Mohamed F. Hagag, Kareem H. El-Gendy, Bashar Zyoud, Thomas R. Jones, Karim Seddik, Dimitrios Peroulis, Author at IEEE Transactions on Quantum Engineering

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 […]

RuleSet Generation Framework for Application Layer Integration in Quantum Internet

August 31, 2026Rei Kawano, Shin Nishio, Hideaki Kawaguchi, Shota Nagayama, Takahiko SatohEarly Access, Open AccessInternet, Memory, Modeling, Protocols, Qubit, Repeaters, Schedules, Scheduling, Servers, Timing

Abstract: Layered architectures for the Quantum Internet have been proposed, inspired by that of the classical Internet, which has demonstrated high maintainability even in large-scale systems. While lower layers in the Quantum Internet, such as entanglement generation and distribution, have been extensively studied, the application layer — responsible for translating user requests into executable quantum-network […]

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. […]