Phys.org August 13, 2018
Researchers in Japan have demonstrated non-adiabatic and non-abelian holonomic quantum gates over a geometric spin qubit on an electron or nitrogen nucleus, which paves the way to realizing a universal quantum computer. To avoid unwanted interference, they used a degenerate subspace of the triplet spin qutrit to form an ideal logical qubit in an NV center. This method facilitated fast and precise geometric gates at a temperature below 10 K, and the gate fidelity was limited by radiative relaxation. Based on this method, in combination with polarized microwaves, they succeeded in the manipulation of the geometric phase in an NV center in diamond under a zero-magnetic field at room temperature… read more. Open Access TECHNICAL ARTICLE
Nitrogen-vacancy (NV) center in diamond with two crossed wires for holonomic quantum gates over the geometric spin qubit with a polarized microwave. Credit: Yokohama National University