Quantum-Walk-Inspired Dynamic Adiabatic Local Search

• Published in: Entropy
• Main Authors: Chen-Fu Chiang, Paul M. Alsing
• Format: Article
• Language: English
• Published: MDPI AG 2023-08-01
• Subjects: quantum walk; adiabatic quantum computing; adiabatic path scheduling; catalyst Hamiltonian
• Online Access: https://www.mdpi.com/1099-4300/25/9/1287

We investigate the irreconcilability issue that arises when translating the search algorithm from the Continuous Time Quantum Walk (CTQW) framework to the Adiabatic Quantum Computing (AQC) framework. For the AQC formulation to evolve along the same path as the CTQW, it requires a constant energy gap in the Hamiltonian throughout the AQC schedule. To resolve the constant gap issue, we modify the CTQW-inspired AQC catalyst Hamiltonian from an XZ operator to a <i>Z</i> oracle operator. Through simulation, we demonstrate that the total running time for the proposed approach for AQC with the modified catalyst Hamiltonian remains optimal as CTQW. Inspired by this solution, we further investigate adaptive scheduling for the catalyst Hamiltonian and its coefficient function in the adiabatic path of Grover-inspired AQC to improve the adiabatic local search.