EPJ Quantum Technology最新文献_第4页

From computing to quantum mechanics: accessible and hands-on quantum computing education for high school students 从计算到量子力学：面向高中生的无障碍量子计算实践教育

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-09-11 DOI: 10.1140/epjqt/s40507-024-00271-9

Qihong Sun, Shuangxiang Zhou, Ronghang Chen, Guanru Feng, King Tai Cheung, Jensen Li, Shi-Yao Hou, Bei Zeng

{"title":"From computing to quantum mechanics: accessible and hands-on quantum computing education for high school students","authors":"Qihong Sun, Shuangxiang Zhou, Ronghang Chen, Guanru Feng, King Tai Cheung, Jensen Li, Shi-Yao Hou, Bei Zeng","doi":"10.1140/epjqt/s40507-024-00271-9","DOIUrl":"10.1140/epjqt/s40507-024-00271-9","url":null,"abstract":"<div><p>This paper outlines an alternative approach to teaching quantum computing at the high school level, tailored for students with limited prior knowledge in advanced mathematics and physics. This approach diverges from traditional methods by building upon foundational concepts in classical computing before gradually introducing quantum mechanics, thereby simplifying the entry into this complex field. The course was initially implemented in a program for gifted high school students under the Hong Kong Education Bureau and received encouraging feedback, indicating its potential effectiveness for a broader student audience. A key element of this approach is the practical application through portable NMR quantum computers, which provides students with hands-on experience. The paper describes the structure of the course, including the organization of the lectures, the integration of the hardware of the portable nuclear magnetic resonance (NMR) quantum computers, the Gemini/Triangulum series, and detailed lecture notes in Additional file 1. The initial success in the specialized program and ongoing discussions to expand the course to regular high schools in Hong Kong and Shenzhen suggest the viability of this approach for wider educational application. By focusing on accessibility and student engagement, this approach presents a valuable perspective on introducing quantum computing concepts at the high school level, aiming to enhance student understanding and interest in the field.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00271-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142169811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient quantum secure multi-party greatest common divisor protocol and its applications in private set operations 高效量子安全多方最大公约数协议及其在私有集合运算中的应用

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-09-09 DOI: 10.1140/epjqt/s40507-024-00268-4

Zi-Xian Li, Wen-Jie Liu, Bing-Mei Su

{"title":"Efficient quantum secure multi-party greatest common divisor protocol and its applications in private set operations","authors":"Zi-Xian Li, Wen-Jie Liu, Bing-Mei Su","doi":"10.1140/epjqt/s40507-024-00268-4","DOIUrl":"10.1140/epjqt/s40507-024-00268-4","url":null,"abstract":"<div><p>Private set intersection (PSI) has important application value, however, current quantum PSI protocols are either unsuitable for multi-party scenarios or inefficient. Recently, Imran (arXiv:2303.17196v3, 2023) proposed two quantum secure multi-party greatest common divisor (GCD) protocols that can be used for PSI, but with the downside of information leakage and resource consumption. In this paper, we propose a novel quantum secure multi-party GCD protocol that has higher security and lower complexity. To hide privacy, each party randomly selects a coefficient within a range determined by his input integer, and with the assistance of a semi-honest third party TP, all parties secretly calculate the linear combination of their inputs under these coefficients. Once enough linear combinations are collected, TP calculates the GCD of these combinations, which is equal to the GCD of all input integers. To verify the honesty of participants, a quantum zero-knowledge proof sub-protocol is designed. Analysis shows that our GCD protocol is correct and has security against malicious attacks. Moreover, its complexity is polynomial level and lower than Imran’s. Furthermore, we demonstrate the scalability of our GCD protocol in private set operations, such as private set intersection, private set intersection cardinality, private multi-set intersection, etc.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00268-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Superconducting surface trap chips for microwave-driven trapped ions 用于微波驱动被俘离子的超导表面阱芯片

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-09-09 DOI: 10.1140/epjqt/s40507-024-00269-3

Yuta Tsuchimoto, Ippei Nakamura, Shotaro Shirai, Atsushi Noguchi

{"title":"Superconducting surface trap chips for microwave-driven trapped ions","authors":"Yuta Tsuchimoto, Ippei Nakamura, Shotaro Shirai, Atsushi Noguchi","doi":"10.1140/epjqt/s40507-024-00269-3","DOIUrl":"10.1140/epjqt/s40507-024-00269-3","url":null,"abstract":"<div><p>Microwave-driven trapped ion logic gates offer a promising avenue for advancing beyond laser-based logic operations. In future microwave-based operations, however, the joule heat produced by large microwave currents flowing through narrow microwave electrodes would potentially hinder improvements in gate speed and fidelity. Moreover, scalability, particularly in cryogenic trapped ion systems, is impeded by the excessive joule heat. To address these challenges, we present a novel approach: superconducting surface trap chips that integrate high-<i>Q</i> microwave resonators with large current capacities. Utilizing sub-ampere microwave currents in superconducting Nb resonators, we generate substantial magnetic field gradients with significantly reduced losses compared to conventional metal chips. By harnessing the high <i>Q</i> factors of superconducting resonators, we propose a power-efficient two-qubit gate scheme capable of achieving a sub-milliwatt external microwave input power at a gate Rabi frequency of 1 kHz.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00269-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Continuous evolution for efficient quantum architecture search 高效量子架构搜索的持续演化

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-09-06 DOI: 10.1140/epjqt/s40507-024-00265-7

QuanGong Ma, ChaoLong Hao, XuKui Yang, LongLong Qian, Hao Zhang, NianWen Si, MinChen Xu, Dan Qu

{"title":"Continuous evolution for efficient quantum architecture search","authors":"QuanGong Ma, ChaoLong Hao, XuKui Yang, LongLong Qian, Hao Zhang, NianWen Si, MinChen Xu, Dan Qu","doi":"10.1140/epjqt/s40507-024-00265-7","DOIUrl":"10.1140/epjqt/s40507-024-00265-7","url":null,"abstract":"<div><p>Variational quantum algorithms (VQAs) have been successfully applied to quantum approximate optimization algorithms, variational quantum compiling, and quantum machine learning models. The performance of VQAs is significantly influenced by the architecture of parameterized quantum circuits (PQCs). Quantum architecture search aims to automatically discover high-performance quantum circuits for specific VQA tasks. Quantum architecture search algorithms that utilize both SuperCircuit training and a parameter-sharing approach can save computational resources. If we directly follow the parameter-sharing approach, the SuperCircuit has to be trained to compensate for the worse search space. To address the challenges posed by the worse search space, we introduce an optimization strategy known as the efficient continuous evolutionary approach using Non-dominated Sorting Genetic Algorithm-II (NSGA-II). Then, we leverage prior information (symmetric property) designing Structure Symmetric Pruning for removing redundant gates of the searched ansatz. Experiments show that the efficient continuous evolutionary approach can search for more quantum architectures with better performance; the number of high-performance ansatzes obtained by our method is 10% higher than that in the literature (Du et al. in npj Quantum Inf. 8:62, 2022). The application of Structure Symmetric Pruning effectively reduces the number of parameters in quantum circuits without compromising their performance significantly. In binary classification tasks, the pruned quantum circuits exhibit an average accuracy reduction of 0.044 compared to their unpruned counterparts.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00265-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142143864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prior entanglement exponentially improves one-server quantum private information retrieval for quantum messages 先验纠缠可指数级提高量子信息的单服务器量子私人信息检索能力

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-09-06 DOI: 10.1140/epjqt/s40507-024-00266-6

Seunghoan Song, François Le Gall, Masahito Hayashi

引用次数: 0

Fully controllable time-bin entangled states distributed over 100-km single-mode fibers 分布在 100 千米单模光纤上的完全可控的时间束纠缠态

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-09-04 DOI: 10.1140/epjqt/s40507-024-00267-5

Jinwoo Kim, Jiho Park, Hong-Seok Kim, Guhwan Kim, Jin Tae Kim, Jaegyu Park, Kiwon Moon, Seung-Chan Kwak, Min-su Kim, Jung Jin Ju

{"title":"Fully controllable time-bin entangled states distributed over 100-km single-mode fibers","authors":"Jinwoo Kim, Jiho Park, Hong-Seok Kim, Guhwan Kim, Jin Tae Kim, Jaegyu Park, Kiwon Moon, Seung-Chan Kwak, Min-su Kim, Jung Jin Ju","doi":"10.1140/epjqt/s40507-024-00267-5","DOIUrl":"10.1140/epjqt/s40507-024-00267-5","url":null,"abstract":"<div><p>Quantum networks that can perform user-defined protocols beyond quantum key distribution will require fully controllable entangled quantum states. To expand the available space of generated time-bin entangled states, we demonstrate a time-bin entangled photon source that produces qubit states <span>(|{psi}rangle = alpha |{00}rangle + beta |{11}rangle )</span> with fully controllable phase and amplitudes. Eight different two-photon states have been selected and prepared from arbitrary states on the reduced two-qubit Bloch sphere. The photon pairs encoded in the time-bin scheme were generated at 2.4 MHz with a visibility of <span>(V = 0.9475 pm 0.0016)</span>, with a violation of the CHSH Bell’s inequality by 197 standard deviations. After entanglement distribution over 100 km of single-mode fibers, we obtained a visibility of <span>(V = 0.9541 pm 0.0113)</span> with a violation of the CHSH Bell’s inequality by 6 standard deviations. The prepared states had an average fidelity of <span>(0.9540 pm 0.0016)</span> at the source and an average fidelity of <span>(0.9353 ^{+0.0100}_{-0.0209})</span> after entanglement distribution, which shows that the quantum states generated by our time-bin entangled photon source can be fully controlled potentially to a level applicable to long-distance advanced quantum network systems.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00267-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142130323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exponential qubit reduction in optimization for financial transaction settlement 金融交易结算优化中的指数比特缩减

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-08-14 DOI: 10.1140/epjqt/s40507-024-00262-w

Elias X. Huber, Benjamin Y. L. Tan, Paul R. Griffin, Dimitris G. Angelakis

{"title":"Exponential qubit reduction in optimization for financial transaction settlement","authors":"Elias X. Huber, Benjamin Y. L. Tan, Paul R. Griffin, Dimitris G. Angelakis","doi":"10.1140/epjqt/s40507-024-00262-w","DOIUrl":"10.1140/epjqt/s40507-024-00262-w","url":null,"abstract":"<div><p>We extend the qubit-efficient encoding presented in (Tan et al. in Quantum 5:454, 2021) and apply it to instances of the financial transaction settlement problem constructed from data provided by a regulated financial exchange. Our methods are directly applicable to any QUBO problem with linear inequality constraints. Our extension of previously proposed methods consists of a simplification in varying the number of qubits used to encode correlations as well as a new class of variational circuits which incorporate symmetries thereby reducing sampling overhead, improving numerical stability and recovering the expression of the cost objective as a Hermitian observable. We also propose optimality-preserving methods to reduce variance in real-world data and substitute continuous slack variables. We benchmark our methods against standard QAOA for problems consisting of 16 transactions and obtain competitive results. Our newly proposed variational ansatz performs best overall. We demonstrate tackling problems with 128 transactions on real quantum hardware, exceeding previous results bounded by NISQ hardware by almost two orders of magnitude.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00262-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141980181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonclassical light in a three-waveguide coupler with second-order nonlinearity 具有二阶非线性的三波导耦合器中的非经典光

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-08-14 DOI: 10.1140/epjqt/s40507-024-00263-9

Mohd Syafiq M. Hanapi, Abdel-Baset M. A. Ibrahim, Rafael Julius, Pankaj K. Choudhury, Hichem Eleuch

{"title":"Nonclassical light in a three-waveguide coupler with second-order nonlinearity","authors":"Mohd Syafiq M. Hanapi, Abdel-Baset M. A. Ibrahim, Rafael Julius, Pankaj K. Choudhury, Hichem Eleuch","doi":"10.1140/epjqt/s40507-024-00263-9","DOIUrl":"10.1140/epjqt/s40507-024-00263-9","url":null,"abstract":"<div><p>Possible squeezed states generated in a three-waveguide nonlinear coupler operating with second harmonic generation is discussed. This study is carried out using two well-known techniques; the phase space method (based on positive-P representation) and the Heisenberg-based analytical perturbative (AP) method. The effects of key design parameters were investigated under various conditions, including full frequency matching, symmetrical and asymmetrical waveguide initialization, and both codirectional and contr-adirectional propagation. The system consistently produced long-lasting oscillatory squeezed states across all three waveguides, even when only one waveguide was pumped with coherent light while the others were in a vacuum state. Also, the performance and capacities of both methods are critically evaluated. For low levels of key design parameters and in the early stages of evolution, a high level of agreement between the two methods is noticed. In the new era of quantum-based technology, the proposed system opens a new avenue for utilising nonlinear couplers in nonclassical light generation.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00263-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141980183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient quantum state estimation with low-rank matrix completion 利用低秩矩阵补全实现高效量子态估计

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-08-05 DOI: 10.1140/epjqt/s40507-024-00261-x

Shehbaz Tariq, Ahmad Farooq, Junaid Ur Rehman, Trung Q. Duong, Hyundong Shin

{"title":"Efficient quantum state estimation with low-rank matrix completion","authors":"Shehbaz Tariq, Ahmad Farooq, Junaid Ur Rehman, Trung Q. Duong, Hyundong Shin","doi":"10.1140/epjqt/s40507-024-00261-x","DOIUrl":"10.1140/epjqt/s40507-024-00261-x","url":null,"abstract":"<div><p>This paper introduces a novel and efficient technique for quantum state estimation, coined as low-rank matrix-completion quantum state tomography for characterizing pure quantum states, as it requires only non-entangling bases and <span>(2n + 1)</span> local Pauli operators. This significantly reduces the complexity of the process and increases the accuracy of the state estimation, as it eliminates the need for the entangling bases, which are experimentally difficult to implement on quantum devices. The required minimal post-processing, improved accuracy and efficacy of this matrix-completion-based method make it an ideal benchmarking tool for investigating the properties of quantum systems, enabling researchers to verify the accuracy of quantum devices, characterize their performance, and explore the underlying physics of quantum phenomena. Our numerical results demonstrate that this method outperforms contemporary techniques in its ability to accurately reconstruct multi-qubit quantum states on real quantum devices, making it an invaluable contribution to the field of quantum state characterization and an essential step toward the reliable deployment of intermediate- and large-scale quantum devices.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00261-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental demonstration of quantum encryption in phase space with displacement operator in coherent optical communications 相干光通信中带有位移算子的相空间量子加密实验演示

IF 5.8 2区物理与天体物理

EPJ Quantum Technology Pub Date : 2024-07-31 DOI: 10.1140/epjqt/s40507-024-00260-y

Mostafa Khalil, Adrian Chan, David V. Plant, Lawrence R. Chen, Randy Kuang

{"title":"Experimental demonstration of quantum encryption in phase space with displacement operator in coherent optical communications","authors":"Mostafa Khalil, Adrian Chan, David V. Plant, Lawrence R. Chen, Randy Kuang","doi":"10.1140/epjqt/s40507-024-00260-y","DOIUrl":"10.1140/epjqt/s40507-024-00260-y","url":null,"abstract":"<div><p>We provide experimental validation of quantum encryption in phase space using displacement operators in coherent states (DOCS) in a conventional coherent optical communication system. The proposed encryption technique is based on displacing the information symbols in the phase space using random phases and amplitudes to achieve encryption randomly and provide security at the physical layer. We also introduce a dual polarization encryption approach where we use two different and random DOCS to encrypt the X and Y polarizations separately. The experimental results show that only authorized users can decrypt the signal correctly, and any mismatch in the displacement operator coefficients, amplitudes, or phases will lead to a bit error ratio (BER) of approximately 50%. We also compare the performance of the system with and without encryption over 80 km of standard-single mode fiber (SSMF) transmission to assess the added penalty of such encryption. The achieved net bit rates are 224, 448, and 560 Gb/s for QPSK, 16QAM, and 32QAM modulation formats, respectively. The experimental results showcase the efficacy of the DOCS encryption technique in resisting various decryption attempts, demonstrating its effectiveness in ensuring the security and confidentiality of transmitted data in a real-world transmission scenario.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00260-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141867525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0