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Saturation of two-level systems and charge noise in Josephson junction qubits
We study the charge noise ${S}_{Q}$ in Josephson qubits produced by fluctuating two-level systems (TLSs) with electric-dipole moments in the substrate. The TLSs are driven by an alternating electric field of angular frequency $\ensuremath{\Omega}$ and electric field intensity $I$. It is not widely appreciated that TLS in small qubits can …