Advanced Quantum Technologies

Abstract Rich nontrivial topological phases rooted in the interplay between magnetism and topology in the layered antiferromagnet EuCd 2 As 2 have captured vast attention, especially the ideal Weyl semimetal state realized in the spin‐polarized ferromagnetic (FM) structure driven by a moderate external magnetic field. In this work, combining magnetization, magneto‐transport, and structure measurements under high pressure and first principles calculations, this study finds that the pressure can drive the in‐plane antiferromagnetic structure of EuCd 2 As 2 across an intermediate in‐plane FM structure then into the out‐of‐plane FM structure. This study also finds butterfly‐shaped MR and anomalous Hall effect under large pressure, which may support the pressure‐driven FM state. High‐pressure angle‐dispersive X‐ray diffraction and X‐ray absorption near‐edge spectroscopy measurements exclude structure transition and/or change of Eu 2+ valence state as sources for the magnetic phase transitions. Alternatively, apparently reduced axial ratio ( c / a ) and compressed Eu‐layer space distance should play important roles. Interestingly, the calculations unveil that the out‐of‐plane FM structure hosts only one pair of Weyl nodes around the Fermi level, suggesting that pressure can be an alternative way to realize the ideal Weyl semimetal state in EuCd 2 As 2 and will be useful for exploring exotic topological properties in such layered magnetic topological phase with strongly competing magnetic exchanges.

Zhenhai Yu

Xuejiao Chen

Wei Xia

Ningning Wang

Xiaodong Lv

Desheng Wu

Wei Wu

Ziyi Liu

Jinggeng Zhao

Mingtao Li

Shujia Li

Xin Li

Zhaohui Dong

Chunyin Zhou

Lili Zhang

Xia Wang

Na Yu

Zhiqiang Zou

Jianlin Luo

Jinguang Cheng

Lin Wang

Zhicheng Zhong

Yanfeng Guo

Structure, Magnetotransport, and Theoretical Study on the Layered Antiferromagnet Topological Phase EuCd2As2 under High Pressure

高压下层状反铁磁拓扑相EuCd2As2的结构、磁输运及理论研究

Arindam Dutta

None Muskan

Subhashish Banerjee

Anirban Pathak

Back Cover: Analysis for Satellite‐Based High‐Dimensional Extended B92 and High‐Dimensional BB84 Quantum Key Distribution (Adv. Quantum Technol. 11/2024)

封底：基于卫星的高维扩展B92和高维BB84量子密钥分发分析（《先进量子技术》2024年11月刊）

Ali Pedram

Vira R. Besaga

Frank Setzpfandt

Özgür E. Müstecaplıoğlu

Inside Front Cover: Nonlocality Enhanced Precision in Quantum Polarimetry via Entangled Photons (Adv. Quantum Technol. 11/2024)

封面内页：通过纠缠光子实现量子偏振测量的非局域增强精度（《先进量子技术》2024年11月刊）

Ksenia Weber

Simon Thiele

Mario Hentschel

Alois Herkommer

Harald Giessen

Front Cover: Positional Accuracy of 3D Printed Quantum Emitter Fiber Couplers (Adv. Quantum Technol. 11/2024)

封面：3D打印量子发射器光纤耦合器的位置精度（《先进量子技术》2024年11月刊）

Abstract An approach for building quantum models based on the exponentially growing orthonormal basis of Hartley kernel functions is developed. First, a differentiable Hartley feature map parameterized by real‐valued argument that enables quantum models suitable for solving stochastic differential equations and regression problems is designed. Unlike the naturally complex Fourier encoding, the proposed Hartley feature map circuit leads to quantum states with real‐valued amplitudes, introducing an inductive bias and natural regularization. Next, a quantum Hartley transform circuit is proposed as a map between computational and Hartley basis. The developed paradigm is applied to generative modeling from solutions of stochastic differential equations, and utilize the quantum Hartley transform for fine sampling from parameterized distributions through an extended register. Finally, the capability of multivariate quantum generative modeling is demonstrated for both correlated and uncorrelated distributions. As a result, the developed quantum Hartley‐based generative models (QHGMs) offer a distinct quantum approach to generative AI at increasing scale.

Hsin‐Yu Wu

Vincent E. Elfving

Oleksandr Kyriienko

Multidimensional Quantum Generative Modeling by Quantum Hartley Transform

量子哈特利变换的多维量子生成建模

Abstract Combining the benefits of quantum computing and artificial neural networks, quantum reservoir computing shows potential for handling complex tasks due to its access to the Hilbert space in exponential dimensions. In this study, the quantum Fourier transform algorithm is implemented utilizing quantum reservoir computing, demonstrating its unique advantages. For the random interactions within the reservoirs, quantum reservoir computing avoids the cost of precise control of the physical system. The proposed model only requires to optimize a linear readout layer, thus significantly reducing the computational cost required for training. The accuracy of the implementation is numerically demonstrated and the model is integrated into quantum circuits to correctly execute the quantum phase estimation algorithm. Additionally, the impacts of different reservoir structures and dissipation intensities within the reservoir, and the results indicate the robustness of the model are discussed.

Lu‐Fan Zhang

Lu Liu

Xing‐yu Wu

Chuan Wang

Quantum Fourier Transformation Using Quantum Reservoir Computing Network

使用量子储备计算网络的量子傅里叶变换

Abstract Diverse exceptional points (EPs) are theoretically studied in an experimentally feasible magno‐optomechanics consisting of an optomechanical subsystem coupled to a magnomechanical subsystem via physically direct contact. By adiabatically eliminating both the cavity and the Kittel mode, dissipative and parity‐time symmetric exceptional points can be observed. When only the cavity mode is eliminated, a second (third)‐order pseudo‐Hermitian EP emerges for nondegenerate (degenerate) mechanical modes. The distinct dynamical behavior of two mechanical modes around these EPs are further studied. The proposal provides a promising way to engineer diverse EPs and quantify non‐Hermitian phase transition with exceptional dynamical behavior in magno‐optomechanics.

Wen‐Di He

Xiao‐Hong Fan

Ming‐Yue Liu

Guo‐Qiang Zhang

Hai‐Chao Li

Wei Xiong

Mechanical Dynamics Around Higher‐Order Exceptional Point in Magno‐Optomechanics

磁光力学中高阶异常点附近的机械动力学

Abstract The detection and certification of entanglement and quantum correlations in materials is of fundamental and far‐reaching importance, and has seen significant recent progress. It impacts both the understanding of the basic science of quantum many‐body phenomena as well as the identification of systems suitable for novel technologies. Frameworks suitable to condensed matter that connect measurements to entanglement and coherence have been developed in the context of quantum information theory. These take the form of entanglement witnesses and quantum correlation measures. The underlying theory of these quantities, their relation to condensed matter experimental techniques, and their application to real materials are comprehensively reviewed. In addition, their usage in, e.g., protocols, the relative advantages and disadvantages of witnesses and measures, and future prospects in, e.g., correlated electrons, entanglement dynamics, and entangled spectroscopic probes, are presented. Consideration is given to the interdisciplinary nature of this emerging research and substantial ongoing progress by providing an accessible and practical treatment from fundamentals to application. Particular emphasis is placed on quantities accessible to collective measurements, including by susceptibility and spectroscopic techniques. This includes the magnetic susceptibility witness, one‐tangle, concurrence and two‐tangle, two‐site quantum discord, and quantum coherence measures such as the quantum Fisher information.

Pontus Laurell

Allen Scheie

Elbio Dagotto

D. Alan Tennant

Witnessing Entanglement and Quantum Correlations in Condensed Matter: A Review

凝聚态物质中纠缠与量子关联的见证：综述

Abstract Proximity‐induced superconductivity in hybrid devices of topological insulators and superconductors offers a promising platform for the pursuit of elusive topological superconductivity and its anticipated applications, such as fault‐tolerant quantum computing. To study and harness such hybrid devices, a key challenge is the realization of highly functional material interfaces with a suitable superconductor featuring 2‐periodic parity‐conserving transport to ensure a superconducting hard‐gap free of unpaired electrons, which is important for Majorana physics. A superconductor well‐known for this characteristic is Al, however, its direct integration into devices based on tetradymite topological insulators has so far been found to yield non‐transparent interfaces. By focusing on Bi 2 Te 3 ‐Al heterostructures, this study identifies detrimental interdiffusion processes at the interface through atomically resolved structural and chemical analysis, and showcases their mitigation by leveraging different interlayers – namely Nb, Ti, Pd, and Pt – between Bi 2 Te 3 and Al. Through structural transformation of the interlayer materials (X) into their respective tellurides (XTe 2 ) atomically‐sharp epitaxial interfaces are engineered and further characterized in low‐temperature transport experiments on Al‐X‐Bi 2 Te 3 ‐X‐Al Josephson junctions and in complementary density functional theory calculations. By demonstrating functional interfaces between Bi 2 Te 3 and Al, this work provides key insights and paves the way for the next generation of sophisticated topological devices.

Abdur Rehman Jalil

Tobias W. Schmitt

Philipp Rüßmann

Xian‐Kui Wei

Benedikt Frohn

Michael Schleenvoigt

Wilhelm Wittl

Xiao Hou

Anne Schmidt

Kaycee Underwood

Gustav Bihlmayer

Martina Luysberg

Joachim Mayer

Stefan Blügel

Detlev Grützmacher

Peter Schüffelgen

Engineering Epitaxial Interfaces for Topological Insulator — Superconductor Hybrid Devices with Al Electrodes

工程外延界面用于拓扑绝缘体—超导体混合器件与铝电极

短名	Adv Quantum Tech
Journal Impact	4.42
国际分区	QUANTUM SCIENCE & TECHNOLOGY(Q2)
期刊索引	SCI Q1中科院 2 区

ISSN	2511-9044
h-index	33
国内分区	物理与天体物理(2区)物理与天体物理光学(3区)物理与天体物理量子科技(3区)

涉及主题	物理量子力学量子工程类计算机科学材料科学光学数学光电子学凝聚态物理化学电气工程量子计算机
出版信息	出版商: John Wiley & Sons Inc.，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 2018，原创研究文献占比: 79.55%，自引率:， Gold OA占比: 26.32%

Advanced Quantum Technologies

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Structure, Magnetotransport, and Theoretical Study on the Layered Antiferromagnet Topological Phase EuCd₂As₂ under High Pressure

Back Cover: Analysis for Satellite‐Based High‐Dimensional Extended B92 and High‐Dimensional BB84 Quantum Key Distribution (Adv. Quantum Technol. 11/2024)

Inside Front Cover: Nonlocality Enhanced Precision in Quantum Polarimetry via Entangled Photons (Adv. Quantum Technol. 11/2024)

Front Cover: Positional Accuracy of 3D Printed Quantum Emitter Fiber Couplers (Adv. Quantum Technol. 11/2024)

Multidimensional Quantum Generative Modeling by Quantum Hartley Transform

Quantum Fourier Transformation Using Quantum Reservoir Computing Network

Multidimensional Quantum Generative Modeling by Quantum Hartley Transform

Mechanical Dynamics Around Higher‐Order Exceptional Point in Magno‐Optomechanics

Witnessing Entanglement and Quantum Correlations in Condensed Matter: A Review

Engineering Epitaxial Interfaces for Topological Insulator — Superconductor Hybrid Devices with Al Electrodes