Berry-phase gates for fast and robust control of atomic clock states
Yunheung Song, Jongseok Lim, Jaewook Ahn · Physical Review Research · 2020
This paper implements Berry-phase gates of atomic clock states with picosecond time-scale laser pulses, in which the qubit system of atomic hyperfine ground states adiabatically evolves on a closed loop to pick up a non-zero geometric phase that renders into the qubit rotation. The characteristic features are the gate speed and robustness against control fluctuations, obtained as a result of the geometrical nature of these gates that makes them insensitive to the details of the trajectory and hence the laser parameters, which can potentially resolve the ubiquitous decoherence and reliability issues in quantum information processing.