Electrically controlled quantum gates for two-spin qubits in two double quantum dots
Electrically controlled quantum gates for two-spin qubits in two double quantum dots
Exchange-coupled singlet-triplet spin qubits in two gate-defined double quantum dots are considered theoretically. Using charge density operators to describe the double-dot orbital states, we calculate the Coulomb couplings between the qubits and identify optimal bias points for single- and two-qubit operations, as well as convenient idle positions. The same intuitive …