Abstract: Decoding low-density parity-check codes is critical in many current technologies, such as fifth-generation (5G) wireless networks and satellite communications. The belief propagation algorithm allows for fast decoding due to the low density of these codes. However, there is scope for improvement to this algorithm both in terms of its computational cost when decoding large […]
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 […]
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 […]
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 […]
Abstract: Topological quantum codes are promising candidates for realizing fault-tolerant quantum computing. In this context, belief propagation (BP) decoding is an efficient method for topological codes, offering high error-correction performance with low complexity. However, BP decoding suffers significant performance degradation due to quantum trapping sets (QTSs). Although various decoding schemes have been proposed to mitigate […]
Abstract: Quantum Key Distribution (QKD) enables information-theoretic secure key establishment and provides a promising mechanism for strengthening satellite communication (SATCOM) systems against quantum-capable adversaries. This paper presents a unified engineering-oriented framework for evaluating satellite-based QKD in dual-use SATCOM environments. Rather than introducing a new QKD protocol or propagation model, the contribution lies in integrating established […]
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: […]
Abstract: The quantum approximate optimization algorithm (QAOA) is designed to determine optimum and near optimum solutions of quadratic (and higher order) unconstrained binary optimization (QUBO or HUBO) problems, which in turn accurately model unconstrained combinatorial optimization problems. While the solution space of an unconstrained combinatorial optimization problem consists of all possible combinations of the objective […]
Abstract: Quantum game theory is an extension of classical game theory that uses quantum principles in game theory. The Eisert-Wilkens-Lewenstein (EWL) quantum game is an early example of the twoplayer classical Prisoner’s Dilemma transformed into a quantum Prisoner’s Dilemma. In the EWL game, the players choose pure quantum strategies represented by unitary matrices. This extension […]
Abstract: Commercial quantum key distribution (QKD) systems are currently very expensive and usually come as large server rack components. Thus, their application is still very limited and adoption in practical implementations has not happened yet. One reason for the high price and large size is the use of high-end and custom-built hardware. We present for […]