  We present a scheme for correcting for crosstalk- and noise-induced errors in
exchange-coupled singlet-triplet semiconductor double quantum dot qubits. While
exchange coupling allows the coupling strength to be controlled independently
of the intraqubit exchange couplings, there is also the problem of leakage,
which must be addressed. We show that, if a large magnetic field difference is
present between the two qubits, leakage is suppressed. We then develop pulse
sequences that correct for crosstalk- and noise-induced errors and present
parameters describing them for the 24 Clifford gates. We determine the
infidelity for both the uncorrected and corrected gates as a function of the
error-inducing terms and show that our corrected pulse sequences reduce the
error by several orders of magnitude.
