Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916495492120576 |
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| author | Li, Rui Kubo, Kentaro Ho, Yinghao Yan, Zhiguang Nakamura, Yasunobu Goto, Hayato |
| author_facet | Li, Rui Kubo, Kentaro Ho, Yinghao Yan, Zhiguang Nakamura, Yasunobu Goto, Hayato |
| contents | 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 99.90% 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_18926 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler Li, Rui Kubo, Kentaro Ho, Yinghao Yan, Zhiguang Nakamura, Yasunobu Goto, Hayato Quantum Physics Applied Physics 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 99.90% 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. |
| title | Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler |
| topic | Quantum Physics Applied Physics |
| url | https://arxiv.org/abs/2402.18926 |