Interacting Two-Level Systems as a Source of 1/f Noise in Semiconductor Quantum Dot Qubits

Charge noise in quantum dots has been observed to have a 1/f spectrum. We propose a model in which a pair of quantum dots are coupled to a 2D bath of fluctuators that have electric dipole moments and that interact with each other, i.e., with the other fluctuators. We simulate the bath of electric dipole fluctuators with a 2D Ising spin glass in the presence of a ground plane representing metal gates above the oxide layer containing the fluctuators. We calculate the resulting fluctuations in the electric potential at the two quantum dots that lie below the oxide layer. We report on the electric potential noise spectra at the quantum dots and the cross correlation in the noise between the two quantum dots.