Qubit Archives - IEEE Transactions on Quantum Engineering

Real Variance-Based Variational Quantum Eigensolver for Non-Hermitian Matrices

October 9, 2026Durgesh Pandey, Ankit Kumar Das, P. ArumugamEarly Access, Open AccessAlgorithms, Cost function, Costing, Costs, Eigenvalues and eigenfunctions, Hardware, Matrices, Minimization, Optimization, Qubit

Abstract: Non-Hermitian operators naturally arise in the description of open quantum systems, which exhibit features such as resonances and decay processes, where the associated eigenvalues are complex. Standard quantum algorithms, including the Variational Quantum Eigensolver (VQE), are designed for Hermitian operators and are ineffective in recovering correct eigenvalues for non-Hermitian matrices. We present a systematic […]

Recursive Alternating Amplitude Embedding: A Hybrid Quantum Circuit Architecture for Balanced Depth and Width

October 6, 2026Agi Prasetiadi, Masahiro MamboEarly Access, Open AccessArchitecture, Circuits, Complexity theory, Computer architecture, Construction, Merging, Quantum state, Qubit, Trees (botanical), Vegetation

Abstract: Transforming classical data into quantum states is an important step in quantum information processing and quantum machine learning. Among various encoding methods, Amplitude Embedding is particularly attractive due to its exponential compression capability, allowing exponentially many classical values to be encoded using only a linear number of qubits. However, existing state preparation methods exhibit […]

Physics-Informed Weighted Conjugate Light Field Processing and Quantum Neural Networks for Turbulence-Distorted OAM Beam Detection

October 6, 2026Gokul Manavalan, Shlomi ArnonEarly Access, Open AccessBeams, Bit error rate, Convolutional neural networks, Decoding, Lighting, Modeling, Physics, Propagation, Qubit, Training

Abstract: Optical wireless communication (OWC) using orbital angular momentum (OAM)-encoded structured light enables high-dimensional multiplexing for next generation free-space links. However, atmospheric turbulence introduces phase distortions, modal coupling, and intensity fluctuations that significantly degrade detection performance and increase bit-error rate (BER). In this work, we propose a physics-informed hybrid quantum–classical framework based on a weighted […]

Qubit-Efficient Quantum Circuit for the Minimum Vertex Cover Problem Using Grover’s Algorithm

September 29, 2026Krissada Sarawit, Kamonluk SuksenEarly Access, Open AccessAlgorithms, Architecture, Arithmetic, Circuits, Computer architecture, Costing, Optimization, Qubit, Radiation detectors, Registers

Abstract: The Minimum Vertex Cover (MVC) problem is a fundamental NP-hard combinatorial optimization problem with applications in network security, resource allocation, and scheduling. As quantum computing moves toward fault-tolerant operation, developing qubit-efficient algorithms remains a critical challenge. This paper presents three quantum circuit architectures for solving MVC and its weighted variant using Grover’s search algorithm: […]

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 […]

Efficiently Architecting VQAs: Expressibility–Trainability–Resources Pareto-Optimality

August 24, 2026Rodrigo M. Sanz, Andreu Anglés-Castillo, Eduard Alarcón, Carmen G. AlmudéverEarly Access, Open AccessAlgorithms, Circuits, Cost function, Costing, Costs, Design methodology, Measurement, Modeling, Optimization, Qubit

Abstract: Ansatz selection is a key factor in the performance of variational quantum algorithms (VQAs). While much of the state-of-the-art still relies on heuristic choices, an inadequate circuit structure can compromise both the expressive power and the trainability of the resulting model. Recent results have also established theoretical connections between expressibility and the onset of […]

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 […]

Clifford Manipulations of Stabilizer States – Application to Linear Optical Qubits

August 6, 2026Ashlesha Patil, Saikat GuhaEarly Access, Open AccessCircuits, Detectors, Encoding, Hilbert space, Measurement, Polarization, Probability, Quantum circuit, Qubit, Rails

Abstract: The single-photon dual-rail qubit is popular for photonic quantum computing and communications, both due to gates being realizable with linear optics (LO) and photon detection, as well as easy interfaces with matter quantum memories. Two-qubit operations, i.e., two-qubit gates followed by the measurement of one (Type-I fusion) or both (Type-II fusion) qubits, are, however, […]

Matrix Low-dimensional Qubit Casting Based Quantum Electromagnetic Transient Network Simulation Program

July 13, 2026Qi Lou, Yijun Xu, Wei GuEarly Access, Open AccessAdmittance, Circuits, Costing, Matrices, Modeling, Quantum circuit, Qubit, Simulation, Switches, Timing

Abstract: In modern power systems, the integration of converter-interfaced generations requires the development of electromagnetic transient network simulation programs (EMTP) that can capture rapid fluctuations. However, as the power system scales, the EMTP’s computing complexity increases exponentially, leading to a curse of dimensionality that hinders its practical application. Facing this challenge, quantum computing offers a […]