Control the qubit-qubit coupling in the superconducting circuit with double-resonator couplers

Abstract

We propose a scheme of using two fixed frequency resonator couplers to tune the coupling strength between two Xmon qubits. The induced indirect qubit-qubit interactions by two resonators could offset with each other, and the direct coupling between two qubits are not necessarily for switching off. The small direct qubit-quibt coupling could effectively suppress the frequency interval between switching off and switching on, and globally suppress the second and third-order static ZZ couplings. The frequencies differences between resonator couplers and qubits readout resonators are very large, this might be helpful for suppressing the qubits readout errors. The cross-kerr resonant processes between a qubit and two resonators might induce pole and affect the crosstalks between qubits. The double resonator couplers could unfreeze the restrictions on capacitances and coupling strengths in the superconducting circuit, and it can also reduce the flux noises and globally suppress the crosstalks.

arXiv comment19 page, 8 figures Accepted by Physical Review A

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Cited by in corpus (4)

• High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers
• Controllable non-Hermitian qubit-qubit Coupling in Superconducting quantum Circuit
• Control the qubit-qubit coupling with double superconducting resonators
• On-chip Frequency divider in superconducting quantum circuit