Nonreciprocal quantum batteries offer superior charging performance compared to reciprocal quantum batteries. We consider a charger-battery system comprising two optical cavities that interact independently with a third auxiliary cavity. We show that the nonzero dissipation of the auxiliary cavity induces a nonreciprocal exchange of excitations among the charger-battery system. Therefore, by engineering the loss in the auxiliary cavity, we induce a directional energy flow that enhances the charging efficiency. Using numerical and analytical calculations, we show that the steady-state energy stored in the battery significantly exceeds that in the charger. We compare our results with those of the reciprocal cases and demonstrate that our nonreciprocal quantum battery model exhibits a significant charging advantage. We believe that our proposed scheme represents a step forward in cavity-loss engineering, making it a viable approach for nonreciprocal quantum batteries with existing experimental techniques.
{"title":"Loss-Induced Nonreciprocal Quantum Battery","authors":"Muhammad Zaeem Zafar, Muhammad Irfan","doi":"10.1002/qute.202500845","DOIUrl":"https://doi.org/10.1002/qute.202500845","url":null,"abstract":"<div>\u0000 \u0000 <p>Nonreciprocal quantum batteries offer superior charging performance compared to reciprocal quantum batteries. We consider a charger-battery system comprising two optical cavities that interact independently with a third auxiliary cavity. We show that the nonzero dissipation of the auxiliary cavity induces a nonreciprocal exchange of excitations among the charger-battery system. Therefore, by engineering the loss in the auxiliary cavity, we induce a directional energy flow that enhances the charging efficiency. Using numerical and analytical calculations, we show that the steady-state energy stored in the battery significantly exceeds that in the charger. We compare our results with those of the reciprocal cases and demonstrate that our nonreciprocal quantum battery model exhibits a significant charging advantage. We believe that our proposed scheme represents a step forward in cavity-loss engineering, making it a viable approach for nonreciprocal quantum batteries with existing experimental techniques.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 2","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146139191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
<div> <p>Multipartite entanglement is widely recognized as a fundamental resource for various quantum protocols, including those in quantum communication and quantum computing. However, a unified characterization of multipartite entanglement remains elusive. In this paper, we introduce <span></span><math> <semantics> <mi>q</mi> <annotation>$q$</annotation> </semantics></math>-Concentratable Entanglements, a one-parameter family of measures for multipartite entanglement. This framework generalizes the Concentratable Entanglements framework, recovering the original measure at the limit of <span></span><math> <semantics> <mrow> <mi>q</mi> <mo>=</mo> <mn>2</mn> </mrow> <annotation>$q=2$</annotation> </semantics></math>. We prove that <span></span><math> <semantics> <mi>q</mi> <annotation>$q$</annotation> </semantics></math>-Concentratable Entanglements is a valid entanglement measure satisfying local operations and classical communication monotonicity and continuity. While linear cluster states are known to exhibit higher concentratable entanglements than Greenberger-Horne-Zeilinger (GHZ) states at the specific point <span></span><math> <semantics> <mrow> <mi>q</mi> <mo>=</mo> <mn>2</mn> </mrow> <annotation>$q=2$</annotation> </semantics></math>, To demonstrate the versatility of the <span></span><math> <semantics> <mi>q</mi> <annotation>$q$</annotation> </semantics></math>-Concentratable Entanglements framework, we performed a comprehensive analysis of several paradigmatic multipartite states. Our comparison of <span></span><math> <semantics> <mi>N</mi> <annotation>$N$</annotation> </semantics></math>-qubit GHZ and W states shows that the measure can distinguish them well, while the investigation of the 4-partite star network illustrates the role of <span></span><math> <semantics> <mi>q</mi> <annotation>$q$</annotation> </semantics></math> as a tunable parameter for probing structural subtleties. Most significantly, by analyzing the 4-qubit linear cluster state (<span></span><math> <semantics> <mrow> <mrow> <mo>|</mo> </mrow> <msub> <mi>C</mi> <mn>4</mn> </msub> <mrow> <mo>⟩</mo> </mrow> </mrow> <annotation>$mathinner {|{C_4}rangle }$</annotation> </semantics></math>)
{"title":"Family of One-Parameter Multipartite Entanglement Measures","authors":"Hang Ren, Yongming Li, Yu Luo","doi":"10.1002/qute.202500617","DOIUrl":"https://doi.org/10.1002/qute.202500617","url":null,"abstract":"<div>\u0000 \u0000 <p>Multipartite entanglement is widely recognized as a fundamental resource for various quantum protocols, including those in quantum communication and quantum computing. However, a unified characterization of multipartite entanglement remains elusive. In this paper, we introduce <span></span><math>\u0000 <semantics>\u0000 <mi>q</mi>\u0000 <annotation>$q$</annotation>\u0000 </semantics></math>-Concentratable Entanglements, a one-parameter family of measures for multipartite entanglement. This framework generalizes the Concentratable Entanglements framework, recovering the original measure at the limit of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>q</mi>\u0000 <mo>=</mo>\u0000 <mn>2</mn>\u0000 </mrow>\u0000 <annotation>$q=2$</annotation>\u0000 </semantics></math>. We prove that <span></span><math>\u0000 <semantics>\u0000 <mi>q</mi>\u0000 <annotation>$q$</annotation>\u0000 </semantics></math>-Concentratable Entanglements is a valid entanglement measure satisfying local operations and classical communication monotonicity and continuity. While linear cluster states are known to exhibit higher concentratable entanglements than Greenberger-Horne-Zeilinger (GHZ) states at the specific point <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>q</mi>\u0000 <mo>=</mo>\u0000 <mn>2</mn>\u0000 </mrow>\u0000 <annotation>$q=2$</annotation>\u0000 </semantics></math>, To demonstrate the versatility of the <span></span><math>\u0000 <semantics>\u0000 <mi>q</mi>\u0000 <annotation>$q$</annotation>\u0000 </semantics></math>-Concentratable Entanglements framework, we performed a comprehensive analysis of several paradigmatic multipartite states. Our comparison of <span></span><math>\u0000 <semantics>\u0000 <mi>N</mi>\u0000 <annotation>$N$</annotation>\u0000 </semantics></math>-qubit GHZ and W states shows that the measure can distinguish them well, while the investigation of the 4-partite star network illustrates the role of <span></span><math>\u0000 <semantics>\u0000 <mi>q</mi>\u0000 <annotation>$q$</annotation>\u0000 </semantics></math> as a tunable parameter for probing structural subtleties. Most significantly, by analyzing the 4-qubit linear cluster state (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mrow>\u0000 <mo>|</mo>\u0000 </mrow>\u0000 <msub>\u0000 <mi>C</mi>\u0000 <mn>4</mn>\u0000 </msub>\u0000 <mrow>\u0000 <mo>⟩</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$mathinner {|{C_4}rangle }$</annotation>\u0000 </semantics></math>) ","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 2","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146139186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Superconducting quantum interference devices (SQUIDs), as the most sensitive solid-state magnetic sensors currently available, play a crucial role in both fundamental science and industrial applications. This review systematically examines the research progress in high-temperature superconducting (HTS) SQUID magnetometers and gradiometers and their possible applications of SQUIDs. By detailing the working principles of DC and RF SQUIDs and reviewing advancements in critical system components—such as sensing elements, cryogenics, and readout electronics—this work lays a solid theoretical and structural foundation for ultra-sensitive magnetic sensing. Furthermore, by describing the properties of various HTS Josephson junctions, their flexibility, and critical points, we aim at highlighting the uniqueness of certain features and the possibility of tuning a variety of physical processes in these junctions. Additionally, it comprehensively summarizes innovative applications in biomedical imaging, geophysical exploration, and industrial non-destructive testing. The innovation of this review lies in constructing a developmental framework for HTS SQUID technology from a complete chain perspective of principles-devices-fabrication processes-applications, providing systematic technical references for researchers in related fields, which has important guiding significance for promoting the practical application of quantum sensing technology.
{"title":"High-Temperature Superconducting SQUIDs: From Principles and Fabrication to Applications - A Comprehensive Review","authors":"Ruonan Wang, Xinmin Shi, Bingke Xiang, Jianxin Lin, Xudong Cai, Zhiqiang Cao, Xueying Zhang, Xiaoyang Lin","doi":"10.1002/qute.202500595","DOIUrl":"https://doi.org/10.1002/qute.202500595","url":null,"abstract":"<div>\u0000 \u0000 <p>Superconducting quantum interference devices (SQUIDs), as the most sensitive solid-state magnetic sensors currently available, play a crucial role in both fundamental science and industrial applications. This review systematically examines the research progress in high-temperature superconducting (HTS) SQUID magnetometers and gradiometers and their possible applications of SQUIDs. By detailing the working principles of DC and RF SQUIDs and reviewing advancements in critical system components—such as sensing elements, cryogenics, and readout electronics—this work lays a solid theoretical and structural foundation for ultra-sensitive magnetic sensing. Furthermore, by describing the properties of various HTS Josephson junctions, their flexibility, and critical points, we aim at highlighting the uniqueness of certain features and the possibility of tuning a variety of physical processes in these junctions. Additionally, it comprehensively summarizes innovative applications in biomedical imaging, geophysical exploration, and industrial non-destructive testing. The innovation of this review lies in constructing a developmental framework for HTS SQUID technology from a complete chain perspective of principles-devices-fabrication processes-applications, providing systematic technical references for researchers in related fields, which has important guiding significance for promoting the practical application of quantum sensing technology.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 2","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146139190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Quantum entanglement is a crucial resource in quantum information science, applying to quantum key distribution, quantum sensing, and quantum teleportation. However, generating macroscopic quantum entanglement in multimode optomechanical systems, where an optical mode couples to multiple degenerate or near-degenerate vibrational modes, is a challenging task, as the entanglement is suppressed by the dark-mode effect. In this paper, we propose a scheme to generate both bipartite and genuine tripartite entanglement in the system via periodic modulation. First, we consider a two-oscillator optomechanical system in which time-varying voltages applied to the oscillators enable the engineering of coupling pathways between the bright and dark modes, thus breaking the dark-mode effect. Thermal phonons can be extracted by the coupling channels, so that bipartite and tripartite entanglement can be achieved at a nonzero temperature. Furthermore, we extend this scheme to an optomechanical system with oscillators, where the degenerate vibrational modes can entangle with the optical mode. Notably, the macroscopic quantum entanglement we obtain exhibits greater robustness against thermal phonons.
{"title":"Generation of Quantum Entanglement in a Multimode Cavity-Optomechanical System via Periodic Modulation","authors":"Zhen Yang, He Cheng, Xiao-Li Huang, Shu-Min Wu","doi":"10.1002/qute.202500918","DOIUrl":"https://doi.org/10.1002/qute.202500918","url":null,"abstract":"<div>\u0000 \u0000 <p>Quantum entanglement is a crucial resource in quantum information science, applying to quantum key distribution, quantum sensing, and quantum teleportation. However, generating macroscopic quantum entanglement in multimode optomechanical systems, where an optical mode couples to multiple degenerate or near-degenerate vibrational modes, is a challenging task, as the entanglement is suppressed by the dark-mode effect. In this paper, we propose a scheme to generate both bipartite and <i>genuine</i> tripartite entanglement in the system via periodic modulation. First, we consider a two-oscillator optomechanical system in which time-varying voltages applied to the oscillators enable the engineering of coupling pathways between the bright and dark modes, thus breaking the dark-mode effect. Thermal phonons can be extracted by the coupling channels, so that bipartite and tripartite entanglement can be achieved at a nonzero temperature. Furthermore, we extend this scheme to an optomechanical system with <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>N</mi>\u0000 <mo>≥</mo>\u0000 <mn>3</mn>\u0000 </mrow>\u0000 <annotation>$Nge 3$</annotation>\u0000 </semantics></math> oscillators, where the degenerate vibrational modes can entangle with the optical mode. Notably, the macroscopic quantum entanglement we obtain exhibits greater robustness against thermal phonons.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 2","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146139490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Magnetic skyrmionic stray fields are functionalizable to trigger, maintain, and steer quantum entanglement in a coupled chain of localized spins. This is demonstrated by an exact-diagonalization-based study of the ground state and non-equilibrium entanglement dynamics. The topology of the magnetic skyrmion is shown to be an essential ingredient. Ground state analysis of spins that are coupled locally to a skyrmionic texture and a global bias magnetic field reveals the existence of strongly and weakly entangled quantum phases with the entanglement being confined to the center of the magnetic texture. For quantum signal transmission, the entanglement dynamics of a magnonic excitation injected at one end of the quantum spin chain is obtained. Scattering is found to generate additional entanglement that is externally controllable by skyrmion and bias fields. In particular, the results illustrate a strong amplification of transmission of correlations by a pre-entangled initial state. The analysis uncovers the possibility of a resonator setup of two skyrmionic textures which is capable of generating a long-range entangled steady state after a single injected magnon is scattered by the textures. The findings point to the potential of classical non-trivial magnetic textures as a generator and driver for quantum entanglement.
{"title":"Magnon-Mediated Long-Range Entanglement in a Spin-1/2 Heisenberg Chain Coupled to Magnetic Skyrmions","authors":"Marius Melz, Jamal Berakdar","doi":"10.1002/qute.202500869","DOIUrl":"https://doi.org/10.1002/qute.202500869","url":null,"abstract":"<p>Magnetic skyrmionic stray fields are functionalizable to trigger, maintain, and steer quantum entanglement in a coupled chain of localized spins. This is demonstrated by an exact-diagonalization-based study of the ground state and non-equilibrium entanglement dynamics. The topology of the magnetic skyrmion is shown to be an essential ingredient. Ground state analysis of spins that are coupled locally to a skyrmionic texture and a global bias magnetic field reveals the existence of strongly and weakly entangled quantum phases with the entanglement being confined to the center of the magnetic texture. For quantum signal transmission, the entanglement dynamics of a magnonic excitation injected at one end of the quantum spin chain is obtained. Scattering is found to generate additional entanglement that is externally controllable by skyrmion and bias fields. In particular, the results illustrate a strong amplification of transmission of correlations by a pre-entangled initial state. The analysis uncovers the possibility of a resonator setup of two skyrmionic textures which is capable of generating a long-range entangled steady state after a single injected magnon is scattered by the textures. The findings point to the potential of classical non-trivial magnetic textures as a generator and driver for quantum entanglement.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 2","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202500869","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Hyperband-QNN algorithm achieves adaptive customization of quantum neural network structure by skilfully integrating the essence of neural networks and the Hyperband optimization algorithm, perfectly matching the needs of various specific tasks. This groundbreaking method not only opens up a new path for the design of quantum neural networks but also sets a model for the deep integration of quantum computing and traditional computing. More in article number 2400178, Zheng Shan and co-workers.
{"title":"Front Cover: Intelligent Generative Models for Quantum Neural Networks (Adv. Quantum Technol. 12/2025)","authors":"Xiaodong Ding, Qibing Xiong, Jinchen Xu, Fudong Liu, Junling Qiu, Yu Zhu, Yifan Hou, Zheng Shan","doi":"10.1002/qute.70124","DOIUrl":"https://doi.org/10.1002/qute.70124","url":null,"abstract":"<p>The Hyperband-QNN algorithm achieves adaptive customization of quantum neural network structure by skilfully integrating the essence of neural networks and the Hyperband optimization algorithm, perfectly matching the needs of various specific tasks. This groundbreaking method not only opens up a new path for the design of quantum neural networks but also sets a model for the deep integration of quantum computing and traditional computing. More in article number 2400178, Zheng Shan and co-workers.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 12","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70124","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Quantum-noise-driven diffusion models are proposed here as a novel class of quantum generative AI algorithms. These models aim to exploit the intrinsic noise of currently available quantum processing units, not as an issue to be solved by quantum error mitigation and correction, but instead as a beneficial resource to generate artificial, classical or quantum, data sampled from some unknown and usually very complex probability distribution that could be difficult or even impossible to sample from via classical computers. More in article number 2300401, Filippo Caruso and co-workers.
{"title":"Back Cover: Quantum-Noise-Driven Generative Diffusion Models (Adv. Quantum Technol. 12/2025)","authors":"Marco Parigi, Stefano Martina, Filippo Caruso","doi":"10.1002/qute.70122","DOIUrl":"https://doi.org/10.1002/qute.70122","url":null,"abstract":"<p>Quantum-noise-driven diffusion models are proposed here as a novel class of quantum generative AI algorithms. These models aim to exploit the intrinsic noise of currently available quantum processing units, not as an issue to be solved by quantum error mitigation and correction, but instead as a beneficial resource to generate artificial, classical or quantum, data sampled from some unknown and usually very complex probability distribution that could be difficult or even impossible to sample from via classical computers. More in article number 2300401, Filippo Caruso and co-workers.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 12","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70122","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In article number 2400603, Alexey Melnikov and co-workers present a method to enhance the generalization capability of quantum machine learning models through controllable noise regularization. The cover visualizes a quantum circuit in which quantum gates are interleaved with engineered noise channels of tunable strength λ. This structured injection of noise acts as an implicit regularizer, stabilizing the training process and improving the model's predictive performance on previously unseen data.
{"title":"Inside Back Cover: Method for Noise-Induced Regularization in Quantum Neural Networks (Adv. Quantum Technol. 12/2025)","authors":"Viacheslav Kuzmin, Wilfrid Somogyi, Ekaterina Pankovets, Alexey Melnikov","doi":"10.1002/qute.70153","DOIUrl":"https://doi.org/10.1002/qute.70153","url":null,"abstract":"<p>In article number 2400603, Alexey Melnikov and co-workers present a method to enhance the generalization capability of quantum machine learning models through controllable noise regularization. The cover visualizes a quantum circuit in which quantum gates are interleaved with engineered noise channels of tunable strength λ. This structured injection of noise acts as an implicit regularizer, stabilizing the training process and improving the model's predictive performance on previously unseen data.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 12","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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