Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler

• URL: http://arxiv.org/abs/2402.18926v1
• Date: Thu, 29 Feb 2024 07:34:08 GMT
• Title: Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
• Authors: Rui Li, Kentaro Kubo, Yinghao Ho, Zhiguang Yan, Yasunobu Nakamura and Hayato Goto
• Abstract summary: Double-transmon coupler (DTC) aims to achieve both suppressed residual interaction and a fast high-fidelity two-qubit gate simultaneously. We harness the state-of-the-art fabrication techniques and a model-free pulse-optimization process based on reinforcement learning. The performance of the DTC scheme demonstrates its potential as a competitive building block for superconducting quantum processors.
• Score: 1.5286994702306957
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Striving for higher gate fidelity is crucial not only for enhancing existing noisy intermediate-scale quantum (NISQ) devices but also for unleashing the potential of fault-tolerant quantum computation through quantum error correction. A recently proposed theoretical scheme, the double-transmon coupler (DTC), aims to achieve both suppressed residual interaction and a fast high-fidelity two-qubit gate simultaneously, particularly for highly detuned qubits. Harnessing the state-of-the-art fabrication techniques and a model-free pulse-optimization process based on reinforcement learning, we translate the theoretical DTC scheme into reality, attaining fidelities of 99.92% for a CZ gate and 99.98% for single-qubit gates. The performance of the DTC scheme demonstrates its potential as a competitive building block for superconducting quantum processors.

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