A system comprising: a plurality of classical controls, a plurality of tunable transmon qubits and a common digital-to-analog converter, wherein each classical control is configured to provide a control flux to a tunable transmon qubit of the plurality of tunable transmon qubits and comprises a an RQL driver providing current to a current loop inductively coupled to the tunable transmon qubit; wherein each tunable transmon qubit of the plurality of tunable transmon qubits comprises: a first Josephson junction on a first path between a transmission line and a circuit ground; second and third Josephson junctions (122, 124) arranged in parallel with one another on a second path between the transmission line and the circuit ground to form a direct current superconducting quantum interference device, DC SQUID, the DC SQUID being in parallel with the first Josephson junction; a capacitor in parallel with the first Josephson junction and the DC SQUID on a third path between the transmission line and the circuit ground as to form, in combination with the first path, an outer loop of the tunable transmon qubit; and a bias circuit (142, 162) configured to provide a constant bias flux to a selected one of the DC SQUID and the outer loop of the tunable transmon qubit in order to adjust a determined frequency curve of the tunable transmon qubit, the frequency curve representing a frequency of a first energy level transition as a function of a control flux; wherein the respective RQL drivers associated with the plurality of tunable transmon qubits are operatively connected to the common digital-to-analog converter. a plurality of classical controls, a plurality of tunable transmon qubits and a common digital-to-analog converter, wherein each classical control is configured to provide a control flux to a tunable transmon qubit of the plurality of tunable transmon qubits and comprises a an RQL driver providing current to a current loop inductively coupled to the tunable transmon qubit; wherein each tunable transmon qubit of the plurality of tunable transmon qubits comprises: a first Josephson junction on a first path between a transmission line and a circuit ground; second and third Josephson junctions (122, 124) arranged in parallel with one another on a second path between the transmission line and the circuit ground to form a direct current superconducting quantum interference device, DC SQUID, the DC SQUID being in parallel with the first Josephson junction; a capacitor in parallel with the first Josephson junction and the DC SQUID on a third path between the transmission line and the circuit ground as to form, in combination with the first path, an outer loop of the tunable transmon qubit; and a bias circuit (142, 162) configured to provide a constant bias flux to a selected one of the DC SQUID and the outer loop of the tunable transmon qubit in order to adjust a determined frequency curve of the tunable transmon qubit, the frequency curve representing a frequency of a first energy level transition as a function of a control flux; wherein the respective RQL drivers associated with the plurality of tunable transmon qubits are operatively connected to the common digital-to-analog converter. a first Josephson junction on a first path between a transmission line and a circuit ground; second and third Josephson junctions (122, 124) arranged in parallel with one another on a second path between the transmission line and the circuit ground to form a direct current superconducting quantum interference device, DC SQUID, the DC SQUID being in parallel with the first Josephson junction; a capacitor in parallel with the first Josephson junction and the DC SQUID on a third path between the transmission line and the circuit ground as to form, in combination with the first path, an outer loop of the tunable transmon qubit; and a bias circuit (142, 162) configured to provide a constant bias flux to a selected one of the DC SQUID and the outer loop of the tunable transmon qubit in order to adjust a determined frequency curve of the tunable transmon qubit, the frequency curve representing a frequency of a first energy level transition as a function of a control flux; wherein the respective RQL drivers associated with the plurality of tunable transmon qubits are operatively connected to the common digital-to-analog converter.