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The effects of a nearby two-level charge fluctuator on a double-dot two-spinqubit are studied theoretically. Assuming no direct tunneling between thecharge fluctuator and the qubit quantum dots, the Coulomb couplings between thequbit orbital states and the fluctuator are calculated within the Hund-Mullikenframework to quadrupole-quadrupole order in a multipole expansion. We identifyand quantify the coupling term that entangles the qubit to the fluctuator andanalyze qubit decoherence effects that result from the decay of the fluctuatorto its reservoir. Our results show that the charge environment can severelyimpact the performance of spin qubits, and indicate working points at whichthis decoherence channel is minimized. Our analysis also suggests that anancillary double-dot can provide a convenient point for single-qubit operationsand idle position, adding flexibility in the quantum control of the two-spinqubit.

Decoherence of spin qubits due to a nearby charge fluctuator in gate-defined double dots