  We propose a scheme of tunable coupler based on quarter-wave resonator for
scalable quantum integrated circuits. The open end of the T-type resonator is
capacitively coupled to two Xmon qubits, while another end is an asymmetric
dc-SQUID which dominates the inductive energy of coupler resonator. The
dc-Current applied through the flux bias line could change the magnetic flux
inside the dc-SQUID, so the frequency of coupler resonator can be effectively
tuned and the qubit-qubit coupling can be totally switched off. As the increase
of junction asymmetry for the dc-SQUID, the coupling of SQUID's effective phase
difference and cavity modes become smaller at required working frequency regime
of coupler resonator, and this could reduce the descent of the resonator's
quality factor. The separation between two cross-capacitor can be larger with
help of transverses width of the T-shape resonator, and then the ZZ crosstalk
coupling can be effectively suppressed. The asymmetric dc-SQUID is about 5
millimeters away from the Xmon qubits and only needs a small current on the
flux bias line, which in principle creates less flux noises to superconducting
Xmon qubits.
