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We propose a scheme of tunable coupler based on quarter-wave resonator forscalable quantum integrated circuits. The open end of the T-type resonator iscapacitively coupled to two Xmon qubits, while another end is an asymmetricdc-SQUID which dominates the inductive energy of coupler resonator. Thedc-Current applied through the flux bias line could change the magnetic fluxinside the dc-SQUID, so the frequency of coupler resonator can be effectivelytuned and the qubit-qubit coupling can be totally switched off. As the increaseof junction asymmetry for the dc-SQUID, the coupling of SQUID's effective phasedifference and cavity modes become smaller at required working frequency regimeof coupler resonator, and this could reduce the descent of the resonator'squality factor. The separation between two cross-capacitor can be larger withhelp of transverses width of the T-shape resonator, and then the ZZ crosstalkcoupling can be effectively suppressed. The asymmetric dc-SQUID is about 5millimeters away from the Xmon qubits and only needs a small current on theflux bias line, which in principle creates less flux noises to superconductingXmon qubits.

Quarter-wave Resonator Based Tunable Coupler for Xmon Qubits