Probing Residual Noise at a Decoherence Sweet Spot in a ${}^{28}$Si/SiGe Spin Qubit

Shinwoo Lee, Hanseo Sohn, Jaemin Park +7

In ${}^{28}$Si/SiGe spin qubits with micromagnets, the longitudinal stray field gradient transduces charge noise into qubit frequency noise and limits coherence. We compare two neigh…