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The Three Hundred project hydrodynamical simulations: Hydrodynamical weak-lensing cluster mass biases and richnesses using different hydro models.

arXiv

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arXiv 2025年

作者： Giocoli, C. Despali, G. Meneghetti, M. Rasia, E. Moscardini, L. Borgani, S. Lesci, G.F. Marulli, F. Cui, W. Yepes, G. INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna Via Piero Gobetti 93/3 Bologna40129 Italy INFN – Sezione di Bologna viale Berti Pichat 6/2 BolognaI-40127 Italy Dipartimento di Fisica e Astronomia "Augusto Righi" Alma Mater Studiorum Università di Bologna via Gobetti 93/2 BolognaI-40129 Italy INAF – Osservatorio Astronomico di Trieste via Tiepolo 11 TriesteI-34131 Italy IFPU Institute for Fundamental Physics of the Universe Via Beirut 2 Trieste34014 Italy Department of Physics University of Michigan Ann ArborMI48109 United States Dipartimento di Fisica Università di Trieste Sez. di Astronomia via Tiepolo 11 TriesteI-34131 Italy ICSC - Italian Research Center on High Performance Computing Big Data and Quantum Computing via Magnanelli 2 Casalecchio di Reno40033 Italy INFN Instituto Nazionale di Fisica Nucleare Via Valerio 2 TriesteI-34127 Italy Departamento de Física Teórica Facultad de Ciencias Universidad Autónoma de Madrid Módulo 15 MadridE-28049 Spain Facultad de Ciencias Universidad Autónoma de Madrid MadridE-28049 Spain Institute for Astronomy University of Edinburgh Royal Observatory EdinburghEH9 3HJ United Kingdom

Context. The mass of galaxy clusters estimated from weak-lensing observations is affected by projection effects, leading to a systematic underestimation compared to the true cluster mass. This bias varies with both mass and redshift. Additionally, the magnitude of this bias depends on the criteria used to select clusters and the spatial scale over which their mass is measured. In this work, we leverage state-of-the-art hydrodynamical simulations of galaxy clusters carried out with GadgetX and GIZMO-SIMBA as part of the Three Hundred project. We used them to quantify weak-lensing mass biases with respect also to the results from dark matter-only simulations. We also investigate how the biases of the weak-lensing mass estimates propagate into the richness-mass relation. Aims. We aim to shed light on the effect of the presence of baryons on the weak-lensing mass bias and also whether this bias depends on the galaxy formation recipe;in addition, we seek to model the richness-mass relation that can be used as guidelines for observational experiments for cluster cosmology. Methods. We produced weak-lensing simulations of random projections to model the expected excess surface mass density profile of clusters up to redshift z = 1. We then estimated the observed richness by counting the number of galaxies in a cylinder with a radius equal to the cluster radius and correcting by large-scale projected contaminants. We adopted a Bayesian analysis to infer the weak lensing cluster mass and concentration. Results. We derived the weak-lensing mass-richness relation and found consistency within 1σ uncertainties across hydrodynamical simulations. The intercept parameter of the relation is independent of redshift but varies with the minimum of the stellar mass used to define the richness value. At the same time, the slope is described by a second-order polynomial in redshift, which is relatively constant up to z = 0.55. The scatter in observed richness at a fixed weak-lensing mass,

关键词： Dark Matter

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Helicity‐dependent THz emission induced by ultrafast spin photocurrent in nodal‐line semimetal candidate Mg3Bi2

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Opto-Electronic Advances 2020年第12期3卷 9-16页

作者： Mingyu Tong Yuze Hu Xiangnan Xie Xiegang Zhu Zhenyu Wang Xiang'ai Cheng Tian Jiang College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China National Innovation Institute of Defense Technology Academy of Military Sciences PLA ChinaBeijing 100010China State Key Laboratory of High Performance Computing College of ComputerNational University of Defense TechnologyChangsha 410073China Beijing Academy of Quantum Information Sciences Beijing 100193China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China

Helicity-dependent ultrafast spin current generated by circularly polarized photons in topological materials holds the crux to many technological improvements,such as quantum communications,on-chip communication processing and ***,we present the manipulation of helicity-dependent terahertz emission generated in a nodal line semimetal candidate Mg3Bi2 by using photon polarization *** terahertz emission is mainly ascribed to the helicity-dependent photocurrent that is originated from circular photogalvanic effects,and the helicity-independent photocurrent that is attributed to linear photogalvanic *** work will inspire more explorations into novel nodal line semimetals and open up new opportunities for developing ultrafast optoelectronics in the topological system.

关键词： terahertz spin photocurrent nodal-line semimetal topological material

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Raising the supremacy threshold for boson sampling by preventing sample loss

arXiv

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arXiv 2019年

作者： Liu, Yong Xiong, Min Wu, Chunqing Wang, Dongyang Liu, Yingwen Ding, Jiangfang Huang, Anqi Fu, Xiang Qiang, Xiaogang Xu, Ping Deng, Mingtang Yang, Xuejun Wu, Junjie Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China

It is promising to achieve quantum supremacy with boson sampling given the rapid development of physical implementations. However, the sample loss issue, which exists in both the physical experiments and classical simulation, has a strong impact on where the frontier of quantum supremacy is. Addressing this, we present Sample Caching Markov Chain Monte Carlo (SC-MCMC), a sampling method that can generate samples without loss. SC-MCMC can reduce the estimated time for a 50-photon sample in ∼10 days to Copyright © 2019, The Authors. All rights reserved.

关键词： Bosons

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Unveiling dark matter free streaming at the smallest scales with the high redshift Lyman-alpha forest

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Physical Review D 2024年第4期109卷 043511-043511页

作者： Vid Iršič Matteo Viel Martin G. Haehnelt James S. Bolton Margherita Molaro Ewald Puchwein Elisa Boera George D. Becker Prakash Gaikwad Laura C. Keating Girish Kulkarni Kavli Institute for Cosmology University of Cambridge Madingley Road Cambridge CB3 0HA United Kingdom Cavendish Laboratory University of Cambridge 19 J. J. Thomson Avenue Cambridge CB3 0HE United Kingdom SISSA—International School for Advanced Studies Via Bonomea 265 34136 Trieste Italy INFN—National Institute for Nuclear Physics Via Valerio 2 I-34127 Trieste Italy IFPU Institute for Fundamental Physics of the Universe via Beirut 2 34151 Trieste Italy INAF Osservatorio Astronomico di Trieste Via G. B. Tiepolo 11 I-34131 Trieste Italy ICSC—Centro Nazionale di Ricerca in High Performance Computing Big Data e Quantum Computing Via Magnanelli 2 Bologna Italy Institute of Astronomy University of Cambridge Madingley Road Cambridge CB3 0HA United Kingdom School of Physics and Astronomy University of Nottingham University Park Nottingham NG7 2RD United Kingdom Leibniz-Institut für Astrophysik Potsdam An der Sternwarte 16 14482 Potsdam Germany Department of Physics and Astronomy University of California Riverside California 92521 USA Max-Planck-Institut für Astronomie Königstuhl 17 D-69117 Heidelberg Germany Institute for Astronomy University of Edinburgh Blackford Hill Edinburgh EH9 3HJ United Kingdom Tata Institute of Fundamental Research Homi Bhabha Road Mumbai 400005 India

This study introduces novel constraints on the free streaming of thermal relic warm dark matter (WDM) from Lyman-α forest flux power spectra. Our analysis utilizes a high resolution, high redshift sample of quasar spectra observed using the HIRES and UVES spectrographs (z=4.2–5.0). We employ a Bayesian inference framework and a simulation-based likelihood that encompasses various parameters including the free streaming of dark matter, cosmological parameters, the thermal history of the intergalactic medium, and inhomogeneous reionization to establish lower limits on the mass of a thermal relic WDM particle of 5.7 keV (at 95% CL). This result surpasses previous limits from the Lyman-α forest through reduction of the measured uncertainties due to a larger statistical sample and by measuring clustering to smaller scales (kmax=0.2 km−1 s). The approximately two-fold improvement due to the expanded statistical sample suggests that the effectiveness of Lyman-α forest constraints on WDM models at high redshifts are limited by the availability of high quality quasar spectra. Restricting the analysis to comparable scales and thermal history priors as in prior studies (kmax<0.1 km−1 s) lowers the bound on the WDM mass to 4.1 keV. As the precision of the measurements increases, it becomes crucial to examine the instrumental and modeling systematics. On the modeling front, we argue that the impact of the thermal history uncertainty on the WDM particle mass constraint has diminished due to improved independent observations. At the smallest scales, the primary source of modeling systematic arises from the structure in the peculiar velocity of the intergalactic medium and inhomogeneous reionization.

关键词： Cosmology Dark matter Large scale structure of the Universe Particle dark matter Astrophysical & cosmological simulations

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Variational quantum circuits for quantum state tomography

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Physical Review A 2020年第5期101卷 052316-052316页

作者： Yong Liu Dongyang Wang Shichuan Xue Anqi Huang Xiang Fu Xiaogang Qiang Ping Xu He-Liang Huang Mingtang Deng Chu Guo Xuejun Yang Junjie Wu Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 China National Innovation Institute of Defense Technology AMS 100071 Beijing China Henan Key Laboratory of Quantum Information and Cryptography IEU Zhengzhou 450001 China Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei Anhui 230026 China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Quantum Intelligence Lab Supremacy Future Technologies Guangzhou 511340 China

quantum state tomography is a key process in most quantum experiments. In this work, we employ quantum machine learning for state tomography. Given an unknown quantum state, it can be learned by maximizing the fidelity between the output of a variational quantum circuit and this state. The number of parameters of the variational quantum circuit grows linearly with the number of qubits and the circuit depth, so that only polynomial measurements are required, even for highly entangled states. After that, a subsequent classical circuit simulator is used to transform the information of the target quantum state from the variational quantum circuit into a familiar format. We demonstrate our method by performing numerical simulations for the tomography of the ground state of a one-dimensional quantum spin chain, using a variational quantum circuit simulator. Our method is suitable for near-term quantum computing platforms, and could be used for relatively large-scale quantum state tomography for experimentally relevant quantum states.

关键词： Machine learning quantum algorithms quantum tomography

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Enhancement of optomechanically induced sum sidebands using parametric interactions

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Physical Review A 2019年第2期100卷 023838-023838页

作者： Wen-An Li Guang-Yao Huang School of Physics and Electronic Engineering Guangzhou University Guangzhou 510006 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 China

We theoretically study radiation pressure induced generation of the frequency components at the sum sideband in an optomechanical system containing an optical parametric amplifier (OPA). It is shown that an OPA inside a cavity can considerably enhance the amplitude of sum sideband even with low power input fields. We find a new matching condition for the upper sum sideband generation. The height and width of the new peak can be adjusted by the nonlinear gain of the OPA. Furthermore, the lower sum sideband generation can be enhanced with several orders of magnitude by tuning the nonlinear gain parameter and the phase of the field pumping the OPA. The enhanced sum sideband may have potential applications to the manipulation of light in an on-chip optomechanical device and the sensitive sensing for precision measurement in the weak optomechanical coupling regime.

关键词： high-order harmonic generation Optomechanics quantum optics

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Voltage Manipulation of Desired Magnetization Orientation in Multiferroic Nanomagnets

SSRN

引用

SSRN 2020年

作者： Liu, Jiahao Yang, Xiaokuo Hong, Dunhua Li, Cheng Xu, Nuo Yang, Binbin Fang, Liang Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Department of Basic Sciences Air Force Engineering University Xi’an710051 China School of Physics and Electronic Science Zhunyi Normal University Zhunyi563006 China

We report the pure voltage manipulation of the desired magnetization orientation of the multiferroic nanomagnet: through integrating spintronics and multiferroics, we investigate magnetostrictive elliptical two-step-shaped nanomagnets. A pair of electrodes is fabricated on the piezoelectric substrate to generate localized stress by applying voltage. Through the inverse magnetoelectric coupling, slightly inclined stress induces the magnetization of the nanomagnet to desired orientation at room temperature. Our method liberates the electrical manipulation of multiferroic nanomagnets from the strict requirements of the voltage waveform. The results can be effectively applied to electrical induced information storage and logic writing of low- energy-consumption spintronic devices. © 2020, The Authors. All rights reserved.

关键词： Nanomagnetics

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A DECONSTRUCTION OF METHODS TO DERIVE ONE-POINT LENSING STATISTICS

arXiv

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arXiv 2024年

作者： Alfradique, Viviane Castro, Tiago Marra, Valerio Quartin, Miguel Giocoli, Carlo Monaco, Pierluigi Instituto de Física Universidade Federal do Rio de Janeiro RJ Rio de Janeiro21941-972 Brazil Centro Brasileiro de Pesquisas Físicas Rua Dr. Xavier Sigaud 150 RJ Rio de Janeiro22290-180 Brazil INAF - Osservatorio Astronomico di Trieste via Tiepolo 11 TriesteI-34131 Italy INFN - Sezione di Trieste TriesteI-34100 Italy IFPU - Institute for Fundamental Physics of the Universe via Beirut 2 Trieste34151 Italy ICSC - Centro Nazionale di Ricerca in High Performance Computing Big Data e Quantum Computing Via Magnanelli 2 Bologna Italy Departamento de Física Universidade Federal do Espírito Santo ES Vitória29075-910 Brazil PPGCosmo Universidade Federal do Espírito Santo ES Vitória29075-910 Brazil Observatório do Valongo Universidade Federal do Rio de Janeiro RJ Rio de Janeiro20080-090 Brazil INAF - Osservatorio Astronomico di Bologna via Piero Gobetti 93/3 BolognaI-40129 Italy INFN Sezione di Bologna viale Berti Pichat 6/2 BolognaI-40127 Italy Università di Trieste Dipartimento di Fisica via Tiepolo 11 Trieste34143 Italy

Gravitational lensing is a crucial tool for exploring cosmic phenomena, providing insights into galaxy clustering, dark matter, and dark energy. Given the substantial computational demands of N-body simulations, approximate methods like PINOCCHIO and turboGL have been proposed as viable alternatives for simulating lensing probability density functions (PDFs). This paper evaluates these methods and their effectiveness across both weak and strong lensing regimes, with a focus in the context where baryonic effects are negligible. Our comparative analysis reveals that these methods are effective for applications where lensing is mild, such as the majority of sources of electromagnetic and gravitational waves. However, both PINOCCHIO and turboGL break down for large values of convergence and magnification due to their loss of accuracy in capturing small-scale nonlinear matter fields, owing to oversimplified assumptions about internal halo structures and reliance on perturbation theory. PINOCCHIO yields second-to-fourth moments of the lensing PDFs, which are 6-10% smaller than those resulting from N-body simulations in regimes where baryonic effects are minimal. These findings aim to inform future studies on gravitational lensing of point sources, which are increasingly relevant with upcoming supernova and gravitational wave datasets. © 2024, CC BY.

关键词： Probability density function

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Ultra-bright multiplexed energy-time entangled photon generation from lithium niobate on insulator chip

arXiv

引用

arXiv 2020年

作者： Xue, Guang-Tai Niu, Yun-Fei Liu, Xiaoyue Duan, Jia-Chen Chen, Wenjun Pan, Ying Jia, Kunpeng Wang, Xiaohan Liu, Hua-Ying Zhang, Yong Xu, Ping Zhao, Gang Cai, Xinlun Gong, Yan-Xiao Hu, Xiaopeng Xie, Zhenda Zhu, Shining National Laboratory of Solid State Microstructures School of Physics School of Electronic Science and Engineering College of Engineering and Applied Sciences Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-sen University Guangzhou510275 China Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computing National University of Defense Technology Changsha410073 China

high-flux entangled photon source is the key resource for quantum optical study and application. Here it is realized in a lithium niobate on isolator (LNOI) chip, with 2.79×1011 Hz/mW photon pair rate and 1.53×109 Hz/nm/mW spectral brightness. These data are boosted by over two orders of magnitude compared to existing technologies. A 130-nm broad bandwidth is engineered for 8-channel multiplexed energy-time entanglement. Harnessed by high-extinction frequency correlation and Franson interferences up to 99.17% visibility, such energy-time entanglement multiplexing further enhances high-flux data rate, and warrants broad applications in quantum information processing on a chip. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

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Experimental Evidence of Topological Surface States in Mg3Bi2 Films Grown by Molecular Beam Epitaxy

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Chinese Physics Letters 2019年第11期36卷 65-69页

作者： Tong Zhou Xie-Gang Zhu Mingyu Tong Yun Zhang Xue-Bing Luo Xiangnan Xie Wei Feng Qiuyun Chen Shiyong Tan Zhen-Yu Wang Tian Jiang Yuhua Tang Xin-Chun Lai Xuejun Yang State Key Laboratory of High Performance Computing College of ComputerNational University of Defense TechnologyChangsha 410073 Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908 National Innovation Institute of Defense Technology Academy of Military Sciences PLA ChinaBeijing 100010 Institute of Materials China Academy of Engineering PhysicsMianyang 621700 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073 Academy of Military Sciences PLA China Beijing 100010 Beijing Academy of Quantum Information Sciences Beijing 100084

Nodal line semimetal(NLS) is a new quantum state hosting one-dimensional closed loops formed by the crossing of two bands. The so-called type-Ⅱ NLS means that these two crossing bands have the same sign in their slopes along the radial direction of the loop, which requires that the crossing bands are either right-tilted or left-tilted at the same time. According to the theoretical prediction, Mg3Bi2 is an ideal candidate for studying the type-Ⅱ NLS by tuning its spin-orbit coupling(SOC). high-quality Mg3 Bi2 films are grown by molecular beam epitaxy(MBE). By in-situ angle resolved photoemission spectroscopy(ARPES), a pair of surface resonance bands around theГ point are clearly seen. This shows that Mg3Bi2 films grown by MBE are Mg(1)-terminated by comparing the ARPES spectra with the first principles calculations results. Moreover, the temperature dependent weak anti-localization effect in Mg3Bi2 films is observed under magneto-transport measurements, which shows clear two-dimensional(2 D) e-e scattering characteristics by fitting with the Hikami–Larkin–Nagaoka model. Therefore, by combining with ARPES, magneto-transport measurements and the first principles calculations, this work proves that Mg3Bi2 is a semimetal with topological surface states. This paves the way for Mg3Bi2 to be used as an ideal material platform to study the exotic features of type-Ⅱ nodal line semimetals and the topological phase transition by tuning its SOC.

关键词： bands topological terminated

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