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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Quantum algorithms for optimal graph traversal problems

Sebastian Dörn

Published Apr 27, 2007• 11 citations
Publisher

Abstract

We study the quantum complexity of algorithms for optimal graph traversal problems. We look at eulerian tours, optimal postman tours, approximation of travelling salesman tours and self avoiding walks. We present quantum algorithms and quantum lower bounds for these problems. Our results improve the best classical algorithms for the corresponding problems.

DOI
10.1117/12.719158

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We study the quantum complexity of algorithms for optimal graph traversal problems. We look at eulerian tours, optimal postman tours, approximation of travelling salesman tours and self avoiding walks. We present quantum algorithms and quantum lower bounds for these problems. Our results improve the best classical algorithms for the corresponding problems.
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.
This paper investigates the application of quantum walk algorithms to graph traversal problems. Traditional graph traversal algorithms often suffer from performance limitations when dealing with large and complex graphs due to their inherent sequential nature. We propose utilizing quantum walks, quantum analogs of random walks, as a potential solution. Quantum walks leverage quantum superposition and interference to enable more efficient exploration of the graph. We present a theoretical framework for designing quantum walk-based algorithms for graph traversal, focusing on key aspects such as Hamiltonian construction, walker evolution, and measurement strategies. Our work demonstrates the potential for exponential speedups for specific graph algorithms compared to their classical counterparts. We analyze the core principles underpinning this approach and highlight the advantages of quantum walk based algorithms for graph traversal.
Graph partitioning is a crucial problem in computer science with applications in diverse areas like VLSI design, image segmentation, and network analysis. Traditional classical algorithms often face significant challenges when dealing with large and complex graphs, leading to increased computational time and memory requirements. This paper explores the potential of quantum walk algorithms to address this issue. We propose a framework for leveraging quantum walk algorithms to efficiently explore the connectivity structure of a graph and identify optimal partitions. The core idea involves mapping the graph's nodes and edges onto a quantum system and utilizing the inherent parallelism of quantum walks to traverse the graph. We present a theoretical analysis of the algorithm's potential speedup compared to classical approaches, focusing on scenarios where quantum computation offers a significant advantage. Specifically, we formulate the graph partitioning problem as a search problem on a graph represented as a quantum walk, considering the Hamiltonian operator and its eigenstates for efficient traversal. The effectiveness of the algorithm is dependent on the graph's structure and the ability to accurately simulate the quantum walk. The presented methodology provides a novel approach to graph partitioning, potentially leading to substantial performance improvements for large, complex graphs.
This paper explores the application of quantum walk algorithms to graph traversal and search problems. Classical algorithms often struggle with the computational complexity of traversing and searching large graphs, leading to significant time and resource limitations. Quantum walks, utilizing superposition and interference, offer a potential pathway to achieve exponential speedups. This work details the theoretical framework for applying quantum walks to graph problems, specifically focusing on traversal and search tasks. We present a generalized approach for mapping graph structures onto quantum walk systems and discuss the key mathematical formulations involved. The core of our investigation revolves around the construction of quantum walk operators that mimic the movement and interaction rules inherent in graph traversal. We analyze the evolution of the quantum walk state and derive expressions for the probability of reaching a specific node in the graph. Furthermore, we examine the impact of graph topology on the performance of the quantum walk, highlighting the potential for tailored algorithms to exploit specific graph structures. The results demonstrate the theoretical feasibility of quantum walk algorithms for significantly accelerating graph traversal and search operations, contributing to advancements in areas such as network analysis, database management, and artificial intelligence.