Materials Today Quantum最新文献

Driven Majorana modes: A route to synthetic px+ipy superconductivity 驱动马约拉纳模式：合成px+ipy超导的途径

Materials Today Quantum Pub Date : 2025-06-18 DOI: 10.1016/j.mtquan.2025.100045

Lingyu Yang , Gia-Wei Chern , Shi-Zeng Lin

{"title":"Driven Majorana modes: A route to synthetic px+ipy superconductivity","authors":"Lingyu Yang , Gia-Wei Chern , Shi-Zeng Lin","doi":"10.1016/j.mtquan.2025.100045","DOIUrl":"10.1016/j.mtquan.2025.100045","url":null,"abstract":"<div><div>We propose a protocol to realize synthetic <span><math><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>+</mo><mi>i</mi><msub><mrow><mi>p</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></math></span> superconductors in one-dimensional topological systems that host Majorana fermions. By periodically driving a localized Majorana mode across the system, our protocol realizes a topological pumping of Majorana fermions, analogous to the adiabatic Thouless pumping of electrical charges. Importantly, similar to the realization of a Chern insulator through Thouless pumping, we show that pumping of Majorana zero modes could lead to a <span><math><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>+</mo><mi>i</mi><msub><mrow><mi>p</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></math></span> superconductor in the two dimensions of space and synthetic time. The Floquet theory is employed to map the driven one-dimensional system to a two-dimensional synthetic system by considering frequency as a new dimension. We demonstrate such Floquet <span><math><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>+</mo><mi>i</mi><msub><mrow><mi>p</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></math></span> superconductors using the Kitaev <span><math><mi>p</mi></math></span>-wave superconductor chain, a prototypical 1D topological system, as well as its more realistic realization in the 1D Kondo lattice model as examples. We further show the appearance of Majorana <span><math><mi>π</mi></math></span> mode at the Floquet zone boundary in an intermediate drive frequency region. Our work suggests a driven magnetic spiral coupled to a superconductor as a promising platform for the realization of novel topological superconductors.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"7 ","pages":"Article 100045"},"PeriodicalIF":0.0,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365926","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}

引用次数: 0

A review of quantum imaging methods and enabling technologies 量子成像方法及使能技术综述

Materials Today Quantum Pub Date : 2025-06-01 DOI: 10.1016/j.mtquan.2025.100044

Duncan P. Ryan, James H. Werner

引用次数: 0

More buck-per-shot: Why learning trumps mitigation in noisy quantum sensing 更多的单次奖励：为什么在嘈杂的量子传感中学习胜过缓解

Materials Today Quantum Pub Date : 2025-05-16 DOI: 10.1016/j.mtquan.2025.100042

Aroosa Ijaz , C. Huerta Alderete , Frédéric Sauvage , Lukasz Cincio , M. Cerezo , Matthew L. Goh

{"title":"More buck-per-shot: Why learning trumps mitigation in noisy quantum sensing","authors":"Aroosa Ijaz , C. Huerta Alderete , Frédéric Sauvage , Lukasz Cincio , M. Cerezo , 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":"2025-05-16","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}

引用次数: 0

Quantum metric nonlinear spin-orbit torque enhanced by topological bands 拓扑带增强的量子度量非线性自旋轨道转矩

Materials Today Quantum Pub Date : 2025-05-07 DOI: 10.1016/j.mtquan.2025.100040

Xukun Feng , Weikang Wu , Hui Wang , Weibo Gao , Lay Kee Ang , Y.X. Zhao , Cong Xiao , Shengyuan A. Yang

引用次数: 0

Spin interactions in decorated graphene nanoflakes with two localized spin-1/2 entities 具有两个定域自旋1/2实体的装饰石墨烯纳米片中的自旋相互作用

Materials Today Quantum Pub Date : 2025-05-05 DOI: 10.1016/j.mtquan.2025.100041

Toshikaze Kariyado

引用次数: 0

Innovative direct manufacturing of tungsten carbide superconducting nanowires for photon detection applications via pulsed focused ion beam induced deposition 利用脉冲聚焦离子束诱导沉积技术创新地直接制造用于光子探测的碳化钨超导纳米线

Materials Today Quantum Pub Date : 2025-04-26 DOI: 10.1016/j.mtquan.2025.100043

Cristina García-Pérez , Fernando J. Urbanos , Gabriel Caballero , Manuel R. Osorio , Alicia Gómez , Ramón Bernardo-Gavito , Daniel Granados

{"title":"Innovative direct manufacturing of tungsten carbide superconducting nanowires for photon detection applications via pulsed focused ion beam induced deposition","authors":"Cristina García-Pérez , Fernando J. Urbanos , Gabriel Caballero , Manuel R. Osorio , Alicia Gómez , Ramón Bernardo-Gavito , 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 <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":"2025-04-26","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}

引用次数: 0

Polariton-induced unconventional superconductivity and emergent SU(2) symmetry in moiré flat bands moirir平坦带中极化诱导的非常规超导性和涌现的SU(2)对称性

Materials Today Quantum Pub Date : 2025-04-26 DOI: 10.1016/j.mtquan.2025.100039

Kai Sun, Hui Deng

引用次数: 0

Magnetic order through Kondo coupling to quantum spin liquids 通过近藤耦合到量子自旋液体的磁序

Materials Today Quantum Pub Date : 2025-04-22 DOI: 10.1016/j.mtquan.2025.100038

M.A. Keskiner , M.Ö. Oktel , Natalia B. Perkins , Onur Erten

{"title":"Magnetic order through Kondo coupling to quantum spin liquids","authors":"M.A. Keskiner , M.Ö. Oktel , Natalia B. Perkins , 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":"2025-04-22","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}

引用次数: 0

Structural, optical, and electronic properties of MgxZn1-xO (0 ≤ x ≤ 0.38) films pseudomorphically grown on Zn-polar ZnO substrates 在锌极性ZnO衬底上生长的MgxZn1-xO（0 ≤x ≤ 0.38）伪晶薄膜的结构、光学和电子性质

Materials Today Quantum Pub Date : 2025-04-04 DOI: 10.1016/j.mtquan.2025.100036

Yusuke Kozuka , Shunsuke Tsuda , Thang Dinh Phan , Koichiro Yaji , Jun Uzuhashi , Tadakatsu Ohkubo , Takanobu Hiroto , Takayuki Makino , Joseph Falson , Atsushi Tsukazaki , Masashi Kawasaki

{"title":"Structural, optical, and electronic properties of MgxZn1-xO (0 ≤ x ≤ 0.38) films pseudomorphically grown on Zn-polar ZnO substrates","authors":"Yusuke Kozuka , Shunsuke Tsuda , Thang Dinh Phan , Koichiro Yaji , Jun Uzuhashi , Tadakatsu Ohkubo , Takanobu Hiroto , Takayuki Makino , Joseph Falson , Atsushi Tsukazaki , 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<sub><em>x</em></sub>Zn<sub>1-<em>x</em></sub>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 Al<sub>2</sub>O<sub>3</sub>. 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":"2025-04-04","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}

引用次数: 0

First-principles prediction of anisotropic superconductivity in the nodal-line semi-metal TlTaSe2 节点线半金属TlTaSe2各向异性超导的第一性原理预测

Materials Today Quantum Pub Date : 2025-04-03 DOI: 10.1016/j.mtquan.2025.100037

Mukhtar Lawan Adam , Ibrahim Buba Garba , Sulaiman Muhammad Gana , Bala Ismail Adamu , Abba Alhaji Bala , Abdulsalam Aji Suleiman , Ahmad Hamisu , Tijjani Hassan Darma , Auwal Musa , Abdulkadir S. Gidado

{"title":"First-principles prediction of anisotropic superconductivity in the nodal-line semi-metal TlTaSe2","authors":"Mukhtar Lawan Adam , Ibrahim Buba Garba , Sulaiman Muhammad Gana , Bala Ismail Adamu , Abba Alhaji Bala , Abdulsalam Aji Suleiman , Ahmad Hamisu , Tijjani Hassan Darma , Auwal Musa , Abdulkadir S. Gidado","doi":"10.1016/j.mtquan.2025.100037","DOIUrl":"10.1016/j.mtquan.2025.100037","url":null,"abstract":"<div><div>Recent advances in topological quantum materials have spurred significant interest in exploring superconductors that also host nontrivial band topology, as these materials can serve as platforms for novel electronic phases and quantum technologies. TlTaSe<sub>2</sub> is one such non-centrosymmetric, quasi-two-dimensional semimetal with nodal-line topological features protected by mirror-reflection symmetry. In this study, we theoretically predict its superconducting properties using first-principles anisotropic Migdal–Eliashberg theory. Our results indicate that the states at the Fermi, are primarily Ta 5d and Tl 6p orbitals. Thus, exhibiting a multiband electronic structure. Notably, from our calculations, we find two distinct superconducting gaps of 2.15 meV and 4.5 meV on different Fermi surface sheets, arising from strongly anisotropic electron-phonon interactions predominantly involving in-plane vibrations of the Ta and Tl atoms. Using the Allen–Dynes-modified McMillan formula with a Coulomb pseudopotential μ* = 0.16, we predict a superconducting transition temperature Tc of 6.67 K. These findings underscore the significance of TlTaSe<sub>2</sub> as a candidate for topological superconductivity and provide insights into how the interplay between anisotropy, electron-phonon coupling, and nontrivial band topology can be explored for quantum computing and spintronics applications.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"6 ","pages":"Article 100037"},"PeriodicalIF":0.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783879","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}

引用次数: 0