Advanced quantum technologies最新文献

{"title":"Spin Pumping in Epitaxial Ge1-xSnx Alloys","authors":"Emanuele Longo,&nbsp;Omar Concepción,&nbsp;Roberto Mantovan,&nbsp;Marco Fanciulli,&nbsp;Maksym Myronov,&nbsp;Emiliano Bonera,&nbsp;Jacopo Pedrini,&nbsp;Dan Buca,&nbsp;Fabio Pezzoli","doi":"10.1002/qute.202400508","DOIUrl":"https://doi.org/10.1002/qute.202400508","url":null,"abstract":"<p>The use of Ge_1-xSn_x semiconductor alloys is generating significant interest in the scientific community due to their precisely tunable Sn content. This tunability makes them particularly attractive for applications in photonics, electronics, and, more recently, spintronics. Room-temperature emission and detection of spin currents are observed in Ge_1-xSn_x/Co hybrids through spin-pumping ferromagnetic resonance. Experiments conducted over a wide range of compositions and strains show that spin current injection is enhanced in Ge_1-xSn_x solid solutions compared to elemental Ge. The magnetization dynamics reveal an intriguing scenario where the Gilbert damping constant and the spin mixing conductance display a non-monotonic behavior. The maximum spin-pumping efficiency occurs at a Sn molar fraction of ≈10 at.% and remains unaffected by the elastic strain built up in Ge_1-xSn_x films through epitaxial growth on Ge-buffered Si substrates. These findings highlight the non-trivial dependence of alloy scattering in defining spin accumulation and relaxation mechanisms, providing insightful information on phenomena at the forefront of spintronics and quantum technology research.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400508","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944403","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":"Back Cover: Purity-Assisted Zero-Noise Extrapolation for Quantum Error Mitigation (Adv. Quantum Technol. 12/2024)","authors":"Tian-Ren Jin,&nbsp;Yun-Hao Shi,&nbsp;Zheng-An Wang,&nbsp;Tian-Ming Li,&nbsp;Kai Xu,&nbsp;Heng Fan","doi":"10.1002/qute.202470037","DOIUrl":"https://doi.org/10.1002/qute.202470037","url":null,"abstract":"<p>Zero noise extrapolation (ZNE) is a method that amplifies and extrapolates noise to a noise-free point. The cover image shows a modified method called purity-assisted ZNE (pZNE). This method enhances the effectiveness of ZNE by accumulating the noises with the forward and backward evolutions to extrapolate the ideal expectation from noisy expectations along the purity of the noisy output state to the ideal pure state. For further details, see article number 2400150 by Kai Xu, Heng Fan, 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":"7 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868348","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":"Inside Front Cover: Numerical Investigation of a Coupled Micropillar - Waveguide System for Integrated Quantum Photonic Circuits (Adv. Quantum Technol. 12/2024)","authors":"Léo J. Roche,&nbsp;Fridtjof Betz,&nbsp;Yuhui Yang,&nbsp;Imad Limame,&nbsp;Ching-Wen Shih,&nbsp;Sven Burger,&nbsp;Stephan Reitzenstein","doi":"10.1002/qute.202470036","DOIUrl":"https://doi.org/10.1002/qute.202470036","url":null,"abstract":"<p>This cover image is the 3D rendering of a quantum photonic device concept consisting of a whispering gallery mode microlaser coupled to a ridge waveguide. Such a device could potentially be used to resonantly excite a single-photon emitter that is subsequently integrated into a ridge waveguide. This allows for on-chip and on-demand generation of single photons in the context of integrated quantum photonic circuits. In article number 2400195, Stephan Reitzenstein and co-workers use finite element simulations to investigate the resonance quality of the cavity and its coupling efficiency.\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":"7 12","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202470036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868347","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":"A Fully-Integrated Diamond Nitrogen-Vacancy Magnetometer with Nanotesla Sensitivity","authors":"Yulin Dai,&nbsp;Wenhui Tian,&nbsp;Qing liu,&nbsp;Bao Chen,&nbsp;Yushan Liu,&nbsp;Qidi Hu,&nbsp;Zheng Ma,&nbsp;Yunpeng Zhai,&nbsp;Haodong Wang,&nbsp;Ying Dong,&nbsp;Nanyang Xu","doi":"10.1002/qute.202300438","DOIUrl":"https://doi.org/10.1002/qute.202300438","url":null,"abstract":"<p>Ensemble diamond nitrogen-vacancy (DNV) centers have emerged as a promising platform for precise earth-field vector magnetic sensing, particularly in applications that require high mobility. Nevertheless, integrating all control utilities into a compact form has proven challenging, thus far limiting the sensitivity of mobile DNV magnetometers to the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>μ</mi>\u0000 <mi>T</mi>\u0000 </mrow>\u0000 <annotation>$mu{rm T}$</annotation>\u0000 </semantics></math>-level. This study introduces a fully integrated DNV magnetometer that encompasses all the essential components typically found in traditional platforms, while maintaining compact dimensions of approximately <span></span><math>\u0000 <semantics>\u0000 <mi>Φ</mi>\u0000 <annotation>$Phi$</annotation>\u0000 </semantics></math> 13 cm <span></span><math>\u0000 <semantics>\u0000 <mo>×</mo>\u0000 <annotation>$times$</annotation>\u0000 </semantics></math> 26 cm. In contrast to previous efforts, these challenges are successfully addressed by integrating a high-power laser, a lock-in amplifier, and a digitally-modulated microwave source. These home-made components show comparable performance with commercial devices under the circumstance, resulting in an optimal sensitivity approaching 2.14 nT (<span></span><math>\u0000 <semantics>\u0000 <msqrt>\u0000 <mrow>\u0000 <mi>H</mi>\u0000 <mi>z</mi>\u0000 </mrow>\u0000 </msqrt>\u0000 <annotation>$sqrt {Hz}$</annotation>\u0000 </semantics></math>)⁻¹. The limitations in this system as well as possible future improvements are discussed. This work paves the way for the use of DNV magnetometry in cost-effective, mobile unmanned aerial vehicles, facilitating a wide range of practical applications.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793631","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":"Simultaneous Photon and Phonon Lasing From Pumping Optomechanical Systems with a Two-Tone Field","authors":"Vitalie Eremeev,&nbsp;Hugo Molinares,&nbsp;Luis A. Correa,&nbsp;Bing He","doi":"10.1002/qute.202400497","DOIUrl":"https://doi.org/10.1002/qute.202400497","url":null,"abstract":"<p>Achieving simultaneous lasing of photons and phonons in optomechanical setups has great potential for applications in quantum information processing, high precision sensing and the design of hybrid photonic–phononic devices. Here, this possibility is explored with an optomechanical system driven by a two-tone field. Whenever the difference between the driving frequencies matches the associated mechanical frequency, the photon and phonon populations are found to achieve steady-state coherent oscillations, demonstrating a dual lasing phenomenon. Such drive–tone resonance condition can synchronize the phases of the photon and phonon fields, which facilitates a robust simultaneous lasing. Here, analytical insights into the joint amplification of the optical and mechanical modes are provided, and further confirm the dual lasing phenomenon by numerically calculating the relevant correlation functions and the power spectrum. This setup, consisting of a single optomechanical cavity, is simpler than previous realizations of dual lasing and provides a clean understanding of the underlying mechanisms. This work thus paves the way for the development of novel strategies for the optimisation of optomechanical interactions through tailored driving schemes.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622717","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":"Universal Multiport Interferometers for Post-Selected Multi-Photon Gates","authors":"Alessio Baldazzi,&nbsp;Lorenzo Pavesi","doi":"10.1002/qute.202400418","DOIUrl":"https://doi.org/10.1002/qute.202400418","url":null,"abstract":"<p>It is showed how to use universal multiport interferometers' schemes in order to create photonic post-selected Controlled-Z and Controlled–Controlled-Z gates, which are equivalent, modulo single-qubit gates, to Controlled-NOT and Toffoli gates, respectively. The new proposed method is based on the following ingredients: identical single photons, Mach–Zehnder interferometer networks, single-photon detectors and post-selection. In particular, by using dual-rail path encoding together with auxiliary paths and single photons, the success probabilities of such gates is improved. This result further proves the complexity and richness of Reck and Clements schemes beyond the usual notions and practices of Boson Sampling.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944869","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":"Versatile Quadrature Antenna for Precise Control of Large Electron Spin Ensembles in Diamond","authors":"Ruben Pellicer-Guridi,&nbsp;Koen Custers,&nbsp;Joseba Solozabal-Aldalur,&nbsp;Alexey Brodolin,&nbsp;Jason T. Francis,&nbsp;Miguel Varga,&nbsp;Asier Mongelos,&nbsp;Jorge Casanova,&nbsp;Margarethus M. Paulides,&nbsp;Gabriel Molina-Terriza","doi":"10.1002/qute.202400142","DOIUrl":"https://doi.org/10.1002/qute.202400142","url":null,"abstract":"<p>An easily reproducible inexpensive microwave antenna that can generate a strong and homogeneous magnetic field of arbitrary polarization is presented, which enables fast and coherent control of electron spins over a large volume. Unlike preceding works, a resonant antenna with ample optical access and which maintains its resonant behavior regardless of the proximity of other experimental hardware components is presented. This robustness is crucial as it enables using microscope objectives with short working distances to perform wide-field imaging/sensing with bulk diamonds. The antenna generates a magnetic field strength of 22.3 A <span></span><math>\u0000 <semantics>\u0000 <msup>\u0000 <mi>m</mi>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msup>\u0000 <annotation>${rm m}^{-1}$</annotation>\u0000 </semantics></math> for 1 W total driving power, which doubles the power efficiency compared with previously reported patch antenna designs. The magnetic field homogeneity in a volume of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>0.3</mn>\u0000 <msup>\u0000 <mtext>mm</mtext>\u0000 <mn>3</mn>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$0.3text{mm}^3$</annotation>\u0000 </semantics></math>, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>0.6</mn>\u0000 <msup>\u0000 <mtext>mm</mtext>\u0000 <mn>3</mn>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$0.6text{mm}^3$</annotation>\u0000 </semantics></math> and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>1</mn>\u0000 <msup>\u0000 <mtext>mm</mtext>\u0000 <mn>3</mn>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$1text{mm}^3$</annotation>\u0000 </semantics></math> is within 3%, 8% and 14%, respectively. The antenna can be driven off-resonance without affecting the ellipticity and inhomogeneity of the field, and has a full-width-at-half-maximum bandwidth of <span></span><math>\u0000 <semantics>\u0000 <mo>∼</mo>\u0000 <annotation>$sim$</annotation>\u0000 </semantics></math>200 MHz. Its resonant frequency can be tuned over a 400 MHz range via varactors. The PCB files are provided open-source. This work facilitates a robust and versatile piece of instrumentation, being particularly appealing for applications such as high sensitivity magnetometry and wide-field imaging/sensing with nitrogen-vacancy centers.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400142","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622713","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":"Prediction and Computational Analysis of Annular Photonic Crystal Based Multifunctional Directional Coupler Quantum Device for Optical Networks","authors":"Pradeep Doss M,&nbsp;R. K. Jeyachitra","doi":"10.1002/qute.202400387","DOIUrl":"https://doi.org/10.1002/qute.202400387","url":null,"abstract":"<p>In this research article, a novel all-optical directional coupler switch is designed with multifunctionality for various optical network applications. The analog Silicon (Si) and Silicon Dioxide (SiO₂) based annular crystal nano-resonator in photonic crystal (PC) platform is used to realize the 2 × 2 structure and is further explored. The proposed structure dimensions are predicted by using Machine Learning (ML) based random forest regression model, design and numerical analysis is carried out using Finite-Difference-Time-Domain (FDTD) method. Dataset records are collected by varying the input launch type, operating wavelength, and annular photonic crystal (APC) dimensions, the electric field and normalized power values in all ports are calculated. Optical network devices with high-performance is realized, such as an optical coupler switch, wavelength selective switches (WSS), slow light device, and an optical multiplexer. Hence, the reported photonics platform with a compact size of 98.96 µm², fast response time, and high extinction ratio providing multifunctional operation with quantum computing is more appropriate for microwave photonics, optical interconnects, and quantum computing.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944988","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 Gates with Different Robust Merits","authors":"Chunfang Sun,&nbsp;Yimin Wang,&nbsp;Gangcheng Wang,&nbsp;Chunfeng Wu","doi":"10.1002/qute.202400301","DOIUrl":"https://doi.org/10.1002/qute.202400301","url":null,"abstract":"<p>A protocol for implementing a universal set of quantum gates, which are safeguarded from noise through geometric, dephasing-free, and dynamical-decoupling approaches is proposed. With properly designed Hamiltonians, the desired interactions are realized directly within the Schrödinger picture rather than relying on the interaction picture. This design confers two advantages. One is that the system's evolution remains continuously protected by the noise-mitigation strategies at every stage, eliminating the need to revert to the Schrödinger picture. The other one is that the dynamical decoupling technique effectively averages out small residual free terms in the system's Hamiltonian, thus reducing the stringent requirements for precise control of system parameters to avoid errors. Furthermore, numerical results are presented to support our protocol by finding gate fidelities in the absence (presence) of noises or errors, without or with dynamical decoupling technique.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945028","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":"Classification Analysis of Transition Metal Compounds Using Quantum Machine Learning","authors":"Kurudi V Vedavyasa,&nbsp;Ashok Kumar","doi":"10.1002/qute.202400081","DOIUrl":"https://doi.org/10.1002/qute.202400081","url":null,"abstract":"<p>Quantum machine learning (QML) leverages the potential of machine learning (ML) to explore the subtle patterns in huge datasets of complex nature with quantum advantages. QML accelerates materials research with active screening of chemical space, identifying novel materials for practical applications, and classifying structurally diverse materials given their measured properties. This study analyzes the performance of three efficient quantum machine learning algorithms viz., variational quantum classifier (VQC), quantum support vector classifier (QSVC), and quantum neural networks (QNN) for distinguishing transition metal chalcogenides (TMCs) from transitional metal oxides (TMOs). By employing feature selection, classical machine learning achieves 100% accuracy whereas QML achieves the highest performance of 99% and 98% for test and train data respectively on QSVC. Further, to extend the QML models for structural and functional analysis of materials that cannot be inferred directly from the formula, stability analysis, and magnetic nature analysis on 1000 and 500 materials are performed, respectively. The stability analysis achieves 78% accuracy with QSVC and the magnetic nature analysis achieves 88% with QNN establishing the competence of QML models. This study proves that QML models are remarkable in materials classification and analysis which fuels the task of materials discovery in the future.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944997","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}