Hyperfine interaction induced dephasing of coupled spin qubits in semiconductor double quantum dots
Hyperfine interaction induced dephasing of coupled spin qubits in semiconductor double quantum dots
We investigate theoretically the hyperfine-induced dephasing of two-electron-spin states in a double quantum dot with a finite singlet-triplet splitting $J$. In particular, we derive an effective pure dephasing Hamiltonian, which is valid when the hyperfine-induced mixing is suppressed due to the relatively large $J$ and the external magnetic field. Using …