  We present a simple yet effective strategy to suppress the leakage in the
charge quadrupole qubit system by having the dots in a triangle as opposed to
the linear geometry originally conceived. We find that the tunnel coupling
between the two outmost dots are amplified in triangular triple dots, which
consequently reduces leakage by separating the leaked state and qubit states.
We have found that the leakage can be suppressed by as much as five orders of
magnitude when the dots form an equilateral triangle, with further improvement
of control fidelities possible if composite pulses are applied.
