Topology Archives - IEEE Transactions on Quantum Engineering

Analysis of Parameterized Quantum Circuits: On the Connection Between Expressibility and Types of Quantum Gates

May 19, 2025Yu Liu; Kazuya Kaneko; Kentaro Baba; Jumpei Koyama; Koichi Kimura; Naoyuki TakedaQuantum Computing, UncategorizedAccuracy, Additives, Computational modeling, Integrated circuit modeling, Kernel, Logic gates, Predictive models, Quantum circuit, Qubit, Topology

Abstract: Expressibility is a crucial factor of a parameterized quantum circuit (PQC). In the context of variational-quantum-algorithm-based quantum machine learning (QML), a QML model composed of a highly expressible PQC and a sufficient number of qubits is theoretically capable of approximating any arbitrary continuous function. While much research has explored the relationship between expressibility and […]

Quantum Wavelength-Division Multiplexing and Multiple-Access Communication Systems and Networks: Advanced Applications

May 12, 2025Marzieh Bathaee; Mohammad Rezai; Jawad A. SalehiQuantum Networking & Communications, UncategorizedCommunication systems, Mathematical models, Network topology, Optical fiber amplifiers, Optical fiber networks, Quantum networks, Receivers, Stars, Topology, WDM networks

Abstract: A cost-effective global quantum Internet may be developed using the existing communication infrastructure. This article examines the quantum version of three conventional wavelength-division-multiplexing and multiple-access (WDM) communication systems and networks. They are Lambdanet-based broadcast WDM networks, quantum routers based on a waveguide grating router, and fiber-to-the-quantum nodes that are fed by two opposing and […]

Entanglement Routing in Quantum Networks: A Comprehensive Survey

February 11, 2025Amar Abane, Michael Cubeddu, Van Sy Mai, Abdella BattouQuantum InternetComputer architecture, Quantum channels, Quantum entanglement, Quantum repeaters, Repeaters, Reviews, Routing, Routing protocols, Surveys, Topology

Entanglement routing in near-term quantum networks consists of choosing the optimal sequence of short-range entanglements to combine through swapping operations to establish end-to-end entanglement between two distant nodes. Similar to traditional routing technologies, a quantum routing protocol uses network information to choose the best paths to satisfy a set of end-to-end entanglement requests. However, in […]

Security and Fairness in Multiparty Quantum Secret Sharing Protocol

January 29, 2025Alessio Di Santo, Walter Tiberti, Dajana CassioliQuantum InternetAuthentication, Cryptography, Fault tolerance, Fault tolerant systems, Network topology, Protocols, Quantum networks, Routing, Scalability, Topology

Quantum secret sharing (QSS) is a cryptographic protocol that leverages quantum mechanics to distribute a secret among multiple parties. With respect to the classical counterpart, in QSS, the secret is encoded into quantum states and shared by a dealer such that only an authorized subsets of participants, i.e., the players, can reconstruct it. Several state-of-the-art […]

Convexification of the Quantum Network Utility Maximization Problem

December 30, 2024Sounak Kar, Stephanie WehnerQuantum InternetMeasurement, Optimization, Quality of service, Quantum networks, Repeaters, Resource management, Routing protocols, Sufficient conditions, Topology, Vectors

Network utility maximization (NUM) addresses the problem of allocating resources fairly within a network and explores the ways to achieve optimal allocation in real-world networks. Although extensively studied in classical networks, NUM is an emerging area of research in the context of quantum networks. In this work, we consider the quantum network utility maximization (QNUM) […]

BeSnake: A Routing Algorithm for Scalable Spin-Qubit Architectures

July 17, 2024Nikiforos Paraskevopoulos, Carmen G. Almudever, Sebastian FeldQuantum ComputingComputer architecture, Logic gates, Quantum circuit, Qubit, Routing, Task analysis, Topology

As quantum computing devices increase in size with respect to the number of qubits, two-qubit interactions become more challenging, necessitating innovative and scalable qubit routing solutions. In this work, we introduce beSnake, a novel algorithm specifically designed to address the intricate qubit routing challenges in scalable spin-qubit architectures. Unlike traditional methods in superconducting architectures that […]

Advanced Shuttle Strategies for Parallel QCCD Architectures

June 3, 2024Weining Dai, Kevin A. Brown, Thomas G. RobertazziQuantum ComputingComputer architecture, Ions, Junctions, Logic gates, Quantum computing, Qubit, Topology

Trapped ions (TIs) are at the forefront of quantum computing implementation, offering unparalleled coherence, fidelity, and connectivity. However, the scalability of TI systems is hampered by the limited capacity of individual ion traps, necessitating intricate ion shuttling for advanced computational tasks. The quantum charge-coupled device (QCCD) framework has emerged as a promising solution, facilitating ion […]

On the Bipartite Entanglement Capacity of Quantum Networks

February 16, 2024Gayane Vardoyan, Emily van Milligen, Saikat Guha, Stephanie Wehner, Don TowsleyQuantum InternetCapacity planning, Multiplexing, Probabilistic logic, Quantum entanglement, Quantum networks, Routing, Topology

We consider the problem of multipath entanglement distribution to a pair of nodes in a quantum network consisting of devices with nondeterministic entanglement swapping capabilities. Multipath entanglement distribution enables a network to establish end-to-end entangled links across any number of available paths with preestablished link-level entanglement. Probabilistic entanglement swapping, on the other hand, limits the […]

Multiuser Entanglement Distribution in Quantum Networks Using Multipath Routing

November 2, 2023Evan SutcliffeRegularPerformance evaluation, Protocols, Quantum entanglement, Quantum networks, Qubit, Routing, Topology

Quantum networks facilitate numerous applications including secure communication and distributed quantum computation by performing entanglement distribution. For some multiuser quantum applications, access to a shared multipartite state is required. We consider the problem of designing protocols for distributing such states, at an increased rate. For this, we propose three protocols that leverage multipath routing to […]

A Hardware-Aware Heuristic for the Qubit Mapping Problem in the NISQ Era

September 24, 2020Siyuan Niu; Adrien Suau; Gabriel Staffelbach; Aida Todri-SanialOpen Access, Quantum InformationCalibration, Error analysis, Hardware, Logic gates, Noise measurement, Quantum computing, Topology

Due to several physical limitations in the realization of quantum hardware, today’s quantum computers are qualified as noisy intermediate-scale quantum (NISQ) hardware. NISQ hardware is characterized by a small number of qubits (50 to a few hundred) and noisy operations. Moreover, current realizations of superconducting quantum chips do not have the ideal all-to-all connectivity between […]