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We consider qubit coupling resulting from the capacitive coupling between twodouble quantum dot (DQD) single-triplet qubits. Calculations of the couplingwhen the two DQDs are detuned symmetrically or asymmetrically are performedusing a full configuration interaction (CI). The full CI reveals behavior thatis not observed by more commonly used approximations such as Heitler London orHund Mulliken, particularly related to the operation of both DQDs in the (0,2)charge sector. We find that there are multiple points in detuning-space where atwo-qubit entangling gate can be realized, and that trade-offs between couplingmagnitude and sensitivity to fluctuations in detuning make a case for operatingthe gate in the (0,2) regime not commonly considered.

Configuration interaction calculations of the controlled phase gate in double quantum dot qubits