Abstract The efficient resolution of optimization problems is one of the key issues in today’s industry. This task relies mainly on classical algorithms that present scalability problems and processing limitations. Quantum computing has emerged to challenge these types of problems. In this paper, we focus on the Metropolis-Hastings quantum algorithm, which is based on quantum walks. We use this algorithm to build a quantum software tool called Quantum Metropolis Solver (QMS). We validate QMS with the N-Queen problem to show a potential quantum advantage in an example that can be easily extrapolated to an Artificial Intelligence domain. We carry out different simulations to validate the performance of QMS and its configuration.
Abstract The efficient resolution of optimization problems is one of the key issues in today’s industry. This task relies mainly on classical algorithms that present scalability problems and processing limitations. Quantum computing has emerged to challenge these types of problems. In this paper, we focus on the Metropolis-Hastings quantum algorithm, which is based on quantum walks. We use this algorithm to build a quantum software tool called Quantum Metropolis Solver (QMS). We validate QMS with the N-Queen problem to show a potential quantum advantage in an example that can be easily extrapolated to an Artificial Intelligence domain. We carry out different simulations to validate the performance of QMS and its configuration.
We present a detailed circuit implementation of Szegedy's quantization of the Metropolis-Hastings walk. This quantum walk is usually defined with respect to an oracle. We find that a direct implementation of this oracle requires costly arithmetic operations. We thus reformulate the quantum walk, circumventing its implementation altogether by closely following the classical Metropolis-Hastings walk. We also present heuristic quantum algorithms that use the quantum walk in the context of discrete optimization problems and numerically study their performances. Our numerical results indicate polynomial quantum speedups in heuristic settings.
This thesis explores hybrid algorithms that combine classical and quantum computing to enhance the performance of classical algorithms. Two approaches are studied: a hybrid search and sample optimization algorithm and a classical algorithm that assesses the cost and performance of quantum algorithms in chemistry. Hybrid algorithms are vital due to limitations in both classical and quantum computing, offering a solution by leveraging the strengths of both. The first algorithm, quantum Metropolis Solver (QMS), adapts a quantum walk to a Metropolis-Hastings algorithm for industrial applications, demonstrating advantages over classical counterparts in various sectors. The second algorithm, TFermion, is a classical tool for evaluating the cost of T-type gates in quantum chemistry algorithms, aiding in the comparison and execution of these algorithms on real quantum hardware, and applied to the design of more efficient electric batteries.
Constraint satisfaction problems (CSPs) represent a significant class of computational problems that arise in various domains, including artificial intelligence, optimization, and cryptography. Traditional algorithms for solving CSPs often struggle with scalability, particularly when dealing with complex problems and large search spaces. This research investigates the potential of utilizing quantum walks, a quantum analogue of random walks, to develop more efficient algorithms for CSPs. We explore the theoretical underpinnings of quantum walk-based approaches and demonstrate their ability to explore solution spaces more effectively than classical methods. The core claim is that by leveraging quantum mechanics, we can significantly reduce the computational cost associated with solving CSPs. We present a framework for formulating CSPs as quantum walk problems and outline key considerations for designing and implementing such algorithms. The work highlights the promise of quantum computing in tackling intractable problems within the CSP domain.
Quantum computing, leveraging quantum mechanics, promises to enhance optimization processes in artificial intelligence (AI) by addressing challenges faced by classical computing in solving complex problems. This study investigates the role of quantum computing in optimizing AI tasks, focusing on algorithms such as Quantum Approximate Optimization Algorithm (QAOA) and Quantum Annealing (QA) for improved efficiency in optimization. A hybrid quantum-classical approach was used to evaluate the performance of quantum algorithms in optimization tasks, including combinatorial optimization and machine learning model tuning. QAOA and QA were applied to benchmark problems, such as Max-Cut and Traveling Salesman Problem (TSP). The study involved a comparative analysis between quantum algorithms and classical optimization techniques using performance metrics like solution quality, computational time, and scalability. Data were gathered through simulation on a quantum computing platform, and results were analyzed using statistical methods to assess improvements. The results showed that quantum computing significantly outperformed classical methods in solving large-scale optimization problems. QAOA demonstrated a 30% improvement in solution quality for Max-Cut problems, and QA showed a 25% faster convergence in TSP compared to classical algorithms. Quantum algorithms demonstrated scalability advantages as the problem size increased, with quantum methods achieving up to a 40% reduction in computational time for large instances. Furthermore, 70% of the tested cases showed significant improvements in solution accuracy, confirming the potential of quantum computing in real-world AI applications. Quantum computing, through QAOA and QA, offers substantial improvements in solving complex optimization problems in AI, presenting a transformative opportunity for the future of optimization algorithms.
This paper investigates the application of quantum-inspired concepts to enhance the performance of random walk algorithms for optimization problems. Classical random walk algorithms are susceptible to getting trapped in local optima, limiting their efficacy in tackling complex and high-dimensional search spaces. To address this limitation, we propose a novel approach that incorporates principles of quantum superposition and tunneling into the random walk process. The algorithm leverages these concepts to enable more extensive exploration of the search space, thereby increasing the probability of converging towards the global optimum. We present a detailed formulation of the algorithm, outlining the key parameters and their influence on the optimization process. The theoretical analysis demonstrates the potential advantages of this quantum-inspired approach compared to traditional random walk methods. The algorithm's ability to escape local minima is evaluated through simulations, showcasing its effectiveness in a variety of benchmark optimization problems. The results highlight the promise of quantum-inspired techniques in improving the robustness and efficiency of random walk algorithms, offering a viable strategy for solving challenging optimization tasks.
This paper investigates the application of quantum walk algorithms to graph traversal and optimization problems. Classical graph algorithms often struggle with scalability and efficiency when dealing with large and complex graphs. Quantum walks, utilizing the principles of superposition and interference, offer a potential solution by providing a fundamentally different approach to graph exploration. We present a framework for constructing quantum walk-based algorithms tailored for graph traversal, focusing on algorithms that can efficiently explore the graph space. Furthermore, we explore the integration of these algorithms into graph optimization problems, aiming to achieve speedups compared to traditional classical methods. The core idea is to represent graph nodes and edges as quantum states, enabling parallel exploration of the graph through quantum superposition. We explore the mathematical formulation of these algorithms, highlighting key concepts like Hilbert space representation, transition amplitudes, and interference effects. The results presented demonstrate the potential for quantum walk algorithms to significantly improve the performance of graph-related tasks.