Quarter-wave Resonator Based Tunable Coupler for Xmon Qubits

Abstract

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.

arXiv comment8 pages, 5 figures

References in corpus (23)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Charge insensitive qubit design derived from the Cooper pair box
• Strong quantum computational advantage using a superconducting quantum processor
• Qubit architecture with high coherence and fast tunable coupling
• A tunable coupling scheme for implementing high-fidelity two-qubit gates
• Observation of Entangled States of a Fully Controlled 20-Qubit System
• Quantum walks on a programmable two-dimensional 62-qubit superconducting processor
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit
• High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits
• Demonstration of a High-Fidelity CNOT for Fixed-Frequency Transmons with Engineered ZZ Suppression
• Selective coupling of superconducting qubits via tunable stripline cavity
• Circuit QED with fluxonium qubits: theory of the dispersive regime
• Observation of a symmetry-protected topological time crystal with superconducting qubits
• Parametric resonance in tunable superconducting cavities
• Diabatic gates for frequency-tunable superconducting qubits
• Tunable coupler for realizing a controlled-phase gate with dynamically decoupled regime in a superconducting circuit
• RFSQUID-Mediated Coherent Tunable Coupling Between a Superconducting Phase Qubit and a Lumped Element Resonator
• Whole-device entanglement in a 65-qubit superconducting quantum computer
• Floating tunable coupler for scalable quantum computing architectures
• Suppression of static ZZ interaction in an all-transmon quantum processor
• Superconducting coupler with exponentially large on-off ratio
• Dynamical Casimir effect in a double tunable superconducting circuit

Cited by in corpus (5)

• Tunable Coupling Architectures with Capacitively Connecting Pads for Large-Scale Superconducting Multi-Qubit Processors
• Control the qubit-qubit coupling in the superconducting circuit with double-resonator couplers
• 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