@article{oai:ynu.repo.nii.ac.jp:00009300,
 author = {Sekiguchi, Yuhei and Niikura, Naeko and Kuroiwa, Ryota and Kano, Hiroki and Kosaka, Hideo},
 journal = {Nature Photonics},
 month = {Apr},
 note = {The realization of fast fault-tolerant quantum gates on a single spin is the core requirement for solid-state quantum-information processing. As polarized light shows geometric interference, spin coherence is also geometrically controlled with light via the spin–orbit interaction. Here, we show that a geometric spin in a degenerate subspace of a spin-1 electronic system under a zero field in a nitrogen vacancy centre in diamond allows implementation of optical non-adiabatic holonomic quantum gates. The geometric spin under quasi-resonant light exposure undergoes a cyclic evolution in the spin–orbit space, and acquires a geometric phase or holonomy that results in rotations about an arbitrary axis by any angle defined by the light polarization and detuning. This enables universal holonomic quantum gates with a single operation. We demonstrate a complete set of Pauli quantum gates using the geometric spin preparation and readout techniques. The new scheme opens a path to holonomic quantum computers and repeaters.},
 pages = {309--314},
 title = {Optical holonomic single quantum gates with a geometric spin under a zero field},
 volume = {11},
 year = {2017}
}