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Machine learning applied to the quantum circuit layout problem

André Filipe Mestre Mendes

Published Apr 1, 2025• 0 citations
OpenAlex

Abstract

This dissertation presents an innovative approach to the Quantum Circuit Layout problem by leveraging advanced Machine Learning techniques, specifically Graph Neural Networks. The Quantum Circuit Layout problem is crucial for optimizing the placement and routing of qubits in quantum circuits, particularly under the constraints of current quantum hardware. By establishing graph representations for the quantum circuits and computers, we provide a foundation for understanding the complexity of the Quantum Circuit Layout problem, demonstrating its equivalence to the well-studied Subgraph Isomorphism problem, which is known to be NP-Complete. Our proposed solution, the Adaptive Edge-Deleting Network, employs a novel adaptive edgedeleting mechanism to enhance the extraction of relevant features from these graphs while maintaining the structural integrity essential for subgraph matching. By iteratively refining node representations through neural message passing and incorporating a unique attention mechanism, Adaptive Edge-Deleting Network significantly improves the efficiency of graph embedding allowing for a novel way to solve the Quantum Circuit Layout problem.

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This dissertation presents an innovative approach to the Quantum Circuit Layout problem by leveraging advanced Machine Learning techniques, specifically Graph Neural Networks. The Quantum Circuit Layout problem is crucial for optimizing the placement and routing of qubits in quantum circuits, particularly under the constraints of current quantum hardware. By establishing graph representations for the quantum circuits and computers, we provide a foundation for understanding the complexity of the Quantum Circuit Layout problem, demonstrating its equivalence to the well-studied Subgraph Isomorphism problem, which is known to be NP-Complete. Our proposed solution, the Adaptive Edge-Deleting Network, employs a novel adaptive edgedeleting mechanism to enhance the extraction of relevant features from these graphs while maintaining the structural integrity essential for subgraph matching. By iteratively refining node representations through neural message passing and incorporating a unique attention mechanism, Adaptive Edge-Deleting Network significantly improves the efficiency of graph embedding allowing for a novel way to solve the Quantum Circuit Layout problem.
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This paper introduces a novel approach to graph neural networks (GNNs) – the 'Quantum Adaptive Graph Neural Network' – leveraging quantum self-adaptation to enhance both expressiveness and computational efficiency. Traditional GNNs often struggle with the inherent complexities of graph data and require substantial computational resources. We propose a new architecture that employs quantum mechanics to simulate graph structures, allowing the network to learn more robust representations. This approach, dubbed Quantum Adaptive Graph Neural Network (QAGNN), utilizes quantum machine learning algorithms to improve the network's ability to capture intricate relationships within the graph. The paper details the core mechanism, its mathematical foundations, and preliminary experimental results demonstrating significant improvements in various graph classification tasks compared to traditional GNNs. We present a comprehensive analysis of the QAGNN's performance and discuss potential future research directions.
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Quantum circuit compilation is a crucial step in realizing quantum algorithms on near-term quantum hardware. Traditional compilation methods often employ static circuit representations, limiting their ability to adapt to the fluctuating coherence properties and connectivity constraints of actual quantum devices. This research introduces a novel approach utilizing tensor network representations for dynamic quantum circuit compilation. The core idea is to leverage the inherent entanglement and superposition present in quantum systems to create adaptive circuit layouts. Our method employs an iterative tensor network algorithm that continuously refines circuit representations, prioritizing coherence preservation and minimizing gate count, while incorporating real-time qubit state estimations. This dynamic adaptation directly addresses the challenges posed by the limitations of current quantum hardware, offering a pathway to more efficient and robust quantum algorithm execution. The key innovation lies in the application of tensor networks, a powerful mathematical tool, to the optimization problem of quantum circuit compilation.
Quantum computing is a quickly growing field with great potential for future technology. Quantum computers in the current noisy intermediate-scale quantum (NISQ) era face two major limitations - qubit count and error vulnerability. Although quantum error correction (QEC) methods exist, they are not applicable to the current size of computers, requiring thousands of qubits, while current NISQ systems have hundreds at most. It is therefore imperative to improve the reliability of the circuits as much as possible to make them robust to the errors that will occur. One common approach is to adjust the compilation process of a circuit to create a final circuit with improved reliability. However, there are many decisions to be made when compiling that affect the final performance of the circuit, two of the most critical ones being the mapping of logical to physical qubits (the qubit allocation problem) and the movement of qubits to satisfy two-qubit gate adjacency requirements (the qubit routing problem). We focus on solving the qubit allocation problem and identifying initial layouts that reduce error. To identify these layouts, we combine reinforcement learning with a graph neural network (GNN)-based Q-network for analyzing both the connections and error rates of the graph-like backend of superconducting quantum computers to make mapping decisions, creating a Graph Neural Network Assisted Compilation (GNAQC) strategy. We provide both the circuit and the properties of the target backend as input to guide the decision-making process. We work with the IBM Qiskit API to compile and simulate our quantum circuits. We train the architecture using a set of four backends and six circuits and find that GNAQC generally outperforms pre-existing qubit allocation algorithms, increasing final relative output fidelity by roughly 12.7%.
Quantum computing offers a promising avenue to reduce growing machine learning model complexity as required in large language models and simulation models for weather forecasts, financial forecasts, or engineering. Graph neural networks are a particular class of machine learning models that have garnered much attention for their ability to deal well with structured data. We investigate how to enhance existing GNNs and find through the inductive bias that quantum circuits are used best to encode node features. The proposed Quantum Feature Embeddings (QFEs) turn raw input features into quantum states, enabling non-linear and entangled representations. In particular, QFEs provide normalized, non-redundant weight matrices in an exponentially larger feature space and require much fewer qubits than fully quantum graph neural networks. On standard graph benchmark datasets, we showcase that for the same parameter count QFEs perform better than their classical counterpart, and are able to match the performance of an exponentially larger model. Finally, we study the potential benefit of using a hybrid quantum graph neural network over a classic alternative on a concrete use case, laser cutting. We find that the proposed model has the performance and thus the near-term potential to uplift these business applications.