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In double quantum dot singlet-triplet qubits, the exchange interaction isused in both quantum gate operation and the measurement of the state of thequbit. The exchange can be controlled electronically by applying gate voltagepulses. We simulate the exchange induced charge state transitions in one andtwo singlet-triplet qubit systems using the exact diagonalization method. Wefind that fast detuning pulses may result in leakage between different singletcharge states. The leakage could cause measurement errors and hinder quantumgate operation for example in the case of the two-qubit Coulomb gate.

Non-adiabatic charge state transitions in singlet-triplet qubits