Advanced quantum technologies最新文献

{"title":"Tunable Two-Axis Twist Interaction of Multiple Spins Using Two-Phonon Drive in a Spin-Mechanical System","authors":"Di-Jia Zhang,&nbsp;Yi-Fan Qiao,&nbsp;Xiao-Yu Yao,&nbsp;Jia-Qiang Chen,&nbsp;Xue-Feng Pan,&nbsp;Yu-Meng Ren,&nbsp;Jun-Cong Zheng,&nbsp;Xing-Liang Dong,&nbsp;Xin-Lei Hei,&nbsp;Peng-Bo Li","doi":"10.1002/qute.202400442","DOIUrl":"https://doi.org/10.1002/qute.202400442","url":null,"abstract":"<p>Spin-spin interactions play an important role in quantum computing and quantum metrology. Here a simple scheme is proposed to control the induced spin-spin interactions in a spin-mechanical hybrid system, where a tunable two-phonon drive without a complex nonlinear process can be easily acquired. In this scheme, the nitrogen-vacancy (NV) centers are coupled to a mechanical cantilever through either magnetic gradient or strain coupling. Through modulating the spring constant of the mechanical cantilever with a time-dependent pump, an intrinsic nonlinear drive can be acquired and the interaction of the NV spins can be easily controlled using the adjustable two-axis twist (TAT) Hamiltonian. This proposal needs neither additional nonlinear resources nor optical pumping and driving of multi-level atoms, which tremendously facilitates the experimental realization of this scheme. Then, the TAT Hamiltonian is used to achieve the Heisenberg-limited spin squeezing. The considered dissipations will not interfere the generation of squeezed spin states. Besides, it is found that the spin squeezing is robust against the variation of the parameters in the system. This scheme can make it feasible to generate the interaction between spins in solid-state spin-phonon systems.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273141","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 Key Recovery Attacks On Prøst-COPA and Prøst-OTR Using Simon's Algorithm","authors":"Wen-Jie Liu,&nbsp;Yuan-Yuan Zhang","doi":"10.1002/qute.202400327","DOIUrl":"https://doi.org/10.1002/qute.202400327","url":null,"abstract":"<p>Due to its innovative and performance advantages, Prøst-COPA and Prøst-OTR have attracted widespread attention. For the Prøst-COPA without associated data and with associated data, the corresponding quantum key recovery attacks are proposed using Simon's algorithm, respectively. In the first scenario, the messages are used to calculate the Message Authentication Code (MAC) and construct a period function to recover the secret parameter <span></span><math>\u0000 <semantics>\u0000 <mi>L</mi>\u0000 <annotation>$L$</annotation>\u0000 </semantics></math>. Then, utilizing ciphertext, a periodic function is constructed with a periodic value equal to the key value. MAC is calculated from messages and the associated data in the second scenario. Considering the impact of the associated data on the periodicity of the function, the messages are treated as a constant and further construct two periodic functions to recover the secret parameter <span></span><math>\u0000 <semantics>\u0000 <mi>L</mi>\u0000 <annotation>$L$</annotation>\u0000 </semantics></math> and the key. For Prøst-OTR, by constructing two periodic functions using two tags with different numbers of message blocks, the secret parameter <span></span><math>\u0000 <semantics>\u0000 <mi>L</mi>\u0000 <annotation>$L$</annotation>\u0000 </semantics></math> can be recovered, and then the key can be recovered using Simon's algorithm. Compared to the classical attacks, the quantum-based methods only require <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>O</mi>\u0000 <mo>(</mo>\u0000 <mi>n</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$O(n)$</annotation>\u0000 </semantics></math> quantum queries (where <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>2</mn>\u0000 <mi>n</mi>\u0000 </mrow>\u0000 <annotation>$2n$</annotation>\u0000 </semantics></math> is the message block size), resulting in an exponential speed acceleration and the success probability of the method is close to 1. These methods also show a lower query complexity than the state-of-the-art quantum methods.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273420","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":"Multi-Party Semi-Quantum Private Comparison Protocol of Size Relation with d-Level GHZ States","authors":"Nan-Run Zhou,&nbsp;Zhen-Yong Chen,&nbsp;Yan-Yan Liu,&nbsp;Li-Hua Gong","doi":"10.1002/qute.202400530","DOIUrl":"https://doi.org/10.1002/qute.202400530","url":null,"abstract":"<p>A new multi-party semi-quantum private comparison protocol of size relation is designed based on <i>d</i>-level GHZ states. Multiple classical participants could compare their privacies while keeping them secure under an ideal environment. Compared with some similar protocols, the classical participants in the designed protocol do not need to prepare and measure quantum states. Besides, the qubit efficiency of the protocol reaches 33.33%. It is demonstrated that the output result of the proposed protocol is correct. Finally, security analysis manifests that the proposed protocol behaves well in withstanding intercept-resend attack, measure-resend attack, entanglement attack, Trojan horse attack, and so on.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273080","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":"Direct Purification of Bell and Multipartite GHZ States via Weak Measurement","authors":"Sajede Harraz,&nbsp;Shuang Cong","doi":"10.1002/qute.202400450","DOIUrl":"https://doi.org/10.1002/qute.202400450","url":null,"abstract":"<p>Maximally entangled states are crucial for various quantum information processing, yet their quality suffers from entanglement loss due to decoherence. In this paper, a direct purification technique that utilizes weak measurement and requires only two copies of the entangled state is proposed. The method involves transforming the damped entangled state with weak measurements and then applying a direct purification process. This approach yields a maximally entangled state with a certain probability. In the context of Bell state purification, two weak measurement-based operations designed to convert amplitude-damped Bell states into the desired state for direct purification method are presented. The first operation is applied prior to the noisy channel, while the second is employed after the noisy channel. Through comprehensive analysis, the performances of these two schemes are evaluated and compared and benchmarked them against a pioneering weak measurement-based scheme. The findings demonstrate that the proposed methods exhibit superior performance in terms of both fidelity and probability. Additionally, a novel technique for purifying multipartite amplitude-damped Greenberger–Horne–Zeilinger (GHZ) states is introduced, which existing methods cannot address. By employing only two copies of the entangled states and harnessing the unique advantages of weak measurement operations, the method achieves both resource efficiency and effectiveness.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273079","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":"Qoolchain: A QUBO Preprocessing Toolchain for Enhancing Quantum Optimization","authors":"Giacomo Orlandi,&nbsp;Deborah Volpe,&nbsp;Mariagrazia Graziano,&nbsp;Giovanna Turvani","doi":"10.1002/qute.202400384","DOIUrl":"https://doi.org/10.1002/qute.202400384","url":null,"abstract":"<p>Solving combinatorial optimization problems is crucial in research and industry but still challenging since these problems are usually NP-hard or NP-complete. Classical solvers struggle with their non-polynomial complexity. Although heuristic algorithms are widely used, they often fall short in execution time and accuracy, increasing the interest in quantum computing alternatives using Quadratic Unconstrained Binary Optimization (QUBO) formulations. However, current Noisy Intermediate-Scale Quantum (NISQ) computers and future early fault-tolerant quantum devices face limitations in qubit availability and circuit depth, necessitating preprocessing to reduce problem complexity. This study introduces Qoolchain, a QUBO preprocessing toolchain designed to reduce problem size and enhance solver performance. Developed in Cython, Qoolchain is compatible with major quantum frameworks and optimized for the Grover Adaptive Search (GAS) algorithm. It includes steps like persistency identification, decomposition, and probing to estimate function bounds, all with polynomial complexity. Qoolchain also proposes using the Grover Search algorithm for problem segments whose optimal value is known a priori from graph theory and Shannon decomposition to reduce QUBO problem complexity further. Evaluated against the D-Wave preprocessing toolchain on various problems, Qoolchain demonstrates higher efficiency and accuracy. It represents a significant advancement in enabling practical quantum solvers, addressing hardware limitations, and solving complex industry-relevant problems.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 5","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202400384","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944754","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":"Hybrid of Gradient Descent and Semidefinite Programming for Certifying Multipartite Entanglement Structure","authors":"Kai Wu,&nbsp;Zhihua Chen,&nbsp;Zhen-Peng Xu,&nbsp;Zhihao Ma,&nbsp;Shao-Ming Fei","doi":"10.1002/qute.202400443","DOIUrl":"https://doi.org/10.1002/qute.202400443","url":null,"abstract":"<p>Multipartite entanglement is a crucial resource for a wide range of quantum information processing tasks, including quantum metrology, quantum computing, and quantum communication. The verification of multipartite entanglement, along with an understanding of its intrinsic structure, is of fundamental importance, both for the foundations of quantum mechanics and for the practical applications of quantum information technologies. Nonetheless, detecting entanglement structures remains a significant challenge, particularly for general states and large-scale quantum systems. To address this issue, an efficient algorithm that combines semidefinite programming with a gradient descent method is developed. This algorithm is designed to explore the entanglement structure by examining the inner polytope of the convex set that encompasses all states sharing the same entanglement properties. Through detailed examples, it is demonstrated that the superior performance of this approach compared to many of the best-known methods available today. This method not only improves entanglement detection but also provides deeper insights into the complex structures of many-body quantum systems, which is essential for advancing quantum technologies.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273447","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 Network Infrastructure","authors":"Lisa Wörner,&nbsp;Kai Bongs,&nbsp;Stefanie Bremer,&nbsp;Philipp Kleinpaß,&nbsp;Florian Moll,&nbsp;Davide Orsucci,&nbsp;Jaspar Meister,&nbsp;Jan-Michael Mol","doi":"10.1002/qute.202300415","DOIUrl":"https://doi.org/10.1002/qute.202300415","url":null,"abstract":"<p>Global quantum state distribution has applications in many areas, one of which is global key distribution for secure communications in an era of the threat of quantum computing. Long-distance quantum key distribution requires a global network of optical relay stations, ground stations, and quantum memories. In this study, why quantum memories should be operated in space as untrusted nodes is presented. In addition to quantum key distribution, quantum memories in space are an enabling technology for distributed quantum sensor systems. The requirements for distributed sensors are outlined and the current technology readiness level of relevant systems is referenced. Finally, the possibility of an emerging quantum internet, enabling the coherent combination of quantum computers around the world, is addressed.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202300415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389373","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":"Tunable Chern Number and Sizable Bandgap in Kagome-Honeycomb-Triangle Latticed Quantum Anomalous Hall Insulator","authors":"Huijie Lian,&nbsp;Xiaokang Xu,&nbsp;Jinlian Lu,&nbsp;Xue Rui,&nbsp;Lu Qi,&nbsp;Xiaojing Yao,&nbsp;Ailei He,&nbsp;Xiuyun Zhang","doi":"10.1002/qute.202400444","DOIUrl":"https://doi.org/10.1002/qute.202400444","url":null,"abstract":"<p>The search of 2D magnetic materials with quantum anomalous Hall (QAH) effect is a fascinating topic in the field of condensed matter physics, which holds great promise for topological quantum computing. This work proposes that Kagome-Honeycomb-Triangle lattice Cr₃O₄Cl monolayer represents a class of ferromagnetic Weyl half-metal with high Curie temperature. Upon considering the spin-orbit coupling (SOC) effect, the Weyl point is broken and a topologically nontrivial gap of 101.96 meV is opened. Under biaxial tensile strain, the Cr₃O₄Cl monolayer is transformed from QAH metal to QAH insulator with Chern number C = 1. Remarkably, a Chern number phase transition from C = 1 to C = 3 can be achieved via manipulating the hole concentration of 1.05 holes per unit cell. This work proposes a platform for realizing 2D high Chern number QAH effect for practical applications.</p>","PeriodicalId":72073,"journal":{"name":"Advanced quantum technologies","volume":"8 6","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273499","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. 12/2024)","authors":"","doi":"10.1002/qute.202470038","DOIUrl":"https://doi.org/10.1002/qute.202470038","url":null,"abstract":"","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.202470038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868355","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":"Front Cover: Laser Beam Induced Charge Collection for Defect Mapping and Spin State Readout in Diamond (Adv. Quantum Technol. 12/2024)","authors":"Dominic Reinhardt,&nbsp;Julia Heupel,&nbsp;Cyril Popov,&nbsp;Ralf Wunderlich","doi":"10.1002/qute.202470035","DOIUrl":"https://doi.org/10.1002/qute.202470035","url":null,"abstract":"<p>Photocurrents in wide bandgap materials provide valuable insights into the dynamics of intrinsic defects. In article number 2400237, Ralf Wunderlich and co-workers use a commercially available charge integrator IC with switchable input on a printed circuit board (cover image) for low-noise current measurements with a resolution of about 100 fA. Thus, the authors can image and detect small numbers of individual defects in ultrapure diamond. Furthermore, the authors conduct photocurrent-detected magnetic resonance (PDMR) on NV centers. The work paves the way for low-cost, miniaturized, simple and time-resolved photocurrent measurements of solid-state defects.\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.202470035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868346","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}