Materials Today Quantum最新文献

{"title":"Hexagonal supertetrahedral gallium: a cluster-based three-dimensional topological metal","authors":"Yuanze Song ,&nbsp;Ting Zhang ,&nbsp;Weizhen Meng ,&nbsp;Jing Wang ,&nbsp;Ying Liu","doi":"10.1016/j.mtquan.2025.100050","DOIUrl":"10.1016/j.mtquan.2025.100050","url":null,"abstract":"<div><div>Two novel three-dimensional allotropes, designated as hexagonal supertetrahedral aluminum and gallium (<em>h</em>-Al/<em>h</em>-Ga), are proposed based on a hexagonal diamond structure and share the same space group symmetry (<em>P</em>6₃/<em>mmc</em>) as hexagonal diamond. First-principles calculations demonstrate their structural stability and superior mechanical properties. Notably, these allotropes exhibit distinct electronic characteristics: <em>h</em>-Al behaves as a narrow-bandgap semiconductor, while <em>h</em>-Ga manifests as a topological semimetal with multiple band crossings. We systematically investigate the topological characteristics of <em>h</em>-Ga, which hosts three distinct classes of topological states: triple point, nodal line, and nodal surface, with associated Fermi arcs and drumhead-like surface states. Furthermore, the inclusion of spin-orbit coupling lifts all topological degeneracies, driving a phase transition to a Dirac semimetal. Our findings not only contribute to the expansion of the supertetrahedral materials family but also underscore hexagonal supertetrahedral lattices as a robust and versatile platform for the discovery of diverse topological phases.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"7 ","pages":"Article 100050"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893008","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":"A review of quantum imaging methods and enabling technologies","authors":"Duncan P. Ryan,&nbsp;James H. Werner","doi":"10.1016/j.mtquan.2025.100044","DOIUrl":"10.1016/j.mtquan.2025.100044","url":null,"abstract":"<div><div>The field of quantum imaging has recently seen an explosion of new methods and techniques. At the heart of most quantum imaging approaches are three enabling technologies: the source of the quantum light, the detectors that turn sensing into imaging, and the method by which the quantum nature of light is leveraged to improve the desired measurement. This review addresses the dominant and emerging technologies in each of these components as well as details concerning the implementations of various quantum imaging methods.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100044"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203390","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":"More buck-per-shot: Why learning trumps mitigation in noisy quantum sensing","authors":"Aroosa Ijaz ,&nbsp;C. Huerta Alderete ,&nbsp;Frédéric Sauvage ,&nbsp;Lukasz Cincio ,&nbsp;M. Cerezo ,&nbsp;Matthew L. Goh","doi":"10.1016/j.mtquan.2025.100042","DOIUrl":"10.1016/j.mtquan.2025.100042","url":null,"abstract":"<div><div>Quantum sensing is one of the most promising applications for quantum technologies. However, reaching the ultimate sensitivities enabled by the laws of quantum mechanics can be a challenging task in realistic scenarios where noise is present. While several strategies have been proposed to deal with the detrimental effects of noise, these come at the cost of an extra shot budget. Given that shots are a precious resource for sensing – as infinite measurements could lead to infinite precision – care must be taken to truly guarantee that any shot not being used for sensing is actually leading to some metrological improvement. In this work, we study whether investing shots in error-mitigation, inference techniques, or combinations thereof, can improve the sensitivity of a noisy quantum sensor on a (shot) budget. We present a detailed bias–variance error analysis for various sensing protocols. Our results show that the costs of zero-noise extrapolation techniques outweigh their benefits. We also find that pre-characterizing a quantum sensor via inference techniques leads to the best performance, under the assumption that the sensor is sufficiently stable.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100042"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098742","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":"Structural, optical, and electronic properties of MgxZn1-xO (0 ≤ x ≤ 0.38) films pseudomorphically grown on Zn-polar ZnO substrates","authors":"Yusuke Kozuka ,&nbsp;Shunsuke Tsuda ,&nbsp;Thang Dinh Phan ,&nbsp;Koichiro Yaji ,&nbsp;Jun Uzuhashi ,&nbsp;Tadakatsu Ohkubo ,&nbsp;Takanobu Hiroto ,&nbsp;Takayuki Makino ,&nbsp;Joseph Falson ,&nbsp;Atsushi Tsukazaki ,&nbsp;Masashi Kawasaki","doi":"10.1016/j.mtquan.2025.100036","DOIUrl":"10.1016/j.mtquan.2025.100036","url":null,"abstract":"<div><div>ZnO is a typical oxide semiconductor with a wide direct band gap of 3.37 eV and offers a variety of possibilities for optical and electronic applications. Alloying with Mg into the Zn site increases the band gap, enabling band engineering. In this study, we have performed comprehensive characterizations of Mg_<em>x</em>Zn_1-<em>x</em>O thin films grown on Zn-polar ZnO substrates, which are of particular importance because of the excellent quality compared with those grown on other substrates such as Al₂O₃. We have obtained Mg content dependence of optical constants, two-dimensional carrier density, and valence band and core-level energies. These results indicate that, while the optical property is determined solely by the Mg content in the bulk, local structure, and Mg distribution can have a significant influence on the interface and surface properties.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100036"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807281","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":"Strongly confined Te quantum dots as building blocks for single photon sources","authors":"Rajendra Subedi ,&nbsp;Francisco Ruiz-Zepeda ,&nbsp;Yagya Bahadur Woli ,&nbsp;Thang Ba Hoang ,&nbsp;Julien Chaste ,&nbsp;Etienne Herth ,&nbsp;Grégory Guisbiers","doi":"10.1016/j.mtquan.2025.100034","DOIUrl":"10.1016/j.mtquan.2025.100034","url":null,"abstract":"<div><div>Tellurium is a heavy chemical element exhibiting chirality, anisotropy, and strong spin-orbit coupling; consequently, displaying a huge potential in quantum hardware technologies. In this article, tellurium quantum dots, with sizes around 19 ± 3 nm and energy bandgap around 2.4 eV, were successfully synthesized by pulsed laser ablation in liquids (PLAL). The synthesis was performed by using a nanosecond Nd:YAG laser emitting at 1064 nm and pulsing the laser beam at 1 kHz. Toluene (C₆H₅CH₃) was used as a solvent to avoid oxidation of the dots. Non-polarized and polarized Raman spectroscopy as well as X-Ray diffraction were performed on the dots to study their quantum confinement and anisotropy. Finally, strongly confined tellurium quantum dots were obtained; and, their properties underline their potential as quantum light sources.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100034"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680889","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":"Innovative direct manufacturing of tungsten carbide superconducting nanowires for photon detection applications via pulsed focused ion beam induced deposition","authors":"Cristina García-Pérez ,&nbsp;Fernando J. Urbanos ,&nbsp;Gabriel Caballero ,&nbsp;Manuel R. Osorio ,&nbsp;Alicia Gómez ,&nbsp;Ramón Bernardo-Gavito ,&nbsp;Daniel Granados","doi":"10.1016/j.mtquan.2025.100043","DOIUrl":"10.1016/j.mtquan.2025.100043","url":null,"abstract":"<div><div>We present the development and optical characterization of tungsten carbide superconducting nanowire devices for photon detection. They are nanofabricated by direct deposition via pulsed focused ion beam induced deposition (PFIBID) using Tungsten Hexacarbonyl (W(CO)₆) as precursor. The nanowires exhibit a critical temperature of 4.71 K and demonstrate a notable response to low-intensity CW or pulsed laser illumination. For the first time, in-operando photoresponse low-temperature maps reveal hotspot distributions under low power illumination and localized superconductivity suppression upon high fluence photon absorption at higher powers. Dynamic response measurements under 1 MHz repetition rate, 640 nm pulsed laser excitation highlight the fast temporal response of the detectors and high operation stability near saturation. While currently operating in the multi-photon regime (9 photons/output-pulse), the findings emphasize their potential for single-photon detection with further optimization of material thickness (target &lt;25 nm) and excitation schemes. This work demonstrates the significant promise to direct nanofabricate superconducting devices based on WC for advanced quantum applications.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100043"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906267","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 computing for molecular vibrational energies: A comprehensive study","authors":"Somasundaram R. ,&nbsp;Jayaharish R. ,&nbsp;Rohith Ramanan ,&nbsp;Chandra Chowdhury","doi":"10.1016/j.mtquan.2025.100031","DOIUrl":"10.1016/j.mtquan.2025.100031","url":null,"abstract":"<div><div>In this work, we present a comprehensive comparative study between two different <em>Ansatz</em> quantum circuits, specifically the Unitary Vibrational Coupled Cluster (UVCC) and the Compact Heuristic Circuit (CHC) with use in computational chemistry. By incorporating these circuits into the Variational Quantum Eigensolver (VQE), we aim to find the vibrational ground state energy of small molecules. Our results, obtained using both the UVCC and CHC ansatzes with and without quantum hardware noise, are benchmarked against classical computational methods for energy state determination. We emphasize the efficiency and accuracy of the CHC <em>Ansatz</em>, which significantly reduces circuit complexity without sacrificing the fidelity of the results. This characteristic demonstrates the potential of the CHC <em>Ansatz</em> for scalable quantum chemistry applications, particularly in the Noisy Intermediate-Scale Quantum (NISQ) era. Furthermore, we employ the CHC <em>Ansatz</em> in conjunction with the Variational Quantum Deflation (VQD) algorithm to determine the excited vibrational state energies, which is compared against the reliable method of quantum Equation of Motion(qEOM). Through this comparative study, we aim to provide valuable insights into the practical applications of these <em>Ansatz</em> in quantum simulations of molecular systems, highlighting their respective advantages and potential for future quantum chemistry research.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100031"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817226","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":"Magnetic order through Kondo coupling to quantum spin liquids","authors":"M.A. Keskiner ,&nbsp;M.Ö. Oktel ,&nbsp;Natalia B. Perkins ,&nbsp;Onur Erten","doi":"10.1016/j.mtquan.2025.100038","DOIUrl":"10.1016/j.mtquan.2025.100038","url":null,"abstract":"<div><div>We study the emergence of magnetic order in localized spins that interact solely through their coupling to a Kitaev-type spin liquid. Using three toy models – the Kitaev model, the Yao–Lee model, and a square-lattice generalization of the Kitaev model – we calculate the effective exchange Hamiltonians mediated by the fractionalized excitations of these spin liquids. This setup is analogous to a Kondo lattice model, where conduction electrons are replaced by itinerant Majorana fermions. In the Kitaev model, our results show that the lowest-order perturbation theory generates short-range interactions with modified couplings and extending to sixth order introduces longer-range interactions while preserving the quantum spin-liquid ground state. Models involving more Majorana flavors on honeycomb and square lattices exhibit more complex behavior. The honeycomb Yao–Lee model with three flavors of itinerant Majorana fermions generates long-range RKKY-type interactions, leading to antiferromagnetic order and partial gapping of the Majorana fermion spectrum. In contrast, the square-lattice model produces a combination of anisotropic short- and long-range interactions, which can give rise to either a dimerized quantum paramagnetic state or an Ising antiferromagnet, depending on the parameters. These results illustrate the rich variety of magnetic orders that can be mediated by Kitaev-type spin liquids.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100038"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869662","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":"Spin interactions in decorated graphene nanoflakes with two localized spin-1/2 entities","authors":"Toshikaze Kariyado","doi":"10.1016/j.mtquan.2025.100041","DOIUrl":"10.1016/j.mtquan.2025.100041","url":null,"abstract":"<div><div>Magnetic properties of graphene nanoflakes with designed edge shapes are theoretically analyzed by means of the first-principles calculation. As a starting point, we take a nanoflake with decorated zigzag edges where no magnetism is expected. Then, it is shown that removal of one decoration unit induces a well-defined localized spin-1/2 state. When two decoration units are removed, there arise two localized spin-1/2 states. Notably, when two spins are aligned in the same edge, the spin–spin interaction is ferromagnetic, while when two spins are aligned in the opposite edges, the spin–spin interaction is antiferromagnetic. This suggests that decorated nanoflakes form a promising playground for nanoscale spin devices with tunable spin–spin interactions by designing edge shapes.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100041"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936576","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":"Ultrafast dynamics and tunable coherent optical phonons via hybridization and gold layering in hybrid topological Bi2Se1.5Te1.5","authors":"Prince Sharma ,&nbsp;Rahul Sharma ,&nbsp;Saurabh Saini ,&nbsp;Kapil Kumar ,&nbsp;Sumeet Walia ,&nbsp;Mahesh Kumar","doi":"10.1016/j.mtquan.2025.100035","DOIUrl":"10.1016/j.mtquan.2025.100035","url":null,"abstract":"<div><div>Topological insulators (TIs) are quantum materials that offer exotic optoelectronic, magnetic, and spintronic properties and lead to numerous applications such as quantum computing, Majorana Fermions, superconductivity, terahertz frequency generation, spintronics, thermoelectricity, and optoelectronics. TIs are inherently insulating in bulk, but, the topologically active surface states offer free electrons on the surfaces to enable them to be conducted on the surface. However, binary tetradymites (Bi₂Se₃, Bi₂Te₃, and Sb₂Te₃) are not fully insulating in bulk due to their semiconducting characteristics. To overcome this behaviour, the pure TIs can be converted to a new class of hybrid topological insulators (HTI) via doping. In this article, we present a detailed analysis of such kinds of HTI Bi₂Se_1.5Te_1.5 by examining their symmetry, band structure, charge carrier and phonon dynamics. Unlike pure TIs, this HTI possesses distinct optical properties, which are explored in this study. Additionally, a 15 nm gold film is deposited on TIs (Bi₂Se₃ and Bi₂Te₃) and HTI (Bi₂Se_1.5Te_1.5) crystal flakes to investigate the interaction between gold (Au) plasmonic coupling with these materials using transient reflectance spectroscopy. The main goal of Au is to tune the optical response of TIs through the plasmonic effect of Au. Besides carrier dynamics, the study also examines coherent acoustic and optical phonons in Bi₂Se₃, Bi₂Te₃ and Bi₂Se_1.5Te_1.5 as well as along with Au layered micro flakes. The hybrid Bi₂Se_1.5Te_1.5 topological material and gold layering introduce new opportunities for optoelectronics and spintronics, offering broad tunability in various optical and near-infrared regions.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100035"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739648","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}