Realisation of adiabatic and diabatic CZ gates in superconducting qubits coupled with a tunable coupler

Abstract

High fidelity two-qubit gates are fundamental for scaling up the superconducting number. We use two qubits coupled via a frequency-tunable coupler which can adjust the coupling strength, and demonstrate the CZ gate using two different schemes, adiabatic and diabatic methods. The Clifford based Randomized Benchmarking (RB) method is used to assess and optimize the CZ gate fidelity. The fidelity of adiabatic and diabatic CZ gates are 99.53(8)% and 98.72(2)%, respectively. We also analyze the errors induced by the decoherence. Comparing to 30 ns duration time of adiabatic CZ gate, the duration time of diabatic CZ gate is 19 ns, revealing lower incoherence error rate $r_{\mathrm{incoherent},\mathrm{int}}^{\prime }$ = 0.0197(5) than $r_{\mathrm{incoherent},\mathrm{int}}$ = 0.0223(3).

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• Realization of high-fidelity CZ gates in extensible superconducting qubits design with a tunable coupler
• High-precision pulse calibration of tunable couplers for high-fidelity two-qubit gates in superconducting quantum processors
• Realizing discrete time crystal in an one-dimensional superconducting qubit chain
• Direct Implementation of High-Fidelity Three-Qubit Gates for Superconducting Processor with Tunable Couplers
• Direct implementation of a perceptron in superconducting circuit quantum hardware
• Tantalum airbridges for scalable superconducting quantum processors
• Charge-parity switching effects and optimisation of transmon-qubit design parameters
• Calibrating quantum gates up to 52 qubits in a superconducting processor