A Hybrid Quantum-Classical Approach to the Electric Mobility Problem

TL;DR

This paper introduces a hybrid quantum-classical method for solving the complex Electric Vehicle Fleet Charging problem, leveraging quantum annealing to improve scalability and solution quality over classical methods.

Contribution

It presents a novel hybrid approach that reformulates the master problem as a quadratic unconstrained binary optimization, enabling quantum annealing for large-scale electric vehicle scheduling.

Findings

Classical solvers perform comparably to traditional MILP methods in solution quality.

The hybrid approach scales better to larger problem instances.

Initial quantum hardware results show potential for solving small instances.

Abstract

We suggest a hybrid quantum-classical routine for the NP-hard Electric Vehicle Fleet Charging and Allocation Problem. The original formulation is a Mixed Integer Linear Program with continuous variables and inequality constraints. To separate inequality constraints that are difficult for quantum routines we use a decomposition in master and pricing problems: the former targets the assignment of vehicles to reservations and the latter suggests vehicle exploitation plans that respect the battery state-of-charge constraints. The master problem is equivalent to the search for an optimal set partition. In our hybrid scheme, the master problem is reformulated in a quadratic unconstrained binary optimization problem which can be solved with quantum annealing on the DWave Advantage system. On large instances, we benchmark the performance of the decomposition technique with classical and quantum-inspired metaheuristics: simulated annealing, tabu search, and vector annealing by NEC. The numerical results with purely classical solvers are comparable to the solutions from the traditional mixed integer linear programming approaches in terms of solution quality while being faster. In addition, it scales better to larger instances. The major advantage of the proposed approach is that it enables quantum-based methods for this realistic problem with many inequality constraints. We show this by initial studies on DWave hardware where optimal solutions can be found for small instances.