Customized Quantum Annealing Schedules

作者：Mostafa Khezri, Xi Dai, Rui Yang, Tameem Albash, Adrian Lupaşcu, Daniel A. Lidar · 发表于：Physical Review Applied · 年份：2022 · DOI：10.1103/physrevapplied.17.044005 · 被引用次数：13 · 研究领域：Quantum Computing Algorithms and Architecture、Quantum Information and Cryptography、Quantum and electron transport phenomena

In a typical quantum annealing protocol, the system starts with a transverse field Hamiltonian that is gradually turned off and replaced by a longitudinal Ising Hamiltonian. The ground state of the Ising Hamiltonian encodes the solution to the computational problem of interest, and the state overlap with this ground state gives the success probability of the annealing protocol. The form of the annealing schedule can have a significant impact on the ground-state overlap at the end of the anneal, so precise control over these annealing schedules can be a powerful tool for increasing success probabilities of annealing protocols. Here we show how superconducting circuits, in particular capacitively shunted flux qubits, can be used to construct quantum annealing systems by providing tools for mapping circuit flux biases to Pauli coefficients. We use this mapping to find customized annealing schedules: appropriate circuit control biases that yield a desired annealing schedule, while accounting for the physical limitations of the circuitry. We then provide examples and proposals that utilize this capability to improve quantum annealing performance.