Joining processes Archives - IEEE Transactions on Quantum Engineering

Satellite-Based Quantum Key Distribution for Quantum-Secure Dual-Use SATCOM: Architecture, Trust Models, and Orbit-Dependent Performance Analysis

October 1, 2026Joan Bas, Albert Compte, Joanna Sliwa, Konrad WronaEarly Access, Open AccessArchitecture, Computer architecture, Distance measurement, Grounding, Joining processes, Low earth orbit satellites, Modeling, Orbits, Satellites, Security

Abstract: Quantum Key Distribution (QKD) enables information-theoretic secure key establishment and provides a promising mechanism for strengthening satellite communication (SATCOM) systems against quantum-capable adversaries. This paper presents a unified engineering-oriented framework for evaluating satellite-based QKD in dual-use SATCOM environments. Rather than introducing a new QKD protocol or propagation model, the contribution lies in integrating established […]

A Low-Cost, Off-The-Shelf Quantum Key Distribution System with kbit/s Key Generation Rates

September 14, 2026Fabian Klingmann, Kriti Dutta, Mira R. D. Stephan, Max Haymann-Pohl, Lorenz Reuschel, Alexander Noack, René Kirrbach, Jingzhong Yang, Dr. Fei DingEarly Access, Open AccessCosting, Costs, Joining processes, Microcontrollers, Polarization, Quantum key distribution, Synchronization, Textile fibers, Timing, Transmitters

Abstract: Commercial quantum key distribution (QKD) systems are currently very expensive and usually come as large server rack components. Thus, their application is still very limited and adoption in practical implementations has not happened yet. One reason for the high price and large size is the use of high-end and custom-built hardware. We present for […]

Integrated Superconducting High-Q Seamless Cavity for Quantum Memory and Qubit Readout Applications

August 31, 2026Mohamed F. Hagag, Kareem H. El-Gendy, Bashar Zyoud, Thomas R. Jones, Karim Seddik, Dimitrios PeroulisEarly Access, Open AccessArchitecture, Couplings, Dielectrics, Filtering, Frequency, Joining processes, Memory, Qubit, Resonators, Surfaces

Abstract: This work presents a novel micromachined, seamless sapphire–silicon hybrid evanescent-mode cavity architecture incorporating selectively engineered coupling channels and flux-tunable external coupling via a SQUID. The proposed design enables two simulated operating states within a single device: an ultra–high Q memory configuration and a high-speed readout configuration with intrinsic Purcell filtering, which is expected to […]

Interconnecting Regional QKD Networks: Hybrid Key Delivery Across Quantum Domains

August 31, 2026David Barral, Aitor Brazaola-Vicario, Diego Cifrián, Natalia Costas, Gonzalo Blázquez, Ana Fernández-Vilas, Iago Fernández Llovo, Pedro Otero, Pablo Pío Rejo, Alejandra Ruiz, Juan Villasuso, Manuel Fernández-VeigaEarly Access, Open AccessArchitecture, Computer architecture, Databases, ETSI, Joining processes, Management, Quantum key distribution, Relays, Security, Timing

Abstract: QKD technology is being increasingly adopted inside the network core for protecting information transport against any form of computational attacks. However, the use of QKD for wide-area internetworking is still challenging and costly, due to its strong trust assumptions and the low achievable key rates in long QKD links. This paper presents a standards-driven […]

Field Demonstration of a Passive Phase and Polarization Stabilization Architecture for Sagnac Twin-Field QKD

August 28, 2026Martin Clason, Christiano M. S. do Nascimento, Felipe Calliari, Joakim Argillander, Guilherme B. Xavier, Guilherme P. TemporãoEarly Access, Open AccessFrequency modulation, Generators, Interference, Joining processes, Optical fibers, Polarization, Quantum communication, Quantum key distribution, Textile fibers, Timing

Abstract: Twin-field quantum key distribution (TF-QKD) relies on first-order interference between coherent optical fields combined at an intermediate station, which requires simultaneous phase and polarization stabilization. We present a Sagnac-like interferometric architecture arranged in a hybrid star–bus network topology that enables any-to-any connectivity while providing passive stabilization of phase and polarization fluctuations for multiple wavelengths. […]

Entanglement Distribution and Teleportation in Assisted and Scalable Quantum Access Networks

August 11, 2026Amir Mohammad Yaghoobianzadeh, Jawad A. SalehiEarly Access, Open AccessDetectors, Joining processes, Matrices, Modeling, Passive optical networks, Probability, Protocols, Reviews, Teleportation, Textile fibers

Abstract: We have investigated the entanglement distribution and quantum teleportation in quantum passive optical networks (QPONs), where an entangled state is distributed between the central node and multiple end users through lossy fibers and passive optical splitter/combiner. The entanglement degradation is quantified using logarithmic negativity, and teleportation fidelity both in non-assisted and assisted strategies. We […]

Network-Based Quantum Computing: an Efficient Design Framework for Many-small-node Distributed Fault-Tolerant Quantum Computing

August 10, 2026Soshun Naito, Yasunari Suzuki, Yuuki TokunagaEarly Access, Open AccessAlgorithms, Circuits, Design methodology, Joining processes, Optimization, Ports (computers), Quantum computing, Qubit, Switches, Timing

Abstract: In fault-tolerant quantum computing, a large number of physical qubits are required to construct a single logical qubit, and a single quantum node may be able to hold only a small number of logical qubits. In such a case, the idea of distributed fault-tolerant quantum computing (DFTQC) is important to demonstrate large-scale quantum computation […]

Boosting Information Reconciliation for Decoy-State Quantum Key Distribution Over a Satellite Downlink Channel

July 22, 2026T. Scarinzi, D. Orsucci, M. Ferrari, L. BarlettaEarly Access, Open AccessArrays, Codes, Distance measurement, Joining processes, Modeling, Quantum key distribution, Receivers, Satellites, Simulation, Timing

Abstract: Quantum Key Distribution (QKD) is a cryptographic solution that leverages the properties of quantum mechanics to be resistant and secure even against an attacker with unlimited computational power. Satellite-based links are important in QKD because they can reach distances that the best fiber systems cannot. However, links between satellites in Low Earth Orbit (LEO) […]

Quantum Communication Infrastructure Cost Optimization Using a Genetic Algorithm

July 15, 2026Ange Joel Nounga Njanda, Edmar Egidio Souza, Raul C. Almeida, Anderson A. Tomkelski, Karcius D. R. AssisEarly Access, Open AccessAlgorithms, Costing, Costs, Joining processes, Modeling, Optimization, Planning, Radio access networks, Regional area networks, Topology

Abstract: This paper proposes an optimization model for the design of quantum communication infrastructures (QCI) with the aim of minimizing capital expenditure (CAPEX), focusing on the costs associated with the deployment of quantum links and trusted repeater nodes (TRNs). The model is formulated using an integer linear programming (ILP) program that incorporates physical and operational […]

Hybrid Quantum Capsule Network: Quantum Transformation Circuit as Vote Transformation in Image Classification

July 2, 2026Ridho Nur Rohman Wijaya, Budi Setiyono, Dwi Ratna SulistyaningrumEarly Access, Open AccessAccuracy, Joining processes, Measurement, Modeling, Qubit, Routing, Testing, Training, Vectors, Voting

Abstract: Capsule Network (CapsNet) provides a richer hierarchical representation than conventional neural networks through vector-shaped capsules and inter-capsule routing. However, most CapsNet designs still rely on classic matrix-multiplication-based vote transformations, which limit the formation of the prediction vector to linear mappings in Euclidean space. In this paper, we propose the Hybrid Quantum Capsule Network (HQCapsNet), […]