Warm Start Adaptive-Bias Quantum Approximate Optimization Algorithm

• URL: http://arxiv.org/abs/2503.20048v1
• Date: Tue, 25 Mar 2025 20:10:40 GMT
• Title: Warm Start Adaptive-Bias Quantum Approximate Optimization Algorithm
• Authors: Yunlong Yu, Xiang-Bin Wang, Nic Shannon, Robert Joynt,
• Abstract summary: Quantum approximate optimization algorithm (QAOA) is well adapted for such a "warm start" approach.<n>We find that the warm start adaptive-bias QAOA by the Goemans-Williamson (GW) algorithm outperforms previously proposed warm start variants on problems with $40$ to $180$ qubits.
• Score: 7.971068453222675
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the search for quantum advantage in real--world problems, one promising avenue is to use a quantum algorithm to improve on the solution found using an efficient classical algorithm. The quantum approximate optimization algorithm (QAOA) is particularly well adapted for such a "warm start" approach, and can be combined with the powerful classical Goemans-Williamson (GW) algorithms based on semi-definite programming. Nonetheless, the best way to leverage the power of the QAOA remains an open question. Here we propose a general model that describes a class of QAOA variants, and use it to explore routes to quantum advantages in a canonical optimization problem, MaxCut. For these algorithms we derive analytic expectation values of the cost Hamiltonian for the MaxCut problem in the level-1 case. Using these analytic results we obtain reliable averages over many instances for fairly large numbers of qubits. We find that the warm start adaptive-bias QAOA (WS-ab-QAOA) initialized by the GW algorithm outperforms previously proposed warm start variants on problems with $40$ to $180$ qubits. To assess whether a quantum advantage exists with this algorithm, we did numerical simulations with up to $1000$ qubits to see whether the level-1 WS-ab-QAOA can improve the GW solution for 3-regular graphs. In fact the improvement in the $1000$-qubit case even in level 1 can only be matched by the GW algorithm after about $10^{5.5}$ random projections performed after the semi-definite program stage. This work gives evidence that the final stage of optimization after an efficient classical algorithm has produced an approximate solution may be a place where quantum advantages can be realized.

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