Speeding up Quantum Annealing with Engineered Dephasing

Abstract

Building on the insight that engineered noise, specifically, engineered dephasing can enhance the adiabaticity of controlled quantum dynamics, we investigate how a dephasing-generating coupling to an auxiliary quantum system affects quantum annealing protocols. By calculating the exact reduced system dynamics, we show how this coupling enhances the system's adiabaticity solely through a coherent mechanism - an effective energy rescaling. We show that it can lead to an annealing speedup linearly proportional to the strength of the coupling. We discuss the experimental feasibility of the protocols, and investigate the trade-off between fidelity and implementability by examining two modified versions with fewer types of required physical couplings.

12 pages, 5 figures

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Cited by in corpus (4)

• Engineering the uncontrollable: Steering noisy spin-correlated radical-pairs with coherent and incoherent control
• Suppressing excitations in the nonlinear Landau-Zener model
• Trajectory-independent speed limits for controlled open quantum systems
• Quantitative analysis of the effectiveness of mid-anneal measurement in quantum annealing