Rapid counter-diabatic sweeps in lattice gauge adiabatic quantum computing

被引:44
|
作者
Hartmann, Andreas [1 ]
Lechner, Wolfgang [1 ,2 ]
机构
[1] Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria
[2] Austrian Acad Sci, Inst Quantum Opt & Quantum Informat, A-6020 Innsbruck, Austria
来源
NEW JOURNAL OF PHYSICS | 2019年 / 21卷 / 04期
基金
奥地利科学基金会;
关键词
quantum computing; adiabatic quantum computing; counter-diabatic driving; SHORTCUTS;
D O I
10.1088/1367-2630/ab14a0
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present a coherent counter-diabatic quantum protocol to prepare ground states in the lattice gauge mapping of all-to-all Ising models (LHZ) with considerably enhanced final ground state fidelity compared to a quantum annealing protocol. We make use of a variational method to find approximate counter-diabatic Hamiltonians that has recently been introduced by Sels and Polkovnikov (2017 Proc. Natl. Acad. Sci. 1143909). The resulting additional terms in our protocol are time-dependent local onsite y-magnetic fields. These additional Hamiltonian terms do not increase the minimal energy gap, but instead compensate for the Berry curvature. A single free parameter is introduced which is optimized via classical updates. The protocol consists only of local and nearest-neighbor terms which makes it attractive for implementation in near term experiments.
引用
收藏
页数:14
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