We propose a simple but versatile protocol to engineer time-dependent Hamiltonians inversely for geometric quantum computation. By utilizing SU(2) transformation, a speedup goal on gate operation is achieved with more freedom to design the control parameters. As an application, this protocol enables the conventional and unconventional nonadiabatic geometric quantum gates with desired evolution paths by controlling the microwave pulses in the diamond nitrogen-vacancy center system. We show that the inversely designed Hamiltonian can fulfill the geometric gate with more economical evolution time and further reduces the influence of the environment noise on gate fidelity.
@article{arxiv.2010.02064,
title = {Implementing conventional and unconventional nonadiabatic geometric quantum gates via SU(2) transformations},
author = {Jian-jian Cheng and Lin Zhang},
journal= {arXiv preprint arXiv:2010.02064},
year = {2021}
}