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We consider a double-quantum-dot (DQD) qubit which contains six electronsinstead of the usual one or two. In this spin qubit, quantum information isencoded in a low-lying singlet-triplet space much as in the case of atwo-electron DQD qubit. We find that initialization, manipulation, and read-out can be performed similarly to the two-electron case, and that energy gapsremain large enough that these operations can be performed robustly. Weconsider DQD potentials with parameters chosen to be representative of currentexperimental capabilities. Results are obtained using two complementary fullconfiguration interaction methods.

Six-electron semiconductor double quantum dot qubits