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Braiding fractional quantum Hall quasiholes on a superconducting quantum processor

Physical Review B 2023年第6期108卷 064303-064303页

作者： Ammar Kirmani Derek S. Wang Pouyan Ghaemi Armin Rahmani Physics Department City College of the City University of New York New York 10031 USA IBM Quantum IBM T.J. Watson Research Center Yorktown Heights 10598 USA Physics Program Graduate Center of City University of New York New York 10031 USA Department of Physics and Astronomy and Advanced Materials Science and Engineering Center Western Washington University Bellingham Washington 98225 USA

Direct experimental detection of anyonic exchange statistics in fractional quantum Hall systems by braiding the excitations and measuring the wave-function phase is an enormous challenge. Here, we use a small, noisy quantum computer to emulate direct braiding within the framework of a simplified model applicable to a thin cylinder geometry and measure the topological phase. Our algorithm first prepares the ground state with two quasiholes. It then applies a unitary operation controlled by an ancilla, corresponding to a sequence of adiabatic evolutions that take one quasihole around the other. We finally extract the phase of the wave function from measuring the ancilla with a compound error mitigation strategy. Our results point out an avenue for studying braiding statistics in fractional Hall states.

关键词： Anyons Fractional quantum Hall effect Quantum algorithms Superconducting devices

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engineering Topological States in Arrays of Two-mode Nanostructured Dielectric Waveguides

Engineering Topological States in Arrays of Two-mode Nanostr...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： A. O. Mikhin V. Rutckaia R. S. Savelev I. S. Sinev A. Alù M. A. Gorlach School of Physics and Engineering ITMO University Saint Petersburg Russia Photonics Initiative Advanced Science Research Center The City University of New York New York USA Centre for Innovation Competence SiLi-Nano Martin-Luther-University Germany Physics Program Graduate Center The City University of New York New York USA

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

Designs of the optical structures that support topologically nontrivial states typically rely on the combining of simple single-mode meta-atoms in a lattice with a symmetry that guarantees the occurrence of the topological states. Here, we explore an alternative approach that does not require the use of complex lattice geometries, but instead relies on the tailoring of the spatial distribution of the near fields in the individual meta-atoms operating in the multi-mode regime. To this end we consider specially designed subwavelength grating dielectric waveguides with two quasi-degenerate modes that interfere in the near-field zone leading to highly asymmetric field patterns of the propagating waves. We show that a one-dimensional array of such waveguides exhibits non-trivial topological properties and supports topological edge states even with one waveguide in the unit cell. Theoretical predictions are confirmed experimentally by visualizing the excited states of the array by measuring the intensity of the radiation at the frequency of the third harmonic.

关键词： Visualization Lattices Electromagnetic waveguides Waveguide lasers Optical waveguide theory Frequency measurement Dielectrics

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Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Rui Xu Tong Lin Jiaming Luo Xiaotong Chen Elizabeth R. Blackert Alyssa R. Moon Khalil M. JeBailey Hanyu Zhu Department of Materials Science and Nano Engineering Rice University Houston U.S.A. Applied Physics Graduate Program Rice University Houston U.S.A. Nanotechnology Research Experience for Undergraduates (Nano REU) Program Rice University Houston U.S.A.

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO 3 . We designed planar ultrafast concentrators that amplifies transient electric fiel... 详细信息

ISBN: (纸本)9781957171258

关键词： Concentrators Electric fields Fast Fourier transforms Field enhancement Fused silica Second harmonic generation

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Applications of Floquet-Magnus and Fer Expansion Approaches during Cross Polarization Radiation in Solid State NMR

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Journal of Modern physics 2023年第7期14卷 1136-1156页

作者： Eugene Stephane Mananga Thibault Charpentier Program of Physics & Ph. D Program of Chemistry Graduate Center The City University of New York New York NY USA Department of Applied Physics New York University Brooklyn New York USA Department of Engineering Physics and Technology BCC The City University of New York Bronx New York USA CEA IRAMIS Service Interdisciplinaire sur les Systèmes Moléculaires et Matériaux LSDRM UMR CEA/CNRS Gif-sur-Yvette

This paper investigates the concept of Cross Polarization (CP) experiment in addition to revisiting the two potential expansion schemes recently developed in the field of solid-state nuclear magnetic resonance (SSNMR): namely, the Floquet-Magnus expansion and the Fer expansion. We use the aforementioned expansion schemes for the calculation of effective Hamiltonians and propagators when the spin system undergoes Cross Polarization radiation. CP is the gateway experiment into SSNMR. An in-depth comprehension of the underlying mechanics of spin dynamics during the cross-polarization experiment is pivotal for further experimental developments and optimization of more complex solid-state NMR experiments. The main contribution of this work is a prospect related to spin physics;particularly regarding to generalization of the calculation. This work reports original yet interesting novel ideas and developments that include calculations performed on the CP experiment. In fact, the approach presented could play a major role in the interpretation of several fine NMR experiments in solids, which would in turn provide significant new insights in spin physics. The generality of the work points towards potential applications in problems related in solid-state NMR and theoretical developments of spectroscopy as well as interdisciplinary research areas as long as they include spin dynamics concepts.

关键词： Cross Polarization Solid-State NMR Floquet-Magnus Expansion Fer Expansion Spin Dynamics

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Effect of loops on the mean-square displacement of Rouse-model chromatin

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Physical Review E 2024年第4期109卷 044502-044502页

作者： Tianyu Yuan Hao Yan Mary Lou P. Bailey Jessica F. Williams Ivan Surovtsev Megan C. King Simon G. J. Mochrie Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Physics Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA Department of Cell Biology Yale School of Medicine New Haven Connecticut 06520 USA Department of Molecular Cell and Developmental Biology Yale University New Haven Connecticut 06511 USA

Chromatin polymer dynamics are commonly described using the classical Rouse model. The subsequent discovery, however, of intermediate-scale chromatin organization known as topologically associating domains (TADs) in experimental Hi-C contact maps for chromosomes across the tree of life, together with the success of loop extrusion factor (LEF) model in explaining TAD formation, motivates efforts to understand the effect of loops and loop extrusion on chromatin dynamics. This paper seeks to fulfill this need by combining LEF-model simulations with extended Rouse-model polymer simulations to investigate the dynamics of chromatin with loops and dynamic loop extrusion. We show that loops significantly suppress the averaged mean-square displacement (MSD) of a gene locus, consistent with recent experiments that track fluorescently labeled chromatin loci. We also find that loops reduce the MSD's stretching exponent from the classical Rouse-model value of 1/2 to a loop-density-dependent value in the 0.45–0.40 range. Remarkably, stretching exponent values in this range have also been observed in recent experiments [Weber et al., Phys. Rev. Lett. 104, 238102 (2010); Bailey et al., Mol. Biol. Cell 34, ar78 (2023)]. We also show that the dynamics of loop extrusion itself negligibly affects chromatin mobility. By studying static “rosette” loop configurations, we also demonstrate that chromatin MSDs and stretching exponents depend on the location of the locus in question relative to the position of the loops and on the local friction environment.

关键词： Chromatin Chromosomes DNA Polymers Brownian dynamics Langevin equation Rouse model

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Effect of Fe on the Photo/Piezocatalytic Activity of Bazr1-2xfe2xo3-Δ Ceramics

SSRN

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SSRN 2023年

作者： Fernandes, Daiane Hernandes, Paola Gay Moreira, Mario Lucio Raubach, Cristiane Wienke Jardim, Pedro Lovato Gomes Ferrer, Mateus Meneghetti Moreira, Eduardo Ceretta Mastelaro, Valmor Roberto Cava, Sergio da S. Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Spectroscopy Laboratory Federal University of Pampa RS Bagé96413-172 Brazil Physics Institute São Paulo University SP São Carlos13560-970 Brazil

BaZr1-2xFe2xO3-δ (x=0.00, 0.02, 0.04 and 0.08) samples were prepared by microwave-assisted hydrothermal method quickly and at low-temperature. Furthermore, we explored for the first time the effect of iron (Fe) in the barium zirconate (BZO) lattice on photocatalytic and piezocatalytic activity to degrade organic dye. Fe insertion reduced the band gap, altered the electronic structure and induced luminescence quenching. The catalytic activity of the samples was analyzed through the degradation of the rhodamine B (RhB) dye. The photocatalytic experiment was performed under UVC light and the piezocatalytic experiment under ultrasonic vibration. The pure sample of BZO showed better photocatalytic performance, while the insertion of Fe was unfavorable to degrade RhB. In contrast, pure BZO has negligible piezocatalytic activity, but a low Fe content is highly beneficial for promoting piezocatalysis. Based on the findings, this study provides important information for obtaining effective photocatalysts and piezocatalysts to be used in environmental remediation. © 2023, The Authors. All rights reserved.

关键词： Iron

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FBG-Based Sensing System to Improve Tactile Sensitivity of Robotic Manipulators Working in Unstructured Environments

SSRN

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SSRN 2023年

作者： Biazi-Neto, Vitorino Marques, Carlos A.F. Frizera-Neto, Anselmo Leal-Junior, Arnaldo G. Graduate Program in Electrical Engineering Federal University of Espírito Vitória ES Santo29075-910 Brazil i3N & Physics Department University of Aveiro Aveiro3810-193 Portugal

The emergence of Industry 4.0 has brought new concepts to the factories that optimize and improve conventional processes. These technologies have brought assignments to the industrial robots that allow them to perform tasks faster and more precisely. The improvement of the robot’s proprioception capacity and tactile sensitivity using sensors is a useful approach to achieve those goals. Optical fibers are a viable technology to be used as sensors in robotic devices because they are electrically passive and present electromagnetic immunity. This paper proposes a Fiber Bragg Grating (FBG) based sensing system to monitor robotic manipulators during their operation. It corresponds to smart textiles installed on the robot’s body to detect interactions with the environment. A mathematical model is proposed to determine the maximum distance between FBGs on the system to achieve the system’s best spatial resolution. The tactile system is formed of a group of optical fibers with multiplexed FBGs embedded in silicone rubber. The optical fibers with the sensors are positioned between layers of polyethylene foam and cotton fabric. After the manufacturing process, temperature and force characterization were done on the sensors which make up the smart textiles. In the characterization results, almost all the FBG presented values of R² on the linear regression superior to 0.94. Individual analysis is performed for the sensors which present a low coefficient of determination. Finally, the system was tested in an experimental validation in which the robot was hit while executing a task. From the results, it can be observed that the system can provide the position on the robot’s body, the amplitude in terms of force and the instant of time in which an external impact occurred. © 2023, The Authors. All rights reserved.

关键词： Fiber Bragg gratings

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All-optical nonreciprocal response in a ring resonator integrating transition metal dichalcogenides

All-optical nonreciprocal response in a ring resonator integ...

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CLEO: Science and Innovations, S and I 2022

作者： Kawaguchi, Yuma Guddala, Sriram Komissarenko, Filipp Kiriushechkina, Svetlana Vakulenko, Anton Chen, Kai Alù, Andrea Menon, Vinod M. Khanikaev, Alexander B. Department of Electrical Engineering Grove School of Engineering City College of the City University of New York New YorkNY United States Physics Program Graduate Center of the City University of New York New YorkNY United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY United States Department of Physics City College of New York New YorkNY United States

The photoinduced nonreciprocity was experimentally observed in WS2 monolayer pumped by circularly polarized light. Based on this, we propose a theoretical model of nonreciprocal optical ring resonator integrating vall... 详细信息

ISBN: (纸本)9781557528209

关键词： Monolayers

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Effect of Fe on the Photo/Piezocatalytic Activity of Bazr1-2xfe2xo3-Δ Ceramics

SSRN

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SSRN 2023年

作者： Fernandes, Daiane Hernandes, Paola Gay Moreira, Mario Lucio Raubach, Cristiane Wienke Gomes Jardim, Pedro Lovato Ferrer, Mateus Meneghetti Moreira, Eduardo Ceretta Mastelaro, Valmor Roberto Cava, Sergio da S. Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Spectroscopy Laboratory Federal University of Pampa RS Bagé96413-172 Brazil Physics Institute São Paulo University SP São Carlos13560-970 Brazil

关键词： Temperature

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Designing Classical Header Bits for Quantum Wrapper Networking with O-band Quantum Signal

Designing Classical Header Bits for Quantum Wrapper Networki...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Gül, G. Berkay On, M. Singh, S.K. Proietti, R. Kanter, G.S. Yoo, S.J.B. Kumar, P. Graduate Program in Applied Physics Northwestern University 2145 Sheridan Road EvanstonIL60208 United States Department of Electrical and Computer Engineering University of California Davis DavisCA95616 United States Department of Electronics and Communication Eng. Indian Institute of Technology Roorkee247667 India Department of Electronics and Telecommunications Engineering Politecnico di Torino Italy Center for Photonic Communication and Computing Dept. of Electrical and Computer Eng. Northwestern University EvanstonIL60208 United States

We investigate the impact of wavelength choice for the classical headers in quantum wrapper networking with O-band quantum payload. We show that a C-band header performs substantially better than an O-band header. ... 详细信息

ISBN: (纸本)9781957171296

关键词： Bandpass filters Beam splitters Bit error rate Entanglement distribution Quantum teleportation Raman scattering

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