This article explores the use of QUBO as a practical and educational framework for solving complex optimization problems. QUBO models are widely applicable across fields such as scheduling, routing, and resource allocation, and are compatible with classical, hybrid, and quantum solvers. We discuss the core principles behind QUBO, its connection to physical systems like the Ising model, and its growing relevance in research and education. To demonstrate the practical side, we apply QUBO to a real-world-inspired Multi-agent Route Planning problem, where the goal is to maximize the network coverage while minimizing the total overlap of vehicle-routes. This use-case helps illustrate how QUBO formulations can model trade-offs, encode constraints, and scale to larger problem sizes. In addition, we evaluate midsized instances of the problem on D-Wave Systems’ Advantage2 quantum annealer. The study aims to bridge theoretical optimization with hands-on experimentation, making it suitable for both teaching and applied research.
This article explores the use of QUBO as a practical and educational framework for solving complex optimization problems. QUBO models are widely applicable across fields such as scheduling, routing, and resource allocation, and are compatible with classical, hybrid, and quantum solvers. We discuss the core principles behind QUBO, its connection to physical systems like the Ising model, and its growing relevance in research and education. To demonstrate the practical side, we apply QUBO to a real-world-inspired Multi-agent Route Planning problem, where the goal is to maximize the network coverage while minimizing the total overlap of vehicle-routes. This use-case helps illustrate how QUBO formulations can model trade-offs, encode constraints, and scale to larger problem sizes. In addition, we evaluate midsized instances of the problem on D-Wave Systems’ Advantage2 quantum annealer. The study aims to bridge theoretical optimization with hands-on experimentation, making it suitable for both teaching and applied research.
Abstract Airline itinerary and scheduling represent some of the most difficult computational problems that exist in transportation. The problems require choosing the best flight routes while determining schedules and allocating resources through various constraints which include regulatory requirements and maintenance schedules and dynamic demand patterns. The solution of small and medium-scale instances has been achieved through mixed-integer programming and heuristic methods including simulated annealing and genetic algorithms and branch-and-price but these methods become impractical for larger real-world instances due to exponential scaling issues. Quantum computing has introduced fresh solutions which enable the resolution of these problems. Quantum mechanical phenomena particularly superposition and entanglement enable optimization algorithms to examine an exponentially expanded solution space simultaneously. Our research applies a basic airline scheduling problem to the Traveling Salesman Problem (TSP) before converting it into a Quadratic Unconstrained Binary Optimization (QUBO) problem. The Quantum Approximate Optimization Algorithm (QAOA) serves as a hybrid quantum-classical method to solve this formulation. The experimental evaluation of a 4-city scenario shows that quantum-based optimization generates performance levels comparable to traditional methods and indicates that improved quantum hardware development will provide computational benefits for complex airline scheduling problems. This research holds dual importance because it can minimize operational expenses and improve scheduling performance and it establishes fundamental principles for complex combinatorial problem optimization across the transportation industry. The research establishes fundamental principles for quantum-enabled applications that will revolutionize airline operations and other transportation networks by solving critical scalability and solution quality problems.
Vehicle Routing Problem is a well-known optimization issue, which has many extensions resulting from practical appliances. The problem is NP-hard, therefore it may be impossible to find an optimal solution for big instances, with traditional computation methods. Recent development of quantum technology, may be a response for this challenge, which however requires a different formulation of the model. The problem is then modeled using Quadratic Unconstrained Binary Optimization (QUBO) equations. Such model can be run using quantum annealers (QA), designed specifically for optimization purposes. This paper is a systematic survey of Vehicle Routing Problem models that are formulated using QUBO, to be solved on quantum computers. The main goal of the paper is to check research gaps in this subject, compare and explain different approaches of modeling various problem extensions with QUBO. The results obtained in reviewed papers will be presented and analyzed. Moreover, the theoretical basis for quantum computation will be presented, with focus on D-Wave company solutions.
In recent years, quantum computing has emerged as a rapidly advancing interdisciplinary field, attracting growing attention from both academia and industry owing to its fundamentally novel approach to information processing and its potential to achieve computational capabilities beyond the reach of classical systems. This paper presents a structured review of quantum computing approaches applied to scheduling problems, which are among the most challenging NP-hard optimization problems. We first introduce fundamental principles of quantum computing, including gate-based models, quantum annealing, and hybrid frameworks. We then explore how various scheduling problems such as job-shop, flow-shop, and project scheduling-are encoded into quantum models, particularly using QUBO formulations suitable for current quantum devices. Finally, we discuss key limitations such as hardware constraints and model scalability, and we identify research directions to advance quantumenhanced scheduling methods. By grounding theory in empirical case studies and highlighting near-term deployable solutions, this study bridges the gap between quantum algorithm development and practical scheduling demands, offering a roadmap for researchers and practitioners in quantum optimization.
Optimization is a crucial challenge across various domains, including finance, resource allocation, and mobility. Quantum computing has the potential to redefine the way we handle complex problems by reducing computational complexity and enhancing solution quality. Optimization, particularly of objective functions, stands to benefit significantly from quantum solvers, which leverage principles of quantum mechanics like superposition, entanglement, and tunneling. The Ising and Quadratic Unconstrained Binary Optimization (QUBO) models are the most suitable formulations for these solvers, involving binary variables and constraints treated as penalties within the overall objective function. To harness quantum approaches for optimization, two primary strategies are employed: exploiting quantum annealers—special-purpose optimization devices—and designing algorithms based on quantum circuits. This review provides a comprehensive overview of quantum optimization methods, examining their advantages, challenges, and limitations. It demonstrates their application to real-world scenarios and outlines the steps to convert generic optimization problems into quantum-compliant models. Lastly, it discusses available tools and frameworks that facilitate the exploration of quantum solutions for optimization tasks.
Quantum computing has emerged as a promising computational paradigm with the potential to solve problems that are intractable for classical computers. This paper provides an overview of the current state of quantum computing, including its historical development, hardware advancements, applications, and challenges. Special attention is given to combinatorial optimization, which is considered one of the most promising application domains. The limitations of current quantum systems and future research directions are also discussed. This paper presents a comparative study between a conventional D-Wave-based simulated annealing approach and a proposed hybrid optimization model for solving largescale combinatorial optimization problems. The study focuses on benchmark problems, including AES, TSP gr24, and a real-world load balancing problem, all formulated as QUBO models. The D-Wave approach employs the dwave-neal simulated annealing engine with various parameter settings, while the proposed model introduces a decomposition-based framework combined with adaptive parameter control and iterative refinement. The experimental results demonstrate that the proposed model consistently outperforms the conventional approach in terms of solution quality, achieving significantly lower energy values across all problem instances. In particular, for the TSP gr24 problem, the proposed model achieves near-optimal solutions with substantially reduced computation time. For large-scale problems such as AES and load balancing, the proposed model maintains scalability and robustness, whereas the conventional approach suffers from increased computational cost and performance degradation. Although the proposed method introduces additional computational steps, its hybrid structure effectively mitigates limitations related to local minima, parameter sensitivity, and scalability. These findings indicate that integrating classical optimization techniques with quantum-inspired methods is essential for practical applications. The proposed model provides a promising framework for solving complex real-world optimization problems and highlights the importance of hybrid approaches in advancing quantum annealing technologies.
This study investigates the application of quantum annealing in solving logistics and scheduling problems, areas traditionally challenged by combinatorial complexity. Using a case study approach, quantum annealing was applied to optimize delivery routing and job-shop scheduling problems. The methodology incorporated D-Wave's quantum processing unit (QPU), and performance was benchmarked against classical simulated annealing. Results indicate a significant improvement in computational efficiency and solution optimality, particularly for mid-sized problem instances. The research identifies key parameters influencing performance and provides insights into hybrid quantum-classical integration. These findings contribute to the growing field of quantum computing applications in operations research. Keywords: Quantum annealing, logistics optimization, scheduling algorithms, quantum computing, operations research