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arXiv 2021年

作者： Hughes, Ciaran Finke, Doug German, Dan-Adrian Merzbacher, Celia Vora, Patrick M. Lewandowski, Heather J. Fermi National Accelerator Laboratory BataviaIL60510 United States Quantum Computing Report TustinCA92780 United States Luddy School of Informatics Indiana University BloomingtonIN47408 United States Quantum Science and Engineering Center Indiana University BloomingtonIN47408 United States SRI International 1100 Wilson Blvd Suite 2800 ArlingtonVA22209 United States Department of Physics and Astronomy George Mason University FairfaxVA22030 United States Quantum Science and Engineering Center George Mason University FairfaxVA22030 United States JILA National Institute of Standards and Technology the University of Colorado BoulderCO80309 United States Department of Physics University of Colorado Boulder BoulderCO80309 United States

quantum information science and technology (QIST) has progressed significantly in the last decade, such that it is no longer solely in the domain of research labs, but is now beginning to be developed for, and applied in, industrial applications and products. With the emergence of this new quantum industry, a new workforce trained in QIST skills and knowledge is needed. To help support education and training of this workforce, universities and colleges require knowledge of the type of jobs available for their students and what skills and degrees are most relevant for those new jobs. Additionally, students need to know how to tailor their degrees to best align with the current needs of the quantum industry. We report on the results from a survey of 57 companies in the quantum industry, with the goal of elucidating the jobs, skills, and degrees that are relevant for this new workforce. We find a range of job opportunities from highly specific jobs, such as quantum algorithm developer and error correction scientist, to broader jobs categories within the business, software, and hardware sectors. These broader jobs require a range of skills, most of which are not quantum related. Further, except for the highly specific jobs, companies that responded to the survey are looking for a range of degree levels to fill these new positions, from bachelors to masters to PhDs. With this knowledge, students, instructors, and university administrators can make informed decisions about how to address the challenge of increasing the future quantum workforce. © 2021, CC BY.

关键词： Surveys

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Non-Locality6=quantum Entanglement

arXiv

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arXiv 2021年

作者： Guo, Xingyu Ma, Chen-Te Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangdong Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangdong Guangzhou510006 China Asia Pacific Center for Theoretical Physics Pohang University of Science and Technology Gyeongsangbuk-do Pohang37673 Korea Republic of School of Physics and Telecommunication Engineering South China Normal University Guangdong Guangzhou510006 China The Laboratory for Quantum Gravity and Strings Department of Mathematics and Applied Mathematics University of Cape Town Private Bag Rondebosch7700 South Africa

The unique entanglement measure is concurrence in a 2-qubit pure state. The maximum violation of Bell’s inequality is monotonically increasing for this quantity. Therefore, people expect that pure state entanglement is relevant to the non-locality. For justification, we extend the study to three qubits. We consider all possible 3-qubit operators with a symmetric permutation. When only considering one entanglement measure, the numerical result contradicts expectation. Therefore, we conclude "Non-Locality6=quantum Entanglement". We propose the generalized R-matrix or correlation matrix for the new diagnosis of quantum Entanglement. We then demonstrate the evidence by restoring the monotonically increasing result. Copyright © 2021, The Authors. All rights reserved.

关键词： quantum entanglement

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Next-generation high transmission neutron optical devices utilizing micro-machined structures

arXiv

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arXiv 2021年

作者： Kapahi, Connor Sarenac, D. Bleuel, M. Cory, D.G. Heacock, B. Henderson, M. Huber, M.G. Taminiau, I. Pushin, D.A. Institute for Quantum Computing University of Waterloo WaterlooONN2L3G1 Canada Department of Physics University of Waterloo WaterlooONN2L3G1 Canada National Institute of Standards and Technology GaithersburgMD20899 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742-2115 United States Department of Chemistry University of Waterloo WaterlooONN2L3G1 Canada

Neutrons have emerged as a unique probe at the forefront of modern material science, unrivaled in their penetrating abilities. A major challenge stems from the fact that neutron optical devices are limited to refractive indices on the order of n ≈ 1 ± 10−5. By exploiting advances in precision manufacturing, we have designed and constructed a micro-meter period triangular grating with a high aspect ratio of 14.3. The manufacturing quality is demonstrated with white-light interferometric data and microscope imaging. Neutron scattering experiment results are presented, showing agreement to refraction modelling. The capabilities of neutron Fresnel lenses based on this design are contrasted to existing neutron focusing techniques and the path separation of a prism-based neutron interferometer is estimated. Copyright © 2021, The Authors. All rights reserved.

关键词： Aspect ratio

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Spin-induced orbital frustration in a hexagonal optical lattice

arXiv

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arXiv 2021年

作者： Li, Yongqiang Yuan, Jianmin Zhou, Xiaoji Li, Xiaopeng Department of Physics National University of Defense Technology Changsha410073 China Department of Physics Graduate School of China Academy of Engineering Physics Beijing100193 China State Key Laboratory of Advanced Optical Communication System and Network Department of Electronics Peking University Beijing100871 China State Key Laboratory of Surface Physics Institute of Nanoelectronics and Quantum Computing Department of Physics Fudan University Shanghai200438 China Shanghai Qi Zhi Institute AI Tower Xuhui District Shanghai200232 China

Complex lattices provide a versatile ground for fascinating quantum many-body physics. Here, we propose an exotic mechanics for generating orbital frustration in hexagonal lattices. We study two-component (pseudospin-1/2) Bose gases in p-orbital bands of two-dimensional hexagonal lattices, and find that the system exhibits previously untouched orbital frustration as a result of the interplay of spin and orbital degrees of freedom, in contrast to normal Ising-type orbital ordering of spinless porbital band bosons in two-dimensional hexagonal lattices. Based on the classification by symmetry analysis, we find the interplay of orbital frustration and strong interaction leads to exotic Mott and superfluid phases with spin-orbital intertwined orders, in spite of the complete absence of spin-orbital interaction in the Hamiltonian. Our study implies many-body correlations in a multi-orbital setting could induce rich spin-orbital intertwined physics in complex lattice structures. Copyright © 2021, The Authors. All rights reserved.

关键词： Bosons

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Constraining inflation with nonminimal derivative coupling with the Parkes Pulsar Timing Array third data release

arXiv

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arXiv 2024年

作者： Han, Chang Chen, Li-Yang Chen, Zu-Cheng Fu, Chengjie Wu, Puxun Yu, Hongwei Bhat, N.D. Ramesh Liu, Xiaojin Di Marco, Valentina Mishra, Saurav Reardon, Daniel J. Russell, Christopher J. Shannon, Ryan M. Zhang, Lei Zhu, Xingjiang Zic, Andrew Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Hunan Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Hunan Changsha410081 China College of Physics and Engineering Technology Chengdu Normal University Sichuan Chengdu611130 China Department of Physics Anhui Normal University Anhui Wuhu241002 China International Centre for Radio Astronomy Research Curtin University BentleyWA6102 Australia Department of Physics Faculty of Arts and Sciences Beijing Normal University Zhuhai519087 China School of Physics and Astronomy Monash University ClaytonVIC3800 Australia OzGrav: The ARC Center of Excellence for Gravitational Wave Discovery ClaytonVIC3800 Australia Australia Telescope National Facility CSIRO PO Box 76 EppingNSW1710 Australia Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 HawthornVIC3122 Australia OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery HawthornVIC3122 Australia CSIRO Scientific Computing Australian Technology Park Locked Bag 9013 AlexandriaNSW1435 Australia National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100101 China Institute for Frontier in Astronomy and Astrophysics Beijing Normal University Beijing102206 China

We study an inflation model with nonminimal derivative coupling that features a coupling between the derivative of the inflaton field and the Einstein tensor. This model naturally amplifies curvature perturbations at small scales via gravitationally enhanced friction, a mechanism critical for the formation of primordial black holes and the associated production of potentially detectable scalar-induced gravitational waves. We derive analytical expressions for the primordial power spectrum, enabling efficient exploration of the model parameter space without requiring computationally intensive numerical solutions of the Mukhanov-Sasaki equation. Using the third data release of the Parkes Pulsar Timing Array (PPTA DR3), we constrain the model parameters characterizing the coupling function: c = 3.7+0−035MP, log10 ωL = 7.1+0−063, and log10 σ = −8.3+0−036 at 90% confidence level. Our results demonstrate the growing capability of pulsar timing arrays to probe early Universe physics, complementing traditional cosmic microwave background observations by providing unique constraints on inflationary dynamics at small scales. © 2024, CC BY.

关键词： Gravitational effects

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Tripartite Genuine Non-Gaussian Entanglement in Three-Mode Spontaneous Parametric Down-Conversion

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Physical Review Letters 2020年第2期125卷 020502-020502页

作者： A. Agustí C. W. Sandbo Chang F. Quijandría G. Johansson C. M. Wilson C. Sabín Instituto de Física Fundamental CSIC Serrano 113-bis 28006 Madrid Spain Institute for Quantum Computing and Electrical and Computer Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada Microtechnology and Nanoscience MC2 Chalmers University of Technology SE-412 96 Göteborg Sweden

We show that the states generated by a three-mode spontaneous parametric down-conversion (SPDC) interaction Hamiltonian possess tripartite entanglement of a different nature to other paradigmatic three-mode entangled states generated by the combination of two-mode SPDC interactions. While two-mode SPDC generates Gaussian states whose entanglement can be characterized by standard criteria based on two-mode quantum correlations, these criteria fail to capture the entanglement generated by three-mode SPDC. We use criteria built from three-mode correlation functions to show that the class of states recently generated in a superconducting-circuit implementation of three-mode SPDC ideally have tripartite entanglement, contrary to recent claims in the literature. These criteria are suitable for triple SPDC but we show that they fail to detect tripartite entanglement in other states which are known to possess it, which illustrates the existence of two fundamentally different notions of tripartite entanglement in three-mode continuous-variable systems.

关键词： Entanglement detection Optical parametric oscillators & amplifiers Photon pairs & parametric down-conversion quantum entanglement quantum states of light Squeezing of quantum noise

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Strain-induced in-plane anomalous Hall effect in single-crystalline Fe(211) films

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Physical Review B 2025年第17期111卷 174423-174423页

作者： Haoran Chen Yongwei Cui Tong Wu Yunzhuo Wu Ke Pei Yixuan Wang Yue Chen Hongyue Xu Renchao Che Zhe Yuan Cong Xiao Yizheng Wu Department of Physics Applied Surface Physics State Key Laboratory Fudan University Shanghai 200433 China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering and Technology Fudan University Shanghai 200438 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Interdisciplinary Center for Theoretical Physics and Information Science (ICTPIS) Fudan University Shanghai 200433 China Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China Shanghai Key Laboratory of Metasurfaces for Light Manipulation Fudan University Shanghai 200433 China

We present a systematic investigation of the in-plane anomalous Hall effect (IPAHE) induced by the in-plane magnetization in single-crystalline Fe(211) films epitaxially grown on MgO(110) substrates. A single-crystal domain in the Fe(211) films is well controlled using slightly miscut substrates, enabling precise observation of the IPAHE. A pronounced IPAHE is observed when the magnetization aligns along the Fe[1¯11] direction, with the in-plane anomalous Hall resistivity ρIPAH reaching its maximum value and showing independence from the current direction. This behavior aligns with phenomenological models dictated by crystalline symmetry and likely stems from epitaxial strain in the films. The scaling relationship between ρIPAH and the longitudinal resistivity across a range of temperatures and film thicknesses is systematically analyzed. A nonmonotonic temperature dependence of ρIPAH indicates a complex interplay between extrinsic and intrinsic mechanisms. Our study provides experimental insight into the mechanisms underlying IPAHE and highlights the potential for tailoring IPAHE through film thickness and strain engineering.

关键词： Magnetization

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Tuning dzyaloshinskii-moriya interaction in ferrimagnetic GdCo: A first principles approach

arXiv

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arXiv 2021年

作者： Morshed, Md Golam Khoo, Khoong Hong Quessab, Yassine Xu, Jun-Wen Laskowski, Robert Balachandran, Prasanna V. Kent, Andrew D. Ghosh, Avik W. Department of Electrical and Computer Engineering University of Virginia CharlottesvilleVA22904 United States Institute of High Performance Computing Agency for Science Technology and Research 1 Fusionopolis Way Connexis Singapore138632 Singapore Center for Quantum Phenomena Department of Physics New York University New YorkNY10003 United States Department of Materials Science and Engineering University of Virginia CharlottesvilleVA22904 United States Department of Mechanical and Aerospace Engineering University of Virginia CharlottesvilleVA22904 United States Department of Physics University of Virginia CharlottesvilleVA22904 United States

We present a systematic analysis of our ability to tune chiral Dzyaloshinskii-Moriya Interactions (DMI) in compensated ferrimagnetic Pt/GdCo/Pt1−xWx trilayers by cap layer composition. Using first principles calculations, we show that the DMI increases rapidly for only ∼ 10% W and saturates thereafter, in agreement with experiments. The calculated DMI shows a spread in values around the experimental mean, depending on the atomic configuration of the cap layer interface. The saturation is attributed to the vanishing of spin orbit coupling energy at the cap layer and the simultaneous constancy at the bottom interface. Additionally, we predict the DMI in Pt/GdCo/X (X = Ta, W, Ir) and find that W in the cap layer favors a higher DMI than Ta and Ir that can be attributed to the difference in d-band alignment around the Fermi level. Our results open up exciting combinatorial possibilities for controlling the DMI in ferrimagnets towards nucleating and manipulating ultrasmall high-speed skyrmions. Copyright © 2021, The Authors. All rights reserved.

关键词： Ferrimagnetism

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Analytic study of superradiant stability of Kerr-Newman black holes under charged massive scalar perturbation

arXiv

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arXiv 2020年

作者： Xu, Jun-Huai Zheng, Zi-Han Luo, Ming-Jian Huang, Jia-Hui School of Information and Optoelectronic Science and Technology South China Normal University Guangzhou510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication Engineering South China Normal University Guangzhou510006 China Guangdong Provincial Key Laboratory of Nuclear Science Institute of quantum matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China

The superradiant stability of a Kerr-Newman black hole and charged massive scalar perturbation is investigated. We treat the black hole as a background geometry and study the equation of motion of the scalar perturbation. From the radial equation of motion, we derive the effective potential experienced by the scalar perturbation. By a careful analysis of this effective potential, it is found that when the inner and outer horizons of Kerr-Newman black hole satisfy rr−+ 6 13 and the charge-to-mass ratios of scalar perturbation and black hole satisfy µqMQ > 1, the Kerr-Newman black hole and scalar perturbation system is superradiantly stable. © 2020, CC BY.

关键词： Equations of motion

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Tunable ferromagnetic Weyl fermions from a hybrid nodal ring

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npj Computational Materials 2019年第1期5卷 516-522页

作者： Baobing Zheng Bowen Xia Rui Wang Jinzhu Zhao Zhongjia Chen Yujun Zhao Hu Xu Department of Physics and Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology518055 ShenzhenP.R.China School of Physics and Technology Wuhan University430072 WuhanP.R.China College of Physics and Optoelectronic Technology and Advanced Titanium Alloys and Functional Coatings Cooperative Innovation Center Baoji University of Arts and Sciences721016 BaojiP.R.China Institute for Structure and Function and Department of physics Chongqing University400044 ChongqingP.R.China Department of Physics South China University of Technology510640 GuangzhouP.R.China Center for Quantum Computing Peng Cheng Laboratory518055 ShenzhenP.R.China

Realization of nontrivial band topology in condensed matter systems is of great interest in recent *** first-principles calculations and symmetry analysis,we propose an exotic topological phase with tunable ferromagnetic Weyl fermions in a halfmetallic oxide CrP_(2)O_(7).In the absence of spin–orbit coupling(SOC),we reveal that CrP_(2)O_(7) possesses a hybrid nodal *** SOC is present,the spin-rotation symmetry is *** a result,the hybrid nodal ring shrinks to discrete nodal points and forms different types of Weyl *** Fermi arcs projected on the(100)surface are clearly visible,which can contribute to the experimental study for the topological properties of CrP_(2)O_(7).In addition,the calculated quasiparticle interference patterns are also highly desirable for the experimental study of CrP_(2)O_(7).Our findings provide a good candidate of ferromagnetic Weyl semimetals,and are expected to realize related topological applications with their attracted features.

关键词： ferromagnetic nodal topological

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