Phantom Edges in the Problem Hamiltonian: A Method for Increasing Performance and Graph Visibility for QAOA

• URL: http://arxiv.org/abs/2411.05216v1
• Date: Thu, 07 Nov 2024 22:20:01 GMT
• Title: Phantom Edges in the Problem Hamiltonian: A Method for Increasing Performance and Graph Visibility for QAOA
• Authors: Quinn Langfitt, Reuben Tate, Stephan Eidenbenz,
• Abstract summary: We present a new QAOA ansatz that introduces only one additional parameter to the standard ansatz. We derive a general formula for our new ansatz at $p=1$ and analytically show an improvement in the approximation ratio for cycle graphs.
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• Abstract: The Quantum Approximate Optimization Algorithm (QAOA) is a variational quantum algorithm designed to solve combinatorial optimization problems. However, a key limitation of QAOA is that it is a "local algorithm," meaning it can only optimize over local properties of the graph for finite circuit depths. In this work, we present a new QAOA ansatz that introduces only one additional parameter to the standard ansatz, regardless of system size, allowing QAOA to "see" more of the graph at a given depth $p$. We achieve this by modifying the target graph to include additional $\alpha$-weighted edges, with $\alpha$ serving as a tunable parameter. This modified graph is then used to construct the phase operator and allows QAOA to explore a wider range of the graph's features for a smaller $p$. We derive a general formula for our new ansatz at $p=1$ and analytically show an improvement in the approximation ratio for cycle graphs. We also provide numerical experiments that demonstrate significant improvements in the approximation ratio for the Max-Cut problem over the standard QAOA ansatz for $p=1$ and $p=2$ on random regular graphs up to 16 nodes.

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