Advanced quantum technologies最新文献

{"title":"Robust Weak Measurements with Certified Single Photons (Adv. Quantum Technol. 7/2025)","authors":"Enrico Rebufello,&nbsp;Fabrizio Piacentini,&nbsp;Alessio Avella,&nbsp;Muriel A. de Souza,&nbsp;Marco Gramegna,&nbsp;Rudi Lussana,&nbsp;Federica Villa,&nbsp;Jan Dziewior,&nbsp;Eliahu Cohen,&nbsp;Lev Vaidman,&nbsp;Ivo Pietro Degiovanni,&nbsp;Marco Genovese","doi":"10.1002/qute.202570014","DOIUrl":"10.1002/qute.202570014","url":null,"abstract":"<p>Robust weak measurements are an experimental protocol able to reliably obtain (anomalous) weak values with single quantum systems even without averaging over multiple experimental runs. The picture shows an optical implementation able to extract the polarization weak value of heralded single photons, certifying the true single-particle, nonclassical nature of weak values. More in article number 2400482, Fabrizio Piacentini 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":"8 7","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635056","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":"Combining Squeezing and Transition Sensitivity Resources for Quantum Metrology by Asymmetric Non-Linear Rabi Model (Adv. Quantum Technol. 7/2025)","authors":"Zu-Jian Ying","doi":"10.1002/qute.202570015","DOIUrl":"10.1002/qute.202570015","url":null,"abstract":"<p>Squeezing and transition criticality are two major sensitivity resources for quantum metrology (QM), combination of them may yield an upgraded QM protocol. In article number 2400630, Zu-Jian Ying proposes that such a combination is feasible in asymmetric non-linear light-matter interaction. The protocol not only enhances measurement precision (MP) by several orders but also has advantages of globally high MP and dramatically reduced preparation time of probe state. This work establishes a paradigmatic case of combining different sensitivity resources to manipulate QM and maximize MP.\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 7","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202570015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635057","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":"QMM-Enhanced Error Correction: Demonstrating Reversible Imprinting and Retrieval for Robust Quantum Computation","authors":"Florian Neukart,&nbsp;Eike Marx,&nbsp;Valerii Vinokur,&nbsp;Jeff Titus","doi":"10.1002/qute.202500262","DOIUrl":"10.1002/qute.202500262","url":null,"abstract":"<p>The first hardware evidence is reported that a Quantum Memory Matrix (QMM) - conceived as a Planck-scale lattice of finite-dimensional memory cells - functions as an ultra-shallow, measurement-free error-suppression layer for noisy intermediate-scale quantum processors. On a seven-qubit IBM transmon device, quantum states are imprint onto local cells with single-qubit <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>R</mi>\u0000 <mi>y</mi>\u0000 </msub>\u0000 <annotation>$R_y$</annotation>\u0000 </semantics></math> and nearest-neighbor <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>C</mi>\u0000 <mi>R</mi>\u0000 <mi>Y</mi>\u0000 </mrow>\u0000 <annotation>$CRY$</annotation>\u0000 </semantics></math> gates and later retrieve them through a controlled-SWAP, guaranteeing unitary reversibility. A single imprint–retrieval cycle attains a hardware fidelity of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>0.73</mn>\u0000 <mo>±</mo>\u0000 <mn>0.01</mn>\u0000 </mrow>\u0000 <annotation>$0.73pm 0.01$</annotation>\u0000 </semantics></math>; prepending the same layer to a conventional <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>[</mo>\u0000 <mn>3</mn>\u0000 <mo>,</mo>\u0000 <mn>1</mn>\u0000 <mo>,</mo>\u0000 <mn>3</mn>\u0000 <mo>]</mo>\u0000 </mrow>\u0000 <annotation>$[3,1,3]$</annotation>\u0000 </semantics></math> repetition code boosts the logical fidelity to <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>0.941</mn>\u0000 <mo>±</mo>\u0000 <mn>0.004</mn>\u0000 </mrow>\u0000 <annotation>$0.941pm 0.004$</annotation>\u0000 </semantics></math> - a 32 % improvement obtained without additional CX gates. Incorporating the layer into a variational quantum classifier lowers the final training loss by 35 % and halves run-to-run variance, evidencing its value for hybrid quantum-classical workloads. Noise-calibrated simulations further show that stacking three QMM layers brings the logical error rate to within 20 % of a distance-three surface code while using an order of magnitude fewer qubits. Because the QMM booster is fully unitary and eschews mid-circuit measurement, it is directly compatible with platforms where rapid stabilizer read-out is impractical and provides empirical support for the broader notion that space-time itself may behave as a distributed quantum memory.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 9","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202500262","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057801","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 Novel Co-Magnetometer Based on Double-Probe in Situ Decoupling of Magnetic Field and Inertia Rotation","authors":"Ye Liu,&nbsp;Wenfeng Fan,&nbsp;Yao Liu,&nbsp;Jiale Quan,&nbsp;Haoying Pang,&nbsp;Xin Wang,&nbsp;Longyan Ma,&nbsp;Wei Quan","doi":"10.1002/qute.202500253","DOIUrl":"10.1002/qute.202500253","url":null,"abstract":"<p>Magnetic noise and other magnetic system effects have been major factors hindering accurate measurements of exotic spin interactions. The atomic co-magnetometer uses the different spin collisions of various substances to suppress magnetic field interference and magnetic noise. However, the current suppression of magnetic noise and magnetic field interference only involves passive shielding and parameter adjustment. Here, a novel in-situ magnetic noise compensation mechanism is reported for an atomic co-magnetometer, which arises from the difference in spin polarization behavior of two alkali metals in a mixed pumping. The magnetometer, which uses the potassium-rubidium-neon-21 (K-Rb-<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msup>\u0000 <mrow></mrow>\u0000 <mn>21</mn>\u0000 </msup>\u0000 <mi>Ne</mi>\u0000 </mrow>\u0000 <annotation>$^{21}{rm Ne}$</annotation>\u0000 </semantics></math>) system, successfully decouples the magnetic fields and inertial rotations in situ. In addition, this new paramagnetic system can be used to simultaneously measure the magnetic field and inertial rotations, improving the stability of the measurement. These findings provide new possibilities for accurate measurements, including improving the stability of inertial rotations measurement and accessing unexplored parameter spaces.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144833048","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":"One-Way Network Nonlocality of Continuous Variable Entangled Networks","authors":"Jun-Li Jiang,&nbsp;Xin-Zhu Liu,&nbsp;Xue Yang,&nbsp;Xiuyong Ding,&nbsp; Da Zhang,&nbsp;Ming-Xing Luo","doi":"10.1002/qute.202500147","DOIUrl":"10.1002/qute.202500147","url":null,"abstract":"<p>Nonlocality is a key feature of quantum networks and is being studied for its potential applications in quantum communication and computing. Understanding and harnessing nonlocality in quantum networks can lead to the development of faster and more secure communication systems. All the nonclassicalities are limited to discrete variable quantum networks. The first method is proposed to verify the network nonlocality of all optical quantum network consisting of two entangled states where one-way classical communication is allowed. This provides the first device-independent method to verify the quantum correlations generated from all optical continuous-variable quantum networks.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144833049","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":"Modeling of Assignment Problem in Quantum Approximate Optimization Algorithm","authors":"Arnab Roy,&nbsp;Nongmeikapam Brajabidhu Singh,&nbsp;Anish Kumar Saha","doi":"10.1002/qute.202400364","DOIUrl":"10.1002/qute.202400364","url":null,"abstract":"<p>An assignment problem is a mapping between the tasks and agents aiming for the optimal cost. In graph theory, it is represented by a bipartite graph of tasks and agents connected optimally through edges. It is a combinatorial optimization, a type of NP category that makes it hard to solve in a limited time for large inputs. Quantum approximate optimization algorithm (QAOA), a hybrid-quantum optimization, is a possible way to solve such combinatorial problems in quantum computing. Quantum computation exploits the theory of quantum physics for accelerated computation. In this study, the assignment problem is framed to quadratic unconstrained binary optimization and the Ising model for the execution in QAOA. The details of classical to quantum conversion, modeling, circuit implementation, and various analyses are explained with an example.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 7","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635632","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":"Extreme Plasmons (Adv. Quantum Technol. 6/2025)","authors":"Aakash A. Sahai","doi":"10.1002/qute.202570012","DOIUrl":"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":4.3,"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":"10.1002/qute.202570013","url":null,"abstract":"","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.3,"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":"Research on the Phenomenon of Mode Separation Based on Characteristic Mode Analysis and Its Application in the Design of Metasurface Antennas","authors":"Chun Ni,&nbsp;Hui Wang,&nbsp;Chenlu Li,&nbsp;Yiying Wang,&nbsp;Xiaojing Kuang,&nbsp;Meng Kong,&nbsp;Rugang Hu,&nbsp;Liang Zhang","doi":"10.1002/qute.202500124","DOIUrl":"10.1002/qute.202500124","url":null,"abstract":"<p>During the process of characteristic mode analysis on metasurfaces, an intriguing phenomenon is observed: when the unit cells exhibit 90-degree rotational symmetry, the two fundamental modes of the metasurface nearly completely overlap in the frequency domain. However, when the structure of the unit cells lacks 90-degree rotational symmetry, the two fundamental modes become separated. This phenomenon can be termed modal separation. Research reveals that the cause of modal separation is the alteration of the modal current paths for the two fundamental modes. This discovery provides a novel perspective for designing broadband metasurface antennas. Based on this theory, a broadband circularly polarized metasurface antenna is designed. To successfully excite the two modes that are significantly separated in the frequency domain, a stepped coplanar waveguide (CPW)-feed radiator is devised. The proposed metasurface antenna is fabricated and measured, with dimensions of 0.42λ_L × 0.42λ_L × 0.045λ_L (λ_L is the wavelength in free space at the lowest operating frequency). The measured results show that the antenna has an impedance bandwidth of 4.2–8.3 GHz (65.6%), a 3 dB axial ratio bandwidth of 5.2–6.8 GHz (26.7%), and a peak gain of 5.83 dBi.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 7","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144646984","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":"Deterministic Fabrication of GaAs-Quantum-Dot Micropillar Single-Photon Sources","authors":"Abdulmalik A. Madigawa,&nbsp;Martin Arentoft Jacobsen,&nbsp;Claudia Piccinini,&nbsp;Paweł Wyborski,&nbsp;Ailton Garcia Jr.,&nbsp;Saimon F. Covre da Silva,&nbsp;Armando Rastelli,&nbsp;Battulga Munkhbat,&nbsp;Niels Gregersen","doi":"10.1002/qute.202500128","DOIUrl":"10.1002/qute.202500128","url":null,"abstract":"<p>This study investigates the performance of droplet-etched GaAs quantum dots (QDs) integrated into micropillar structures using a deterministic fabrication technique. A unity QD positioning yield across 74 devices and consistent device performanceare demonstrated. Under p-shell excitation, the QD decay dynamics within the micropillars exhibit biexponential behavior, accompanied by intensity fluctuations limiting the source efficiency to &lt; 4.5%. Charge stabilization via low-power above-band LED excitation effectively reduces these fluctuations, doubling the source efficiency to <span></span><math>\u0000 <semantics>\u0000 <mo>∼</mo>\u0000 <annotation>$sim$</annotation>\u0000 </semantics></math> 9%. Moreover, suppression of radiation modes is introduced by implementing cylindrical rings theoretically predicted to boost the collection efficiency by a factor of 4. Experimentally, only a modest improvement is obtained, underscoring the influence of even minor fabrication imperfections for this advanced design. These findings demonstrate the reliability of the deterministic fabrication approach in producing high-yield, uniform devices, while offering detailed insights into the influence of charge noise and complex relaxation dynamics on the performance.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://advanced.onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202500128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832455","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}