Abstract: An exemplary tundable capacitor in a quantum system includes a pair of qubits, and a capacitive coupling element coupled between the pair of qubits. The capacitive coupling element includes a plurality of gate terminals. The capacitive coupling element is configured to receive a respective gate voltage at each of the plurality of gate terminals and to adjust a capacitance of the capacitive coupling element in response to the respective gate voltage received at each of the plurality of gate terminals. The capacitance of the capacitive coupling element is configured to control a coupling strength between the pair of qubits.