TUNEABLE QUBIT CIRCUIT EMPLOYING TWIST COUPLERS

The present disclosure regards a qubit circuit comprising at least first and second data qubits and a mediator qubit coupling the first and second data qubits in a circuit plane, wherein the first data qubit and the second data qubit are coupled to the mediator qubit by means of respective twist couplers, each twist coupler comprising superconducting regions connected by superconducting transmission lines, wherein at least two of the connecting transmission lines cross each other at a line crossing point where the crossing transmission lines are separated by an insulator layer.