Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler

• URL: http://arxiv.org/abs/2212.06979v1
• Date: Wed, 14 Dec 2022 02:10:20 GMT
• Title: Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler
• Authors: Kentaro Kubo and Hayato Goto
• Abstract summary: We numerically demonstrate a high-performance parametric gate for highly detuned fixed-frequency qubits. We can achieve another kind of entangling gate called a CZ gate with an average fidelity over 99.99$%$ and a gate time of about 18 ns.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: High-performance two-qubit gates have been reported with superconducting qubits coupled via a single-transmon coupler (STC). Most of them are implemented for qubits with a small detuning since reducing residual $ZZ$ coupling for highly detuned qubits by an STC is challenging. In terms of the frequency crowding and crosstalk, however, highly detuned qubits are desirable. Here, we numerically demonstrate a high-performance parametric gate for highly detuned fixed-frequency qubits using a recently proposed tunable coupler called a double-transmon coupler (DTC). Applying an ac flux pulse, we can perform a maximally entangling universal gate ($\sqrt{\rm iSWAP}$) with an average fidelity over 99.99$\%$ and a short gate time of about 24 ns. This speed is comparable to resonance-based gates for slightly detuned tunable qubits. Moreover, using a dc flux pulse alternatively, we can achieve another kind of entangling gate called a CZ gate with an average fidelity over 99.99$\%$ and a gate time of about 18 ns. Given the frexibility and feasible settings, we can expect that the DTC will contribute to realizing a high-performance quantum computer in the near future.

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