Decoherence of spin qubits due to a nearby charge fluctuator in gate-defined double dots
Decoherence of spin qubits due to a nearby charge fluctuator in gate-defined double dots
The effects of a nearby two-level charge fluctuator on a double-dot two-spin qubit are studied theoretically. Assuming no direct tunneling between the charge fluctuator and the qubit quantum dots, the Coulomb couplings between the qubit orbital states and the fluctuator are calculated within the Hund-Mulliken framework to quadrupole-quadrupole order in …