{"title":"Starting a new era for quantum technologies: In conversation with the deputy EiCs and the managing editor","authors":"Ruiqi Liu, Haris Pervaiz, Sophie Robinson","doi":"10.1049/qtc2.12108","DOIUrl":"https://doi.org/10.1049/qtc2.12108","url":null,"abstract":"<p>First of all, we want to thank all of our readers, authors and reviewers on behalf of the editing team behind <i>IET Quantum Communication</i> for your support ever since the creation of this journal in 2019.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"197"},"PeriodicalIF":2.5,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174126","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":"Guest Editorial: Quantum industry: Applications in quantum communication (Quantum.Tech Europe 2022)","authors":"Debashis De, Andrew Lord","doi":"10.1049/qtc2.12104","DOIUrl":"https://doi.org/10.1049/qtc2.12104","url":null,"abstract":"<p>Quantum technology harnesses the principles of quantum mechanics to accomplish tasks in a different way as compared to the classical technologies. This includes quantum computing, which uses qubits for parallel information processing, greatly enhancing computation speed and entanglement and empowering problem-solving abilities. Quantum communication provides secure data transmission through quantum cryptography, while quantum sensing offers improved measurement precision, benefiting areas such as cryptography, material science, and pharmaceuticals. Additionally, the implementation and commercialisation of quantum technology involve transitioning theoretical quantum concepts into practical applications and marketable products. To achieve widespread adoption of quantum industry, significant research efforts are crucial among academia, industry, and government.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"198-201"},"PeriodicalIF":2.5,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174131","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":"Advances in artificial intelligence and machine learning for quantum communication applications","authors":"Mhlambululi Mafu","doi":"10.1049/qtc2.12094","DOIUrl":"10.1049/qtc2.12094","url":null,"abstract":"<p>Artificial intelligence (AI) and classical machine learning (ML) techniques have revolutionised numerous fields, including quantum communication. Quantum communication technologies rely heavily on quantum resources, which can be challenging to produce, control, and maintain effectively to ensure optimum performance. ML has recently been applied to quantum communication and networks to mitigate noise-induced errors and analyse quantum protocols. The authors systematically review state-of-the-art ML applications to advance theoretical and experimental central quantum communication protocols, specifically quantum key distribution, quantum teleportation, quantum secret sharing, and quantum networks. Specifically, the authors survey the progress on how ML and, more broadly, AI techniques have been applied to optimise various components of a quantum communication system. This has resulted in ultra-secure quantum communication protocols with optimised key generation rates as well as efficient and robust quantum networks. Integrating AI and ML techniques opens intriguing prospects for securing and facilitating efficient and reliable large-scale communication between multiple parties. Most significantly, large-scale communication networks have the potential to gradually develop the maturity of a future quantum internet.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"202-231"},"PeriodicalIF":2.5,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698389","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}
Peide Zhang, Jaya Sagar, Elliott Hastings, Milan Stefko, Siddarth Joshi, John Rarity
{"title":"End-to-end demonstration for CubeSatellite quantum key distribution","authors":"Peide Zhang, Jaya Sagar, Elliott Hastings, Milan Stefko, Siddarth Joshi, John Rarity","doi":"10.1049/qtc2.12093","DOIUrl":"https://doi.org/10.1049/qtc2.12093","url":null,"abstract":"<p>Quantum key distribution (QKD) provides a method of ensuring security using the laws of physics, avoiding the risks inherent in cryptosystems protected by computational complexity. Here, the authors investigate the feasibility of satellite-based quantum key exchange using low-cost compact nano-satellites. The first prototype of system level quantum key distribution aimed at the Cube satellite scenario is demonstrated. It consists of a transmitter payload, a ground receiver and simulated free space channel to verify the timing and synchronisation (T&S) scheme designed for QKD and the required high loss tolerance of both QKD and T&S channels. The transmitter is designed to be deployed on various up-coming nano-satellite missions in the UK and internationally. The effects of channel loss, background noise, gate width and mean photon number on the secure key rate (SKR) and quantum bit error rate (QBER) are discussed. The authors also analyse the source of QBER and establish the relationship between effective signal noise ratio (ESNR) and noise level, signal strength, gating window and other parameters as a reference for SKR optimisation. The experiment shows that it can tolerate the 40 dB loss expected in space to ground QKD and with small adjustment decoy states can be achieved. The discussion offers valuable insight not only for the design and optimisation of miniature low-cost satellite-based QKD systems but also any other short or long range free space QKD on the ground or in the air.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"291-302"},"PeriodicalIF":2.5,"publicationDate":"2024-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174274","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}
Benjamin Kalfon, Soumaya Cherkaoui, Jean-Frédéric Laprade, Ola Ahmad, Shengrui Wang
{"title":"Successive data injection in conditional quantum GAN applied to time series anomaly detection","authors":"Benjamin Kalfon, Soumaya Cherkaoui, Jean-Frédéric Laprade, Ola Ahmad, Shengrui Wang","doi":"10.1049/qtc2.12088","DOIUrl":"https://doi.org/10.1049/qtc2.12088","url":null,"abstract":"<p>Classical GAN architectures have shown interesting results for solving anomaly detection problems in general and for time series anomalies in particular, such as those arising in communication networks. In recent years, several quantum GAN (QGAN) architectures have been proposed in the literature. When detecting anomalies in time series using QGANs, huge challenges arise due to the limited number of qubits compared to the size of the data. To address these challenges, a new high-dimensional encoding approach, named Successive Data Injection (SuDaI) is proposed. In this approach, SuDaI explores a larger portion of the quantum state, compared to the conventional angle encoding method used predominantly in the literature. This is achieved through repeated data injections into the quantum state. SuDaI encoding allows the authors to adapt the QGAN for anomaly detection with network data of a much higher dimensionality than with the existing known QGANs implementations. In addition, SuDaI encoding applies to other types of high-dimensional time series and can be used in contexts beyond anomaly detection and QGANs, opening up therefore multiple fields of application.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"269-281"},"PeriodicalIF":2.5,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174252","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}
Keaotshepha Karabo, Comfort Sekga, Connor Kissack, Mhlambululi Mafu, Francesco Petruccione
{"title":"A novel quantum key distribution resistant against large-pulse attacks","authors":"Keaotshepha Karabo, Comfort Sekga, Connor Kissack, Mhlambululi Mafu, Francesco Petruccione","doi":"10.1049/qtc2.12089","DOIUrl":"10.1049/qtc2.12089","url":null,"abstract":"<p>Quantum key distribution (QKD) offers information-theoretic security by leveraging the principles of quantum mechanics. This means the security is independent of all future advances in algorithm or computational power. However, due to the non-availability of single-photon sources, most traditional QKD protocols are vulnerable to various attacks, such as photon number-splitting (PNS) attacks. Also, the imperfections in the measuring devices open a loophole for side channels that an eavesdropper may exploit to launch attacks such as large-pulse attacks. As a result, this compromises the security of transmitted information. To address these challenges, the authors present a QKD protocol that is secure against both large-pulse attacks and PNS attacks at zero-error, in which the eavesdropper does not introduce any error, but still, the legitimate users of the system cannot distil a secure key. A notable feature of the proposed protocol is that it promotes greater robustness against both attacks than the Bennett-Brassard 1984 (BB84) protocol or the Scarani-Acin-Ribordy-Gisin 2004 (SARG04) protocol.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"282-290"},"PeriodicalIF":2.5,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844807","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 computer based feature selection in machine learning","authors":"Gerhard Hellstern, Vanessa Dehn, Martin Zaefferer","doi":"10.1049/qtc2.12086","DOIUrl":"https://doi.org/10.1049/qtc2.12086","url":null,"abstract":"<p>The problem of selecting an appropriate number of features in supervised learning problems is investigated. Starting with common methods in machine learning, the feature selection task is treated as a quadratic unconstrained optimisation problem (QUBO), which can be tackled with classical numerical methods as well as within a quantum computing framework. The different results in small problem instances are compared. According to the results of the authors’ study, whether the QUBO method outperforms other feature selection methods depends on the data set. In an extension to a larger data set with 27 features, the authors compare the convergence behaviour of the QUBO methods via quantum computing with classical stochastic optimisation methods. Due to persisting error rates, the classical stochastic optimisation methods are still superior.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"232-252"},"PeriodicalIF":2.5,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174183","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}
Antonio Macaluso, Luca Clissa, Stefano Lodi, Claudio Sartori
{"title":"An efficient quantum algorithm for ensemble classification using bagging","authors":"Antonio Macaluso, Luca Clissa, Stefano Lodi, Claudio Sartori","doi":"10.1049/qtc2.12087","DOIUrl":"10.1049/qtc2.12087","url":null,"abstract":"<p>Ensemble methods aggregate predictions from multiple models, typically demonstrating improved accuracy and reduced variance compared to individual classifiers. However, they often come with significant memory usage and computational time requirements. A novel quantum algorithm that leverages quantum superposition, entanglement, and interference to construct an ensemble of classification models using bagging as an aggregation strategy is introduced. Through the generation of numerous quantum trajectories in superposition, the authors achieve <i>B</i> transformations of the training set with only <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>log</mi>\u0000 <mfenced>\u0000 <mi>B</mi>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation> $mathit{log}left(Bright)$</annotation>\u0000 </semantics></math> operations, allowing an exponential enlargement of the ensemble size while linearly increasing the depth of the corresponding circuit. Moreover, when assessing the algorithm's overall cost, the authors demonstrate that the training of a single weak classifier contributes additively to the overall time complexity, as opposed to the multiplicative impact commonly observed in classical ensemble methods. To illustrate the efficacy of the authors’ approach, experiments on reduced real-world datasets utilising the IBM qiskit environment to demonstrate the functionality and performance of the proposed algorithm are introduced.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 3","pages":"253-268"},"PeriodicalIF":2.5,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12087","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139868937","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":"Multi-hop joint remote state preparation of general hybrid entangled multi-qudit states via distinct Einstein-Podolsky-Rosen channels","authors":"Zongyi Li, Yuzhen Wei, Min Jiang","doi":"10.1049/qtc2.12084","DOIUrl":"10.1049/qtc2.12084","url":null,"abstract":"<p>Joint Remote State Preparation provides a useful way to securely transfer the known quantum states to the distant nodes. However, the limitation of resources often leads to the quantum channels constructed by distributed entangled pairs being incompatible with the transmitted states. In order to overcome this problem, a novel Joint Remote State Preparation protocol was proposed for transmitting general multi-qudit states over quantum networks, providing a promising pathway to utilise the available Einstein-Podolsky-Rosen (EPR) channels with different levels. Several scenarios under noisy environments were discussed and some properties of the fidelity when transmitting the multi-qudit state were demonstrated. It was demonstrated that both the prepared state and the kind of the noises could restrict the number of the participant nodes. Our scheme leverages the existing quantum resources, which addresses the issue of insufficient entanglement resources. This approach is easily adaptable to other quantum network structures, offering a potential solution for constructing a universal quantum network.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 2","pages":"173-184"},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140491675","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":"Impact of fragmentation in quantum signal channel of quantum key distribution enabled optical networks","authors":"Purva Sharma, Vimal Bhatia, Shashi Prakash","doi":"10.1049/qtc2.12083","DOIUrl":"10.1049/qtc2.12083","url":null,"abstract":"<p>In QKD-enabled optical networks (QKD-enabled ONs), fragmentation is one of the serious issues which can be mitigated through appropriate management of network resources. Thus, efficient allocation of network resources during routing and resource assignment is important to minimise the impact of time slot fragmentation in the quantum signal channel (QSCh) of QKD-enabled ONs. The authors address the fragmentation problem in the QSCh and propose a new fragmentation-suppressed routing and resource assignment (FS-RRA) approach. To evaluate the performance and to analyse the effect of time slot fragmentation in QSCh of QKD-enabled ONs, the proposed FS-RRA approach is compared with two existing resource assignment approaches, namely, the first-fit (FF) and random-fit (RF) for two different networks. Simulation results show that the proposed approach reduces fragmentation by 2.97% and 6.69% for NSFNET and 1.77% and 5.91% for UBN24 in terms of external fragmentation compared to FF and RF, respectively. Furthermore, the proposed approach reduces blocking by 4.03% and 14.28% for NSFNET and 2.61% and 13.44% for UBN24 and improves resource utilisation up to 3.44% and 5.96% for NSFNET and 3.08% and 7.64% for UBN24 compared to FF and RF, respectively.</p>","PeriodicalId":100651,"journal":{"name":"IET Quantum Communication","volume":"5 2","pages":"164-172"},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/qtc2.12083","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139532928","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}