Advanced quantum technologies最新文献

{"title":"Extreme Plasmons (Adv. Quantum Technol. 6/2025)","authors":"Aakash A. Sahai","doi":"10.1002/qute.202570012","DOIUrl":"https://doi.org/10.1002/qute.202570012","url":null,"abstract":"<p>The cover picture shows a model of nonperturbative oscillations of quantum electron gas, collisionlessly excited by an ultraintense, ultrashort electron beam propagating in a conductive tube. These large-amplitude, coherent oscillations of conduction electron gas can uncover access to unprecedented PetaVolts per meter fields which open new possibilities that include gamma-ray lasers and particle colliders on a chip. More in article number 2500037, Aakash Sahai.\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 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273239","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. 6/2025)","authors":"","doi":"10.1002/qute.202570013","DOIUrl":"https://doi.org/10.1002/qute.202570013","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273240","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":"Extreme Plasmons","authors":"Aakash A. Sahai","doi":"10.1002/qute.202500037","DOIUrl":"https://doi.org/10.1002/qute.202500037","url":null,"abstract":"<p>Nanometric confinement of electromagnetic energy has become possible using plasmons that are quasiparticles constituted by collective oscillations of conduction band electron gas. Here, nonperturbative plasmons are modeled having large-amplitude oscillations that approach the extreme limit set by breakdown in characteristic coherence of collective quantum electron gas oscillations. In contrast, conventional plasmons are small-amplitude oscillations. Controlled excitation of such extreme plasmons modeled here has become realizable now with trends in ultrashort particle bunch compression. Extreme plasmons unleash unparalleled possibilities including access to unprecedented Petavolts per meter fields. In this work, an analytical model of this class of plasmons is developed based on quantum kinetic framework. A controllable extreme plasmon, the surface crunch-in plasmon, is modeled here using a modified independent electron approximation. In this model, various quantum effects such as suppression of electron–electron interactions due to non-classical equilibrium states at trajectory extrema are incorporated by introducing a quantum factor, <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>F</mi>\u0000 <mi>Q</mi>\u0000 </msub>\u0000 <annotation>$mathcal {F}_Q$</annotation>\u0000 </semantics></math>.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273423","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":"Issue Information (Adv. Quantum Technol. 5/2025)","authors":"","doi":"10.1002/qute.202570011","DOIUrl":"https://doi.org/10.1002/qute.202570011","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944803","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 Ghost Imaging by Sparse Spatial Mode Reconstruction (Adv. Quantum Technol. 5/2025)","authors":"Fazilah Nothlawala,&nbsp;Chané Moodley,&nbsp;Neelan Gounden,&nbsp;Isaac Nape,&nbsp;Andrew Forbes","doi":"10.1002/qute.202570010","DOIUrl":"https://doi.org/10.1002/qute.202570010","url":null,"abstract":"<p>In article number 2400577, Andrew Forbes and co-workers achieved high resolution, time-efficient quantum ghost imaging by leveraging structured light and spatial modes as a basis for imaging, paving the way for breakthroughs in low-light, biological science applications. The cover represents an object — the ghost — whose image is revealed through spatial mode projections.\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 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944802","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":"Reference-Frame-Independent Asynchronous Measurement-Device-Independent Quantum Key Distribution","authors":"Kaiyi Shi,&nbsp;Yue Li,&nbsp;Haoyang Wang,&nbsp;Chang Liu,&nbsp;Duo Ma,&nbsp;Yujia Zhang,&nbsp;Fangze Ma,&nbsp;Haiqiang Ma","doi":"10.1002/qute.202400711","DOIUrl":"https://doi.org/10.1002/qute.202400711","url":null,"abstract":"<p>Asynchronous quantum key distribution protocol (AMDI-QKD) is a high performance quantum key distribution protocol while it can outperform the Pirandola–Laurenza–Ottaviani–Banchi (PLOB) bound without the need of phase-locking and phase-tracking techniques. However, the protocol applies the relative phase information of the communicating parties for encoding, and the drift of the reference frame inevitably affects the performance of the QKD system, whereas reference frame independent quantum key distribution (RFI-QKD) has the advantage of tolerating the slow change of the reference frame. In this study, a reference frame-independent asynchronous quantum key distribution (RFI-AMDI-QKD) scheme is proposed, which does not require phase alignment between the interferometers of both parties, and it is shown that the protocol can transmit over long distances and is robust to the drift of the reference frame.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945037","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":"On-Chip Apodized Hybrid Photonic-Plasmonic Cavity QED for Polarized Single Photons Coupling","authors":"Subrat Sahu,&nbsp;Colin Jacob,&nbsp;Abhishek Kumar,&nbsp;Rajan Jha","doi":"10.1002/qute.202400712","DOIUrl":"https://doi.org/10.1002/qute.202400712","url":null,"abstract":"<p>A system is proposed for the efficient coupling of plasmon-enhanced polarized single photons into a 1D apodized hybrid photonic-plasmonic (HPP) cavity structure, to realize cavity quantum electrodynamics (QED). The HPP cavity is formed by placing a gold nanorod (GNR) on an apodized 1D photonic crystal (PhC) cavity designed on a diamond waveguide. It is shown that the spontaneous emission of quantum emitters (QE) can be strongly enhanced by utilizing the combination of GNR and Phc cavity structure, leading to the emission of highly polarized and bright single photons. The Purcell factor is numerically estimated as high ≈5303, with a cavity-enhanced coupling efficiency of up to ≈24.3% and a degree of polarization (DOP) of more than 99%, in the guided modes of the HPP cavity. Under the resonance condition, a 28-fold increase in enhancement factor in the HPP cavity as compared to a moderate finesse-based Phc cavity is achieved. The cavity is designed to minimize the losses, resulting in a scattering-limited <i>Q</i>-factor and one-pass loss estimated to be around 21500 and 0.1%, respectively. This work paves the way to realize quantum photonic devices based on efficient photonic interfaces for on-chip quantum information processing applications.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944741","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 Temperature-Insensitive Optical Fiber Delay for Indistinguishability-Preserving Multiplexing of Photons","authors":"Eun Chae Ha,&nbsp;Young Hoon Kim,&nbsp;Hee Su Park,&nbsp;Kwang Yong Song","doi":"10.1002/qute.202400512","DOIUrl":"https://doi.org/10.1002/qute.202400512","url":null,"abstract":"<p>Quantum state purity, namely indistinguishability, of photons having different propagation histories is a prerequisite of multiphoton quantum information processing such as quantum networking and quantum computing. Although photonic multiplexing techniques using optical fiber delays can enhance the scalability of quantum states, the sensitivity of optical fibers to ambient temperature fluctuations deteriorates the indistinguishability of photons. This work demonstrates a novel optical differential delay using polarization-maintaining fibers, which suppresses temperature dependence by balancing thermal expansion with modal dispersion in a fully passive mechanism. Time-multiplexed Hong–Ou–Mandel interferometry under temperature variations from 24 to 50 °C verifies the effectiveness of the devised structure in a practical quantum photonics environment.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273446","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":"Distributed Quantum Algorithm for the NISQ Era: A Novel Approach to Solving Simon's Problem with Reduced Resources","authors":"Xu Zhou,&nbsp;Yuchen Wang,&nbsp;Wenxuan Tao,&nbsp;Zhuojun Zhou,&nbsp;Le Luo","doi":"10.1002/qute.202500067","DOIUrl":"https://doi.org/10.1002/qute.202500067","url":null,"abstract":"&lt;p&gt;Distributed quantum computation has gained significant interest in the noisy intermediate-scale quantum (NISQ) era. This paradigm requires each computing node to possess a reduced number of qubits and quantum gates. In this study, a Distributed Simon's Algorithm (DSA) is designed to tackle Simon's problem, which entails the discovery of a hidden string &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;mo&gt;∈&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;{&lt;/mo&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;}&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mi&gt;n&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$s in lbrace 0,1rbrace ^n$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; of a promised Boolean function &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;mo&gt;:&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;{&lt;/mo&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;}&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mi&gt;n&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;→&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;{&lt;/mo&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;}&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$f: lbrace 0,1rbrace ^n rightarrow lbrace 0,1rbrace ^m$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, where &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;x&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;y&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$f(x)=f(y)$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; if and only if &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;x&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mi&gt;y&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$x=y$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; or &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;x&lt;/mi&gt;\u0000 &lt;mi&gt;⊕&lt;/mi&gt;\u0000 &lt;mi&gt;y&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$x oplus y = s$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. Specifically, 1) our algorithm is capable of being partitioned into any &lt;span&gt;&lt;/","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944753","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":"Epitaxial Growth of Molecular Graphene on Metal Surface Alloy","authors":"Biyu Song,&nbsp;Xiamin Hao,&nbsp;Chenqiang Hua,&nbsp;Meimei Wu,&nbsp;Guoxiang Zhi,&nbsp;Wenjin Gao,&nbsp;Tianchao Niu,&nbsp;Miao Zhou","doi":"10.1002/qute.202400621","DOIUrl":"https://doi.org/10.1002/qute.202400621","url":null,"abstract":"<p>Molecular graphene provides an attractive man-made artificial system to realize designer Dirac fermions with exotic properties and significant implications in electronics/spintronics, but its large-scale fabrication remains a challenge as the available approach involves molecule-by-molecule manipulation of CO on a metal surface using a scanning tunneling microscopy tip. Here, we propose the epitaxial growth of molecular graphene on metal surface alloy, where CO molecules could be naturally self-assembled into a hexagonal lattice. Via high-throughput first-principles calculations, the adsorption behaviors of CO on 30 surface alloys Cu₂M (M represents the alloyed element) with a (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msqrt>\u0000 <mn>3</mn>\u0000 </msqrt>\u0000 <mo>×</mo>\u0000 <mrow></mrow>\u0000 <msqrt>\u0000 <mn>3</mn>\u0000 </msqrt>\u0000 </mrow>\u0000 <annotation>$sqrt{3}ensuremath{times{}}sqrt{3}$</annotation>\u0000 </semantics></math>)-<i>R</i>30° superstructure on Cu(111) is explored. By systematically analyzing the structures, energetic and electronic properties of the adsorbed systems with different CO coverages, three surface alloys, Cu₂Zn, Cu₂Ga, and Cu₂Ge, on which molecular graphene can be spontaneously formed, are successfully screened out. Remarkably, the self-assembled molecular graphene is featured by an effective four-band model involving the molecular (<span></span><math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mi>π</mi>\u0000 <mrow>\u0000 <mn>2</mn>\u0000 <msub>\u0000 <mi>p</mi>\u0000 <mi>x</mi>\u0000 </msub>\u0000 </mrow>\u0000 <mo>∗</mo>\u0000 </msubsup>\u0000 <annotation>$pi _{{mathrm{2}}{p_{mathrm{x}}}}^{mathrm{*}}$</annotation>\u0000 </semantics></math>, <span></span><math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mi>π</mi>\u0000 <mrow>\u0000 <mn>2</mn>\u0000 <msub>\u0000 <mi>p</mi>\u0000 <mi>y</mi>\u0000 </msub>\u0000 </mrow>\u0000 <mo>*</mo>\u0000 </msubsup>\u0000 <annotation>${pi}_{2{p}_{mathrm{y}}}^{ast}$</annotation>\u0000 </semantics></math>) orbitals of CO on a hexagonal lattice, leading to quantum spin Hall effect. This work paves an avenue for the large-scale growth of artificial graphene, which should stimulate immediate interest among experimentalists in the synthesis, characterization, and implementation of topological states for dissipationless transport and quantum computing.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273229","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}