Advanced quantum technologies最新文献

{"title":"Lightweight Quantum Convolutional Neural Networks via U(1)-Equivariant Kernels and Information-Guided Pooling","authors":"Xianmin Wang,&nbsp;Jing Li,&nbsp;Zhihan Zhuo","doi":"10.1002/qute.70415","DOIUrl":"https://doi.org/10.1002/qute.70415","url":null,"abstract":"<div>\u0000 \u0000 <p>While Quantum Convolutional Neural Networks (QCNNs) offer a structured framework for data processing in the noisy intermediate-scale quantum (NISQ) regime, conventional architectures often rely on over-parameterized ansätze that hinder trainability and increase sensitivity to hardware noise. Furthermore, standard quantum pooling strategies frequently discard useful coherent correlations. To address these limitations, we propose a parameter-efficient QCNN architecture integrating a <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>U</mi>\u0000 <mo>(</mo>\u0000 <mn>1</mn>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$U(1)$</annotation>\u0000 </semantics></math>-equivariant convolutional (<b>Eq-Conv</b>) kernel with a guided variational pooling (<b>Guided Var-Pool</b>) scheme. By enforcing continuous <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>U</mi>\u0000 <mo>(</mo>\u0000 <mn>1</mn>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$U(1)$</annotation>\u0000 </semantics></math> symmetry via Schur's Lemma, the Eq-Conv kernel requires only five trainable parameters, significantly reducing circuit complexity compared to full-rank <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>S</mi>\u0000 <mi>U</mi>\u0000 <mo>(</mo>\u0000 <mn>4</mn>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$SU(4)$</annotation>\u0000 </semantics></math> operations while maintaining competitive expressivity. For dimensionality reduction, the Guided Var-Pool introduces an Information-Bottleneck-inspired penalty that actively drives discarded qubits toward the ground state, ensuring task-relevant features are concentrated within the retained subsystem prior to truncation. To maintain NISQ compatibility, the architecture strictly adheres to the Principle of Deferred Measurement, eliminating the need for mid-circuit measurements. Numerical experiments on MNIST and Fashion-MNIST datasets demonstrate that our approach achieves competitive classification accuracy while exhibiting superior robustness against depolarizing noise. Compared to over-parameterized baselines, the proposed model establishes a favorable depth-for-robustness trade-off, providing a resource-efficient pathway for scalable quantum machine learning.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856696","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}

{"title":"Non-Hermitian Photon-Phonon Quantization Evolution Controlled by QWP Polarization Phase in Sm3+: BiPO4","authors":"Sehrish Aslam,&nbsp;Usman Javed,&nbsp;Fiza Latif,&nbsp;Hamza Javaid,&nbsp;Izhar Hussain,&nbsp;Yin Cai,&nbsp;Yanpeng Zhang","doi":"10.1002/qute.70423","DOIUrl":"https://doi.org/10.1002/qute.70423","url":null,"abstract":"<div>\u0000 \u0000 <p>Non-Hermitian quantum dynamics provide powerful approaches for controlling gain and loss in open quantum systems. However, experimental methods for tuning non-Hermitian quantization remain limited. In this work, we investigate the evolution of non-Hermitian photon–phonon dressed-state quantization in Sm³⁺: BiPO₄ controlled by the polarization-dressing phase using a quarter-wave plate (QWP). We observed three types of destructive and constructive switching behavior, governed by the initial phase and determined by the competition between photon-dressing Rabi frequency and dephasing rate. By continuously tuning the polarization phase, destructive quantization appears when the dephasing rate is dominant, whereas constructive quantization is stabilized by the photon Rabi frequency. These regimes exhibit discrete optical jumps, Landau-like step-level macroscopic quantization, and exceptional-point switching between correlated states. Lower excitation power further enhances polarization-controlled dressing quantization because of the larger dephasing rate. These results establish polarization phase as an effective control parameter for non-Hermitian quantum jumps and macroscopic quantization, opening new possibilities for optical switching and quantum memory applications.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856753","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}

{"title":"Crystal Anisotropy Implications on the Magneto-Optical Properties of van der Waals FePS3","authors":"Ellenor Geraffy,&nbsp;Kusha Sharma,&nbsp;Shahar Zuri,&nbsp;Faris Horani,&nbsp;Adam K. Budniak,&nbsp;Muhamed Dawod,&nbsp;Yaron Amouyal,&nbsp;Thomas Brumme,&nbsp;Andrea Maricel León,&nbsp;Thomas Heine,&nbsp;Rajesh Kumar,&nbsp;Doron Naveh,&nbsp;Efrat Lifshitz","doi":"10.1002/qute.70434","DOIUrl":"https://doi.org/10.1002/qute.70434","url":null,"abstract":"<p>Antiferromagnetic FePS₃ has recently gained significant interest in its potential applications in spin-related devices. Here, we show that in-plane structural anisotropy has a major impact in shaping the optical responses of FePS₃ single-crystals from the bulk form down to the monolayer limit. X-ray diffraction on a bulk FePS₃ crystal confirms a distorted FeS₆ octahedron causing inequivalent Fe-Fe distances and consequently resulting in a higher a/b lattice parameter ratio. Micro-photoluminescence observations on bulk and monolayer FePS₃ reveal four emissions: one intra-atomic <i>d-d</i> transition (band A, centered at ∼1.24 eV) and three <i>p-d</i> charge transfer transitions (bands B, C, and D, centered around ∼1.79, ∼2.3, and ∼2.56 eV, respectively). These bands exhibit different polarization behaviors, which persist down to the monolayer limit. Density functional theory calculations from bulk to monolayer FePS₃ reveal the underlying electronic structure, assign the observed emissions, and indicate why these peaks have contrasting linear and circular polarization responses. These results establish a direct structure-optics relation in FePS₃, highlighting the strong coupling between lattice anisotropy, electronic transitions, and symmetry-selective optical selection rules.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70434","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856756","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}

{"title":"Squeezed-State Semi-Device-Independent Quantum Randomness Generation","authors":"Hamid Tebyanian","doi":"10.1002/qute.70429","DOIUrl":"https://doi.org/10.1002/qute.70429","url":null,"abstract":"<p>This paper investigates semi-device-independent quantum randomness generation with a trusted binary pure-state source and an untrusted binary detector whose side information is classical. We derive a closed-form Shannon-rate expression, depending only on the trusted Gram overlap of the two source states and the observed symmetric error probability. The full binary-qubit positive operator-valued measure (POVM) optimization must include the two deterministic extreme points omitted by the projective-only treatment; including them gives a substantially lower, and correct, certified rate. The closed form is an unconditional upper bound on the certified asymptotic independent and identically distributed (i.i.d.) Shannon rate, and becomes tight on a numerically verified dual-feasibility region; it is the certified rate only inside this region; values beyond it are bounded numerically. We then apply the result to squeezed-coherent binary phase-shift keying (BPSK) sources, showing how squeezing changes the trade-off between state distinguishability and certified randomness in the lossless and lossy regimes. At fixed mean photon number and squeezing, the certified rate is largest when the displacement lies along the anti-squeezed quadrature, and we obtain the corresponding limiting value. An adversary holding a detector-purification register that tags the outcome lies outside the classical-side-information model and would reduce the certified rate to zero.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70429","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856754","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}

{"title":"The State of the Art in Satellite Quantum Key Distribution: Protocols, Technologies, and Physical Limits","authors":"F. Adria Sancho González,&nbsp;Satyendra Kumar Mishra,&nbsp;Harshit Tiwari","doi":"10.1002/qute.70416","DOIUrl":"https://doi.org/10.1002/qute.70416","url":null,"abstract":"<div>\u0000 \u0000 <p>This review presents the state of the art in quantum key distribution (QKD) for satellite-to-ground free-space optical links. It first surveys continuous-variable, discrete-variable, entanglement-based, measurement-device-independent, and twin-field protocols, and discusses their feasibility under the losses and time-varying conditions of orbital passes. It also distinguishes protocol security from practical implementation security. The paper then reviews enabling technologies, including single-photon sources and detectors, followed by atmospheric impairments, time-evolving turbulence, aperture averaging, and adaptive optics. Finally, physical channel limits and the trust assumptions of satellite-network architectures are discussed. Overall, the literature indicates that discrete-variable decoy-state BB84 in LEO downlink configurations is the most mature near-term SatQKD option, including for daylight operation when appropriate filtering and pointing/turbulence mitigation are employed.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856758","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}

{"title":"Finite-Time Protocols Stabilize Charging in Noisy Ising Quantum Batteries","authors":"Riccardo Grazi,&nbsp;Henrik Johannesson,&nbsp;Dario Ferraro,&nbsp;Niccolò Traverso Ziani","doi":"10.1002/qute.70419","DOIUrl":"https://doi.org/10.1002/qute.70419","url":null,"abstract":"<p>Reliable charging protocols are crucial for advancing quantum batteries toward practical use. We investigate a transverse-field Ising chain as a quantum battery, focusing on the combined role of qubit interactions in the battery model and finite charging time. This interplay yields smoother and more controllable charging compared to sudden protocols or non-interacting batteries. Introducing stochastic noise reveals a strong dependence on the charging trajectory. Protocols that weakly excite the system gain energy under noise but lose extractable work. In contrast, protocols that strongly excite many modes show the opposite trend: noise reduces stored energy yet improves efficiency, defined as the ratio of ergotropy to stored energy. These findings demonstrate that finite-time ramps stabilize charging and highlight that noise can either hinder or enhance quantum-battery performance depending on the protocol.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70419","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856751","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}

{"title":"Issue Information (Adv. Quantum Technol. 9/2026)","authors":"","doi":"10.1002/qute.70454","DOIUrl":"https://doi.org/10.1002/qute.70454","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.70454","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856694","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}

{"title":"Quantum-Squeezing-Enabled Acceleration of Dark Matter Axion Searches in Cavity Magnonics","authors":"Ya-long Ren,&nbsp;Rong-teng Cao,&nbsp;Ji-kun Xie,&nbsp;Sheng-li Ma,&nbsp;Fu-li Li,&nbsp;Peng-bo Li","doi":"10.1002/qute.70417","DOIUrl":"https://doi.org/10.1002/qute.70417","url":null,"abstract":"<div>\u0000 \u0000 <p>Quantum squeezing serves as a key nonclassical resource in quantum precision measurement and sensing. In magnon-based axion detector (i.e., a ferromagnetic haloscope), quantum uncertainty manifests as a fundamental noise source, limiting the scan rate necessary for a comprehensive search of axion parameter space. Here, we propose a scheme to accelerate the scan rate of the axion ferromagnetic haloscope via quantum squeezing. We consider a coupled cavity-magnonic system, where the magnon mode and the cavity mode are each coupled to a separate waveguide injected with squeezed vacuum. We show that the squeezing effect results in a wider visibility bandwidth over which high visibility is maintained, thereby improving the scan rate of the axion haloscope compared to the quantum-limited ferromagnetic haloscope.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856759","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}

{"title":"Quantum Phase Transitions in Coherent Ising Machines: XY Model for Demonstration","authors":"Shuang-Quan Ma,&nbsp;Jing-Yi-Ran Jin,&nbsp;Qing Ai","doi":"10.1002/qute.70428","DOIUrl":"https://doi.org/10.1002/qute.70428","url":null,"abstract":"<div>\u0000 \u0000 <p>In this work, we study the detection of quantum phase transitions (QPTs) in coherent Ising machines (CIMs) through a spectral mapping between the one-dimensional XY spin model and a network of degenerate optical parametric oscillators (DOPOs). This exact correspondence reveals that the DOPO spectrum faithfully encodes the critical behavior of anisotropic and isotropic XY chains, while a strongly anisotropic regime provides a controlled near-transverse-field-Ising realization, with the energy gap closing precisely at the critical point. The ground-state energy density and its derivatives are analyzed, and the resulting singularities in magnetic susceptibility accurately pinpoint the quantum critical points of the corresponding spin model. These results show that CIMs not only serve as powerful platforms for solving combinatorial optimization problems but also provide a versatile tool for probing universal quantum critical phenomena, bridging quantum-spin models and photonic quantum systems.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856755","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}

{"title":"Coherence-Preserving Fluctuation Diagnostics for an Engineered Population-Inverted Qubit Otto Engine","authors":"Gabriella G. Damas,&nbsp;Norton G. de Almeida,&nbsp;Gao Xianlong,&nbsp;G. D. de Moraes Neto","doi":"10.1002/qute.70412","DOIUrl":"https://doi.org/10.1002/qute.70412","url":null,"abstract":"<div>\u0000 \u0000 <p>Finite-time quantum thermal machines require diagnostics beyond average work and efficiency because microscopic engines operate where fluctuations, incomplete thermalization, and coherence strongly affect performance. A coherence-preserving fluctuation diagnostic is developed for an engineered qubit Otto engine coupled to an actively maintained population-inverted hot channel. The cycle is analyzed through a Dynamic Bayesian Network (DBN) reconstruction of the unmeasured coherent dynamics, yielding work, heat, power, and regularized efficiency fluctuations without the projective dephasing imposed by two-point measurement (TPM) schemes. Because the inverted channel is treated as an active reduced-model resource, the reported enhancements represent gross working-medium advantages rather than net device efficiencies. In the full-thermalization limit, population inversion increases extracted work and output power and opens a stability sector with substantially reduced relative power fluctuations. For finite hot and cold isochores, this enhancement reorganizes into distinct high-power, high-efficiency, and low-noise operating sectors governed by the competition between nonadiabatic driving and thermalization timescales. Comparison with TPM shows that the two reconstructions diverge in coherence-rich regimes, while coherence analysis indicates that the inverted high-efficiency branch remains aligned with the dominant post-hot-bath coherence ridge.</p>\u0000 </div>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"9 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856695","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}