailed, Lévy type, α-stable noise. However, the width of the domain where resetting is beneficial depends on the value of the stability index α determining power-law decay of jump length distribution. For heavier (smaller α) distributions the domain becomes narrower in comparison to lighter tails. Additionally, we explore connections between Lévy flights and Lévy walks in presence of stochastic resetting. First of all, we show that for Lévy walks, the stochastic resetting can be beneficial also in the domain where coefficient of variation is smaller than 1. Moreover, we demonstrate that in the domain where LW are characterized by a finite mean jump duration/length, with the increasing width of the interval LW start to share similarities with LF under stochastic resetting. Copyright © 2023, The Authors. All rights reserved.

关键词： Stochastic systems

Photonic Crystal Design for Bloch Surface Wave Sensing 5

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Photonic Crystal Design for Bloch Surface Wave Sensing

5th International Conference on Applications of Optics and Photonics, AOP 2022

作者： Dias, Bernardo De Almeida, José M. M. M. Coelho, Luís C. C. INESC TEC-Institute for Systems and Computer Engineering Technology and Science Faculty of Sciences University of Porto Porto4169-007 Portugal Department of Physics and Astronomy Faculty of Sciences University of Porto Porto4169-007 Portugal Department of Physics School of Science and Technology University of Trás-os-Montes e Alto Douro Vila Real5001-801 Portugal

Bloch Surface Waves (BSW) consist of electromagnetic modes generated at the interface between a photonic crystal and an isotropic dielectric. This type of surface mode displays sharp resonances and high sensitivity to external refractive index variations, and thus appears to be an ideal candidate for usage in optical sensors. Nevertheless, design and optimization of photonic crystals is not a trivial task and constitutes an ongoing field of research. The sensitivity of BSW in both refractometric and adsorption sensing is calculated analytically using first-order perturbation theory for TE modes, allowing the understanding of how several physical parameters of the photonic crystal influence the sensitivity. Preliminary experimental results are presented, which aim to use the analytical calculations to allow for both refractometric and adsorption sensing in a single photonic crystal structure. © Published under licence by IOP Publishing Ltd.

关键词： Photonic crystals

Multimodal Analysis of Traction Forces and Temperature Dynamics of Living Cells with Diamond-Embedded Substrate

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arXiv 2024年

作者： Kolodziej, Tomasz Mrózek, Mariusz Sengottuvel, Saravanan Glowacki, Maciej J. Ficek, Mateusz Gawlik, Wojciech Rajfur, Zenon Wojciechowski, Adam Jagiellonian University Medical School Faculty of Pharmacy Kraków Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Kraków Poland Gdansk University of Technology Faculty of Electronics Telecommunications and Informatics Department of Metrology and Optoelectronics Gdańsk Poland

Cells and tissues are constantly exposed to various chemical and physical signals that intricately regulate various physiological and pathological processes. This study explores the integration of two biophysical methods, Traction Force Microscopy (TFM) and Optically-Detected Magnetic Resonance (ODMR), to concurrently assess cellular traction forces and local relative temperature. We present a novel elastic substrate with embedded nitrogen-vacancy microdiamonds, that facilitate ODMR-TFM measurements. Optimization efforts have focused on minimizing the sample illumination and experiment duration to mitigate biological perturbations. Our hybrid ODMR-TFM technique yields precise TFM maps and achieves approximately 1K accuracy in relative temperature measurements. Notably, our setup, employing a simple wide-field fluorescence microscope with standard components, demonstrates the broader feasibility of these techniques in life-science laboratories. By elucidating the physical aspects of cellular behavior beyond the existing methods, this approach opens avenues for a deeper understanding and may inspire diverse biomedical applications. © 2024, CC BY.

关键词： Temperature measurement

Magnetocaloric performance of RE5Pd2In4 (RE = Tb-Tm) compounds

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arXiv 2024年

作者： Hayyu, Altifani Rizky Baran, Stanislaw Szytula, Andrzej Jagiellonian University Doctoral School of Exact and Natural Sciences Faculty of Physics Astronomy and Applied Computer Science prof. Stanislawa Lojasiewicza 11 KrakówPL-30-348 Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science M. Smoluchowski Institute of Physics prof. Stanislawa Lojasiewicza 11 KrakówPL-30-348 Poland

Magnetocaloric performance of the RE5Pd2In4 (RE = Tb-Tm) rare earth compounds has been investigated using measurements of magnetization in the function of temperature and applied magnetic field. The maximum magnetic entropy change (−∆SMmax) at magnetic flux density change (∆µ0H) of 0-9 T has been determined to be 3.3 J·kg−1·K−1 at 62 K for Tb5Pd2In4, 7.0 J·kg−1·K−1 at 22 K for Dy5Pd2In4, 12.6 J·kg−1·K−1 at 22 K for Ho5Pd2In4, 12.1 J·kg−1·K−1 at 17 K for Er5Pd2In4 and 11.9 J·kg−1·K−1 at 9.0 K for Tm5Pd2In4. The temperature averaged entropy change (TEC) with 3 K span equals 3.2, 7.0, 12.6, 12.2 and 11.8 J·kg−1·K−1 for RE = Tb-Tm, respectively. The relative cooling power (RCP) and refrigerant capacity (RC) are equal to respectively 258 and 215 J·kg−1 in Tb5Pd2In4, 498 and 325 J·kg−1 in Dy5Pd2In4, 489 and 403 J·kg−1 in Ho5Pd2In4, 403 and 314 J·kg−1 in Er5Pd2In4 and 234 and 184 J·kg−1 in Tm5Pd2In4. The magnetocaloric properties of RE5Pd2In4 are comparable to those of other known magnetocaloric materials, which show good magnetocaloric performance at low temperatures. Among RE5Pd2In4, the highest values of parameters characterizing the magnetocaloric effect are found for RE = Ho and Er. Furthermore, for fixed RE element, the RE5Pd2In4 compound displays the highest RCP and RC values when compared to those of its isostructural RE5T2In4 (T = Ni, Pt) analogues. © 2024, CC BY.

关键词： Magnetocaloric effects

Scanning gate microscopy of nonretracing electron-hole trajectories in a normal-superconductor junction

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arXiv 2023年

作者： Maji, S. Sowa, K. Nowak, M.P. AGH University of Krakow Academic Centre for Materials and Nanotechnology al. A. Mickiewicza 30 Krakow30-059 Poland AGH University of Krakow Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland

We theoretically study scanning gate microscopy (SGM) of electron and hole trajectories in a quantum point contact (QPC) embedded in a normal-superconductor (NS) junction. At zero voltage bias, the electrons and holes transported through the QPC form angular lobes and are subject to self-interference, which marks the SGM conductance maps with interference fringes analogously as in normal systems. We predict that for an NS junction at non-zero bias a beating pattern is to occur in the conductance probed with the use of the SGM technique owing to a mismatch of the Fermi wavevectors of electrons and holes. Moreover, the SGM technique exposes a pronounced disturbance in the angular conductance pattern, as the retroreflected hole does not retrace the electron path due to wavevector difference. © 2023, CC BY.

关键词： Quantum chemistry

Simulation of the isotropic ultra-high energy photons flux in the solar magnetic field and a comparison with observations made by the HAWC and Fermi-LAT observatories

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Simulation of the isotropic ultra-high energy photons flux i...

38th International Cosmic Ray Conference, ICRC 2023

作者： Homola, Piotr Poncyljusz, Bożena Gora, Dariusz Alvarez Castillo, David E. Sushchov, Oleksandr Stasielak, Jaroslaw Stuglik, Slawomir Nazari, Vahab Oancea, Cristina Beznosko, Dmitriy Zabari, Noemi Gupta, Alok C. Hnatyk, Bohdan Mozgova, Alona Kasztelan, Marcin Bielewicz, Marcin Kovacs, Peter Lozowski, Bartosz Medvedev, Mikhail V. Miszczyk, Justyna Bibrzycki, Lukasz Niedźwiecki, Michal Smelcerz, Katarzyna Hachaj, Tomasz Piekarczyk, Marcin Pawlik, Maciej Rzecki, Krzysztof Rosas, Matías Smolek, Karel Svanidze, Manana Beradze, Revaz Tursunov, Arman Wibig, Tadeusz Zamora-Saa, Jilberto Mędrala, Justyna Opila, Gabriela Pryga, Jerzy Ruimi, Ophir Cahuantzi, Mario Rodriguez Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Kraków31-342 Poland ADVACAM 12 Prague17000 Czech Republic Clayton State University MorrowGA United States Astroteq.ai Ltd. Juliusza Slowackiego 24 Rzeszóow35-069 Poland Manora Peak Nainital263001 India Astronomical Observatory of Taras Shevchenko National University of Kyiv Kyiv04053 Ukraine National Centre for Nuclear Research Andrzeja Soltana 7 Świerk Otwock05-400 Poland Institute for Particle and Nuclear Physics Wigner Research Centre for Physics 29-33 Konkoly-Thege Miklós út Budapest1121 Hungary Faculty of Natural Sciences University of Silesia in Katowice Bankowa 9 Katowice40-007 Poland Department of Physics and Astronomy University of Kansas LawrenceKS66045 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Computer Science Cracow University of Technology Warszawska 24 Kraków31-155 Poland ACC Cyfronet AGH-UST Kraków30-950 Poland AGH University of Science and Technology Mickiewicz Ave. Kraków30-059 Poland Liceo 6 Francisco Bauzá Montevideo Uruguay Institute of Experimental and Applied Physics Czech Technical University in Prague Czech Republic E. Andronikashvili Institute of Physics under Tbilisi State University Georgia Institute of Physics Silesian University in Opava Bezručovo nám. 13 OpavaCZ-74601 Czech Republic University of Lódź Faculty of Physics and Applied Informatics 149/153Pomorska Lódź90-236 Poland Universidad Andres Bello Departamento de Ciencias Fisicas Facultad de Ciencias Exactas Avenida Republica 498 Santiago Chile Faculty of Physics University of Warsaw Warsaw02-093 Poland Faculty of Physics and Applied Computer Science AGH University of Kraków Poland Pedagogical University of Krakow Institute of Computer Science ul. Podchorążych Kraków30-084 Poland Racah Institute of Physics Hebrew University of Jerusalem IL Jerusalem91904 Israel Facultad de Cie

In this contribution we study the possibility of the formation of cosmic ray ensembles (CRE) created by the interaction of ultra-high energy (UHE) photons with the magnetic field of the Sun. The lack of observation of those UHE and the difficulties for their identification given the current methodologies motivates this study. We performed simulations using the PRESHOWER program in order to simulate the expected extensive air showers which might be spatially correlated generated upon entering the Earth’s atmosphere. We found characteristic features like very thing and extremely elongates cascades of secondary photons with their corresponding energies spanning the entire cosmic range spectrum. Shower footprints are as large as hundreds of kilometres. An application of this study is the scenario of gamma-ray emission from the vicinity of the Sun as a result of ultra-high energy photon cascading in the solar magnetic field in order to understand recent observations made by the HAWC and Fermi-LAT observatories. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

Direct and efficient detection of quantum superposition

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Physical Review A 2025年第5期111卷 L050402-L050402页

作者： Daniel Kun Teodor Strömberg Michele Spagnolo Borivoje Dakić Lee A. Rozema Philip Walther Institute of Science and Technology Austria Klosterneuburg Austria Christian Doppler Laboratory for Photonic Quantum Computer Faculty of Physics University of Vienna 1090 Vienna Austria

One of the most striking quantum phenomena is superposition, where one particle simultaneously inhabits different states. Most methods to verify coherent superposition are indirect, in that they require the distinct states to be recombined. Here, we adapt an xor game, in which a “test” photon is placed in a superposition of two orthogonal spatial modes, and each mode is sent to separated parties who perform local measurements on their modes without reinterfering the original modes. We show that by using a second identical “measurement” photon the parties are nonetheless able to verify if the test photon was placed in coherent superposition of the two spatial modes. We then turn this game into a resource-efficient verification scheme, obtaining a confidence that the particle is superposed which approaches unity exponentially fast. We demonstrate our scheme using a single photon, obtaining a 99% confidence that the particle is superposed with only 37 copies. Our work shows the utility of xor games to verify quantum resources, allowing us to efficiently detect quantum superposition without reinterfering the superposed modes.

关键词： Quantum interference phenomena

Transmon probe for quantum characteristics of magnons in antiferromagnets

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Physical Review B 2023年第9期108卷 094430-094430页

作者： Vahid Azimi-Mousolou Anders Bergman Anna Delin Olle Eriksson Manuel Pereiro Danny Thonig Erik Sjöqvist Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan 81746-73441 Iran Department of Physics and Astronomy Uppsala University Box 516 SE-751 20 Uppsala Sweden Department of Applied Physics School of Engineering Sciences KTH Royal Institute of Technology AlbaNova University Center SE-10691 Stockholm Sweden Swedish e-Science Research Center (SeRC) KTH Royal Institute of Technology SE-10044 Stockholm Sweden School of Science and Technology Örebro University SE-701 82 Örebro Sweden

The detection of magnons and their quantum properties, especially in antiferromagnetic (AFM) materials, is a substantial step to realize many ambitious advances in the study of nanomagnetism and the development of energy efficient quantum technologies. The recent development of hybrid systems based on superconducting circuits provides the possibility to engineer quantum sensors that exploit different degrees of freedom. Here, we examine the magnon-photon-transmon hybridization based on bipartite AFM materials, which gives rise to an effective coupling between a transmon qubit and magnons in a bipartite AFM. We demonstrate how magnon modes, their chiralities, and quantum properties, such as nonlocality and two-mode magnon entanglement in bipartite AFMs, can be characterized through the Rabi frequency of the superconducting transmon qubit.

关键词： Magnons Quantum correlations in quantum information Quantum entanglement Quantum metrology Photons Superconducting qubits

Thermal Recall: Memory-Assisted Markovian Thermal Processes

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PRX Quantum 2023年第4期4卷 040304-040304页

作者： Jakub Czartowski A. de Oliveira Junior Kamil Korzekwa Doctoral School of Exact and Natural Sciences Jagiellonian University Kraków 30-348 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków 30-348 Poland

We develop a resource-theoretic framework that allows one to bridge the gap between two approaches to quantum thermodynamics based on Markovian thermal processes (which model memoryless dynamics) and thermal operations (which model arbitrarily non-Markovian dynamics). Our approach is built on the notion of memory-assisted Markovian thermal processes, where memoryless thermodynamic processes are promoted to non-Markovianity by explicitly modeling ancillary memory systems initialized in thermal equilibrium states. Within this setting, we propose a family of protocols composed of sequences of elementary two-level thermalizations that approximate all transitions between energy-incoherent states accessible via thermal operations. We prove that, as the size of the memory increases, these approximations become arbitrarily good for all transitions in the infinite temperature limit, and for a subset of transitions in the finite temperature regime. Furthermore, we present solid numerical evidence for the convergence of our protocol to any transition at finite temperatures. We also explain how our framework can be used to quantify the role played by memory effects in thermodynamic protocols such as work extraction. Finally, our results show that elementary control over two energy levels at a given time is sufficient to generate all energy-incoherent transitions accessible via thermal operations if one allows for ancillary thermal systems.

关键词： Open quantum systems Quantum thermodynamics Resource theories Quantum master equation