Qubit Archives - Page 2 of 20 - IEEE Transactions on Quantum Engineering

A Graphical Rule Book for Clifford Manipulations of Stabilizer States

January 12, 2026Ashlesha Patil, Saikat GuhaQuantum ComputingCogeneration, Eigenvalues and eigenfunctions, Generators, Logic gates, Quantum entanglement, Quantum networks, Quantum state, Qubit, Reviews, Rotation measurement

Abstract: Stabilizer states, along with Clifford manipulations (unitary transformations and measurements) thereof—despite being efficiently simulable on a classical computer—are an important tool in quantum information processing, with applications to quantum computing, error correction, and networking. Graph states, defined on a graph, are a special class of stabilizer states that are central to measurement-based quantum computing, […]

Quantum Error Correction for Second-Generation Quantum Repeaters

December 31, 2025Dawei Jiao, Mahdi Bayanifar, Alexei Ashikhmin, Olav TirkkonenQuantum InternetCodes, Error correction codes, Generators, Logic gates, Purification, Quantum entanglement, Quantum repeaters, Qubit, Repeaters, Vectors

Abstract: In this article, we consider second-generation (2G) quantum repeaters (QRs) for creating long-distance entanglement in quantum networks. Combining a distance-dependent depolarizing error model with the nonlocal Bell state purification procedure required by 2G QRs leads to an error model consisting of correlated and biased errors. To correct correlated errors, nonsymmetric Calderbank–Steane–Shor (CSS) codes with […]

Integrated Encoding and Quantization to Enhance Quanvolutional Neural Networks

December 18, 2025Daniele Lizzio Bosco, Beatrice Portelli, Giuseppe SerraQuantum ComputingConvolutional neural networks, Encoding, Image coding, Integrated circuit modeling, Logic gates, Neural networks, Quantization (signal), Quantum circuit, Quantum state, Qubit

Abstract: Image processing is one of the most promising applications for quantum machine learning. Quanvolutional neural networks with nontrainable parameters are the preferred solution to run on current and near future quantum devices. The typical input preprocessing pipeline for quanvolutional layers comprises of four steps: optional input binary quantization, encoding classical data into quantum states, […]

On-Demand Resource Allocation for a Quantum Network Hub

December 9, 2025Scarlett Gauthier, Thirupathaiah Vasantam, Gayane VardoyanQuantum InternetCalibration, Hardware, Numerical models, Optical switches, Photonics, Quantum entanglement, Quantum networks, Qubit, Resource management, Telephone sets

Abstract: To effectively support the execution of quantum network applications for multiple sets of user-controlled quantum nodes, a quantum network must efficiently allocate shared resources. We study traffic models for a type of quantum network hub called an entanglement generation switch (EGS), a device that allocates resources to enable entanglement generation between nodes in response […]

Optimal Control-Assisted Rapid Quantum State Transfer on 1-D Spin Chain

December 8, 2025Kai Zhang, Sen KuangQuantum InternetCouplings, Impurities, Protocols, Quantum entanglement, Quantum state, Qubit, Receivers, Semiconductor device measurement, Teleportation, Temperature measurement

Abstract: Traditional many-body teleportation relies on the strong interaction property of a quantum many-body system, which usually requires numerous qubits and entanglement resources, making it difficult to realize experimentally. A natural scheme is to use a 1-D spin chain with simple structure to realize many-body teleportation. In this article, we analyze the conditions for general […]

Low-Complexity Syndrome-Based Linear Programming Decoding of Quantum LDPC Codes

December 4, 2025Sana Javed, Sergio Colet, Francisco Garcia-Herrero, Óscar Ruano, Juan Antonio Maestro, Bane Vasić, Mark F. FlanaganQuantum InformationBenchmark testing, Codes, Decoding, Error analysis, Error correction codes, Floors, Iterative decoding, Linear programming, Noise, Qubit

Abstract: This article proposes a novel low-complexity syndrome-based linear programming (SB-LP) decoding algorithm for decoding quantum low-density parity-check codes. Under the code-capacity model, the SB-LP decoder can be used as a standalone decoder; however, it is particularly powerful when used as a postprocessing step following SB min-sum (SB-MS) decoding. In the latter case, the proposed […]

Relative Entropy-Based Training of Quantum Neural Networks

December 1, 2025Subhadeep Mondal, Amit Kumar DuttaQuantum ComputingCost function, Entropy, Indexes, Machine learning, Neural networks, Noise, Quantum channels, Quantum computing, Qubit, Training

Abstract: Quantum neural networks (QNNs) are gaining attention as versatile models for quantum machine learning, but training them effectively remains a challenge. Most existing approaches, such as quantum multilayer perceptrons, use fidelity-based cost functions. While well-suited for pure states, these measures are less reliable when inputs and outputs are mixed states—a situation common in learning […]

Transmon Qubit Modeling and Characterization for Dark Matter Search

November 14, 2025Roberto Moretti, Danilo Labranca, Pietro Campana, Rodolfo Carobene, Marco Gobbo, Manuel A. Castellanos-Beltran, David Olaya, Peter F. Hopkins, Leonardo Banchi, Matteo Borghesi, Alessandro Candido, Stefano Carrazza, Hervè Atsè Corti, Alessandro D Elia, Marco Faverzani, Elena Ferri, Angelo Nucciotti, Luca Origo, Andrea Pasquale, Alex Stephane Piedjou Komnang, Alessio Rettaroli, Simone Tocci, Claudio Gatti, Andrea GiacheroQuantum Sensing & MetrologyCapacitance, Coherence time, Couplings, Dark matter, Magnetic fields, Photonics, Physics, Qubit, Resonant frequency, Transmission line measurements

Abstract: This study presents the design, simulation, and experimental characterization of a superconducting transmon qubit circuit prototype for potential applications in dark matter detection experiments. We describe a planar circuit design featuring two noninteracting transmon qubits, one with fixed frequency and the other flux tunable. Finite-element simulations were employed to extract key Hamiltonian parameters and […]

Hardware-Aware and Resource-Efficient Circuit Packing and Scheduling on Trapped-Ion Quantum Computers

November 14, 2025Miguel Palma, Shuwen Kan, Wenqi Wei, Juntao Chen, Kaixun Hua, Sara Mouradian, Ying MaoQuantum SoftwareCloud computing, Computer architecture, Computers, Hardware, Logic gates, Processor scheduling, Quantum circuit, Qubit, Resource management, Throughput

Abstract: The rapid expansion of quantum cloud services has led to long job queues due to single-tenant execution models that underutilize hardware resources. Quantum multiprogramming (QMP) mitigates this by executing multiple circuits in parallel on a single device, but existing methods target superconducting systems with limited connectivity, high crosstalk, and lower gate fidelity. Trapped-ion architecture, […]

Combined Physical- and Link-Layer Protocols for Quantum Networks

November 7, 2025Benedikt Baier, Ria Rosenauer, Vili Li, Christian Deppe, Wolfgang KellererQuantum InternetAccuracy, Atomic measurements, Biological system modeling, Delays, Photon detectors, Protocols, Quantum entanglement, Quantum networks, Qubit, Runtime

Abstract: Future communication systems are expected to integrate quantum networks to enable highly secure communication and enhance computational capabilities. In quantum networks, communication is accomplished by sharing entanglement between remote locations, which is the basis for most known quantum protocols. Entanglement is a correlation between qubits that is not reproducible with classical means. However, as […]