Stability analysis Archives - IEEE Transactions on Quantum Engineering

Parameter Analysis and Optimization of Layer Fidelity for Quantum Processor Benchmarking at Scale

February 26, 2026Maria Jose Lozano Palacio, Hasan Nayfeh, Matthew Ware, David C. McKayQuantum ComputingBenchmark testing, Cost function, Crosstalk, Logic gates, Monitoring, Object recognition, Performance evaluation, Protocols, Qubit, Stability analysis

Abstract: With the continued scaling of quantum processors, holistic benchmarks are essential for extensively evaluating device performance. Layer fidelity is a benchmark well-suited to assessing processor performance at scale. Key advantages of this benchmark include its natural alignment with randomized benchmarking (RB) procedures, crosstalk awareness, fast measurements over large numbers of qubits, high signal-to-noise ratio, […]

On Quantum Natural Policy Gradients

June 24, 2024André Sequeira, Luis Paulo Santos, Luis Soares BarbosaQuantum ComputingComplexity theory, Gradient methods, Optimization, Reinforcement learning, Stability analysis, Standards, Task analysis

This article delves into the role of the quantum Fisher information matrix (FIM) in enhancing the performance of parameterized quantum circuit (PQC)-based reinforcement learning agents. While previous studies have highlighted the effectiveness of PQC-based policies preconditioned with the quantum FIM in contextual bandits, its impact in broader reinforcement learning contexts, such as Markov decision processes, […]

A Stable Hash Function Based on Parity-Dependent Quantum Walks With Memory (August 2023)

February 21, 2024Qing Zhou, Xueming Tang, Songfeng Lu, Hao YangQuantum ComputingHash functions, Numerical stability, Qubit, Resistance, Security, Stability analysis, Transforms

In this article, we develop a generic controlled alternate quantum walk model by combining parity-dependent quantum walks with distinct arbitrary memory lengths and propose a hash function (called QHFM-P) based on this model. The statistical properties of the proposed scheme are stable with respect to the coin parameters of the underlying controlled quantum walks, and […]

A Stable Hash Function Based on Parity-dependent Quantum Walks with Memory (August 2023)

August 22, 2023Qingfeng ZhouQuantum EngineeringHash functions, Numerical stability, Qubit, Resistance, Security, Stability analysis, Transforms

In this paper, we develop a generic controlled alternate quantum-walk model (called CQWMP) by combining parity-dependent quantum walks with distinct arbitrary memory lengths and propose a hash function (called QHFM-P) based on this model. The statistical properties of the proposed scheme are stable with respect to the coin parameters of the underlying controlled quantum walks; […]