Quantum Information Processing最新文献

{"title":"Variational Monte Carlo and the Quantum Enhanced Metropolis-Hastings Algorithm","authors":"Mishka Naicker,&nbsp;Mervlyn Moodley","doi":"10.1007/s11128-026-05282-2","DOIUrl":"10.1007/s11128-026-05282-2","url":null,"abstract":"<div><p>This work explores adapting the classical Metropolis-Hastings algorithm into a quantum-enhanced framework to improve sampling efficiency in variational Monte Carlo. Utilizing variational Monte Carlo, and in particular the single-thread Monte Carlo method, we estimate the dominant eigenvalue of a symmetric 3 <span>(times )</span> 3 matrix, serving as the toy model for the ground state energy of a three-level quantum system. We compare classical and hybrid quantum-classical implementations, where the latter employs the quantum enhanced Metropolis-Hastings algorithm. In a simulated environment, the hybrid version demonstrates faster convergence and improved estimator precision for this test case.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11128-026-05282-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Novel dual-channel traveling quantum anonymous voting protocol based on Bell states","authors":"Tian Yang,&nbsp;Dong-Huan Jiang,&nbsp;Yu-Guang Yang,&nbsp;Guang-Bao Xu","doi":"10.1007/s11128-026-05280-4","DOIUrl":"10.1007/s11128-026-05280-4","url":null,"abstract":"<div><p>The traveling voting model is a commonly adopted paradigm in quantum voting protocols, where a quantum state sequentially travels among voters to encode voting information. In this paper, we propose a dual-channel traveling quantum anonymous voting protocol based on Bell states. The proposed protocol employs a dual-channel vote-splitting mechanism and a distributed tallying strategy, which reduces the reliance on a single trusted tallyman while preserving voter anonymity. After the voting process is completed, the tallyman publishes the measurement results on a bulletin board, enabling voters to verify whether the voting information has been tampered with. Security analysis demonstrates that the proposed protocol satisfies anonymity, unforgeability, and verifiability, and is resistant to common internal and external attacks.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modulation of the second-order sideband efficiency in a DPA-assisted optomechanical system","authors":"Liang-Xuan Fan,&nbsp;Tao Shui,&nbsp;Wen-Xing Yang,&nbsp;Ling Li","doi":"10.1007/s11128-026-05254-6","DOIUrl":"10.1007/s11128-026-05254-6","url":null,"abstract":"<div><p>We theoretically investigate the enhanced generation of the optical second-order sidebands (OSS) in a DPA-assisted optomechanical system. The hybrid optomechanical system is driven by a strong control field and a week probe field. Beyond the conventional linearized description of optomechanical interactions, the nonlinear interaction between the cavity field and the mechanical oscillation in this hybrid system is included in the Heisenberg–Langevin equations and is treated analytically by means of the perturbation method. In the present work, it is shown that an assisted DPA can significantly enhance the generation of the OSS. The OSS efficiency can be tuned by changing the coupling strength and phase of the DPA as well as the power of the control field. We find that the conversion efficiency of the second-order sideband in the hybrid optomechanical system with DPA is more than 10 times higher in the hybrid optomechanical system without DPA. Our device is feasible for controlling light propagation, which might have potential application in quantum optical devices and quantum information networks.\u0000</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deterministic quantum teleportation under coherent time evolution","authors":"Xuanxuan Xin,&nbsp;Hai-bo Yu,&nbsp;Chong Li","doi":"10.1007/s11128-026-05273-3","DOIUrl":"10.1007/s11128-026-05273-3","url":null,"abstract":"<div><p>Quantum teleportation is a cornerstone of quantum information science, demonstrating how nonlocal correlations enable the transfer of unknown quantum states without direct physical transport. Conventional teleportation theory typically treats the protocol as an instantaneous process, assuming both the input state and the entangled channel remain static. In realistic systems, however, both the transmitted state and the entanglement channel evolve continuously under their respective Hamiltonians. We investigate deterministic quantum teleportation under coherent time evolution and derive the conditions required for exact quantum state reconstruction in dynamically evolving systems. By incorporating subsystem Hamiltonian evolution into the teleportation process, it is shown that the reconstruction of the transmitted state is governed by the accumulated dynamical phases generated during coherent evolution. Deterministic teleportation can therefore be achieved either under specific phase-matching conditions or through state operations and measurements performed at particular evolution times. The results further reveal that, although entanglement may remain preserved during evolution, exact state reconstruction depends sensitively on the dynamical compatibility between the participating subsystems. These findings provide a dynamical perspective on quantum teleportation and clarify the role of coherent time evolution in determining exact quantum state reconstruction.\u0000</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Secure cross-domain multi-party key agreement via semi-quantum protocol with chaotic system","authors":"Chaonan Wang,&nbsp;Lu Zhang,&nbsp;Haocheng Kan,&nbsp;Peng Guo,&nbsp;Xueyan Zhang,&nbsp;Hongfeng Zhu","doi":"10.1007/s11128-026-05278-y","DOIUrl":"10.1007/s11128-026-05278-y","url":null,"abstract":"<div><p>In order to meet the growing demand for multi-party cross-domain secure communication, this paper proposes a novel multi-party cross-domain semi-quantum key agreement (SQKA) based on GHZ-like states. It aims to design a secure and economical cross-domain communication solution by combining quantum technology and chaos theory. Firstly, this paper proposes the design of a cross-domain semi-quantum structure based on quantum users, and by introducing semi-quantum nodes, the protocol not only reduces the cost of using quantum resources, but also has a small solution to the complexity of cross-domain communication in the traditional quantum key agreement. Secondly, another innovation of the protocol is the introduction of chaotic maps mechanism. The high sensitivity and unpredictability of chaotic maps make the size of the negotiated key space much larger than that of previous key protocols, which significantly improves the protocol’s anti-attack ability and the randomness of key generation. In addition, security analysis and efficiency comparison show that our protocol is secure under ideal conditions and can be realized on the basis of existing quantum technologies.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trust-free quantum internet with distributed entanglement and reconfigurable shields","authors":"Asgar Hosseinnezhad,&nbsp;Hadi Sabri","doi":"10.1007/s11128-026-05268-0","DOIUrl":"10.1007/s11128-026-05268-0","url":null,"abstract":"<div><p>The vision of a trust-free quantum internet has emerged as a critical frontier in secure communication, aiming to eliminate reliance on centralized authorities or trusted nodes. In this work, we propose a distributed entanglement relay network architecture that integrates photonic quantum channels with adaptive shielding mechanisms to mitigate noise, eavesdropping, and channel instabilities. Unlike conventional quantum key distribution (QKD) systems that depend on authenticated classical channels, our framework introduces authentication-free protocols supported by reconfigurable shields, enabling dynamic adaptation to network conditions without compromising security. By combining the principles of secure quantum relay networks and photonic quantum channels, the proposed architecture enhances scalability, resilience, and interoperability across heterogeneous infrastructures. Simulation results and theoretical analysis demonstrate that distributed entanglement with adaptive shielding significantly improves fidelity and key generation rates under realistic noise models. This study contributes to the ongoing effort to establish a practical, trust-free quantum internet, providing a pathway toward global-scale secure communication infrastructures. Furthermore, a formal security proof is provided to demonstrate that the authentication-free protocol remains secure against general quantum attacks without relying on trusted nodes.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Barnett effect-induced nonreciprocal entanglement and Gaussian interferometric power in magnomechanics with optical parametric amplifier","authors":"Noura Chabar,&nbsp;M’bark Amghar,&nbsp;Shakir Ullah,&nbsp;Mohamed Amazioug,&nbsp;Kottakkaran Sooppy Nisar,&nbsp;Mohammed Zakarya,&nbsp;Gamal M. Ismail,&nbsp;Abdel-Haleem Abdel-Aty","doi":"10.1007/s11128-026-05252-8","DOIUrl":"10.1007/s11128-026-05252-8","url":null,"abstract":"<div><p>Nonreciprocity is a powerful tool in quantum technologies. It allows signals to be sent in one direction but not the other. In this article, we propose a method for achieving nonreciprocal entanglement and Gaussian interferometric power (GIP) via the Barnett effect. The yttrium iron garnet (YIG) is coupled to a microwave cavity that interacts with an optical parametric amplifier (OPA). Due to the Barnett effect, nonreciprocal entanglement can emerge. By fine-tuning the cavity detuning, the GIP can exhibit nonreciprocal behavior. The nonreciprocal entanglement can reach its ideal values within accessible parameter regimes by tuning the photon frequency detuning, selecting the cavity–magnon coupling regime, adjusting the nonlinear gain, and setting the phase shift of the OPA. Notably, both the degree of entanglement nonreciprocity and its robustness against thermal noise are significantly enhanced by increasing the OPA gain. This nonreciprocity can be significantly enhanced even at relatively high temperatures. Our work paves the way for developing nonreciprocal single-phonon devices, which could play a significant role in advancing quantum information processing and quantum communication technologies. This proposed scheme could pave the way for the development of novel nonreciprocal devices that remain robust under thermal fluctuations.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deterministic symmetric bidirectional cyclic controlled quantum state transmission scheme in four noisy environments","authors":"Yi-Ru Sun,&nbsp;Haibo Hong,&nbsp;Yi-Xian Yang","doi":"10.1007/s11128-026-05233-x","DOIUrl":"10.1007/s11128-026-05233-x","url":null,"abstract":"<div><p>The emergence of bidirectional cyclic quantum state transmission schemes represents a pivotal advancement in quantum communication, as it resolves critical limitations and resource redundancy problems associated with traditional unidirectional transmission strategies while substantially boosting communication efficiency and resource utilization ratios. Despite this progress, unresequolved challenges remain in practical deployments, particularly the frequent requirement for auxiliary resources and the implementation of measurement operations that are either overly sophisticated or computationally intensive. To tackle these issues, this study presents a deterministic symmetric bidirectional cyclic controlled quantum state transmission scheme, which is capable of realizing bidirectional remote preparation of six two-qubit states in a fully closed transmission loop. The design of the proposed scheme is optimized through four key aspects. First, the controller employs Hadamard (H) and controlled-NOT (CNOT) operations to generate a 25-qubit entangled state, which is utilized as the quantum channel. This design allows all participants to complete subsequent transmission tasks without resorting to any auxiliary particles or additional operations. Second, the measurement is engineered for simplicity and practicality, involving merely six two-qubit measurements and one single-qubit measurement. Leveraging the measurement results shared via classical channels, the receiver can achieve deterministic recovery of the preprepared target state. Third, the robustness of the scheme against noise is evaluated in four representative noise environments. Fidelity analysis reveals that both the noise factor and the coefficients of the quantum state play a decisive role in determining the fidelity of the output state. Finally, a multi-dimensional comparative study with existing relevant schemes verifies that the proposed protocol demonstrates superior performance in terms of the count of transmitted quantum state particles, classical communication cost, and communication efficiency, highlighting its potential for practical quantum communication applications.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantifying multi-qubit coherence","authors":"Shivang Pandey,&nbsp;Debabrata Goswami","doi":"10.1007/s11128-026-05218-w","DOIUrl":"10.1007/s11128-026-05218-w","url":null,"abstract":"<div><p>Coherence is essential for scaling quantum computers, yet its precise quantification remains challenging. In this work, we define the coherence content of a given quantum state and quantify the “quantum character'' of qubits by tracking the temporal evolution of their coherence through the diagonal elements of the density matrix - <i>C</i>_<i>PDD</i>. Unlike the widely used <span>(l_{1})</span>-norm, which lacks direct physical interpretation in observable population dynamics,<i> C</i>_<i>PDD</i> provides a self-normalized and linearly sensitive quantifier near maximally coherent states. Our analysis spans systems from two qubits to three qubits and beyond, using simulations to examine coherence in light–matter interactions and assess the effects of inter-qubit coupling, detuning, and interaction strength. These results provide a framework for identifying optimal conditions to maintain coherence, thereby enhancing the performance and scalability of future quantum algorithms.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective qubit entanglement via projective (Omega )-product: algebraic framework and interactive visualization","authors":"Volkan Duran,&nbsp;Ferhat Taş","doi":"10.1007/s11128-026-05264-4","DOIUrl":"10.1007/s11128-026-05264-4","url":null,"abstract":"<div><p>We introduce the projective <span>(Omega )</span>-product, a novel algebraic framework for analyzing and engineering projection-induced, basis-restricted entangled quantum states. Unlike conventional entanglement methods that rely on complex quantum gate sequences, our approach uses an idempotent projection operator </p><div><div><span>$$ P:= |00rangle langle 00| + |11rangle langle 11| $$</span></div></div><p>and defines the <span>(Omega )</span>-product as the normalized, post-selected map </p><div><div><span>$$ Omega ({|{varphi }rangle },{|{psi }rangle }):= frac{P({|{varphi }rangle }otimes {|{psi }rangle })}{left| P({|{varphi }rangle }otimes {|{psi }rangle })right| }, $$</span></div></div><p>to produce Bell-type entangled states from input qubit pairs conditional on successful projection. We show that <i>P</i> is an idempotent, non-unitary operator that preserves entanglement patterns defined over computational basis subspaces. Through a combination of analytical tools (Schmidt decomposition, entropy metrics) and interactive simulations via the Dolana simulator (Three.js Bloch sphere visualizer), we evaluate the fidelity, entropy, and robustness of <span>(Omega )</span>-generated states. Performance benchmarks indicate hardware efficiency advantages over CNOT-based methods, including one algebraic (heralded) projection step with expected time overhead scaling as <span>(1/p_{textrm{succ}})</span>, and a clear separation between the ancilla-free algebraic formalism and ancilla-assisted hardware realizations. We discuss implementation pathways on superconducting and trapped-ion platforms and provide a generalization to qudits and multipartite states. This work offers a mathematically consistent, physically viable, and computationally efficient approach to selective entanglement generation, with applications in quantum communication and fault-tolerant protocols.</p></div>","PeriodicalId":746,"journal":{"name":"Quantum Information Processing","volume":"25 8","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}