High-Fidelity Single Qubit Gates

Hendrik Bluhm's research group has built on his long experience with GaAs quantum dot qubits, and has set as a definite objective the achievement of the world’s best fidelity quantum gates in this system.

A large step in this direction was accomplished for the singlet-triplet qubit [HB1] with the help of a very extensive initial theoretical exploration of the space of possible driving-pulse trajectories.

These were implemented in the experiment in an adaptive way. Theory says that 99.9% fidelity for quantum gates will be feasible, and these first experiments did not fall far short of this goal.