Error-mitigated entanglement-assisted quantum process tomography
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910830449131520 |
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| author | Wu, Zhihao Lao, Lingling Zhuke, Chengqi Liu, Yantong Zhang, Xinfang Xue, Shichuan Deng, Mingtang Wu, Junjie Lu, Kai |
| author_facet | Wu, Zhihao Lao, Lingling Zhuke, Chengqi Liu, Yantong Zhang, Xinfang Xue, Shichuan Deng, Mingtang Wu, Junjie Lu, Kai |
| contents | In the era of noisy intermediate-scale quantum computing, it is of crucial importance to verify quantum processes and extract information. Quantum process tomography is a typical approach, however, both resource-intensive and vulnerable to state preparation and measurement errors. Here, we propose an error-mitigated entanglement-assisted quantum process tomography (EM-EAPT) framework to address these limitations. By leveraging a maximally entangled state to reduce state preparation complexity and integrating error mitigation techniques, our method significantly enhances robustness against SPAM errors. Experimental validation on a superconducting processor demonstrates the efficacy of EM-EAPT for two-qubit and three-qubit quantum processes. Results show more accurate average gate fidelities close to the realistic estimation, achieving 98.1$\pm$ 0.03% for a CNOT gate and 88.1%$\pm$ 0.04% for a cascaded CNOT process after error mitigation, compared to non-mitigated implementations. This work advances practical quantum verification tools for NISQ devices, enabling higher-fidelity characterization of quantum processes under realistic noise conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_10715 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Error-mitigated entanglement-assisted quantum process tomography Wu, Zhihao Lao, Lingling Zhuke, Chengqi Liu, Yantong Zhang, Xinfang Xue, Shichuan Deng, Mingtang Wu, Junjie Lu, Kai Quantum Physics In the era of noisy intermediate-scale quantum computing, it is of crucial importance to verify quantum processes and extract information. Quantum process tomography is a typical approach, however, both resource-intensive and vulnerable to state preparation and measurement errors. Here, we propose an error-mitigated entanglement-assisted quantum process tomography (EM-EAPT) framework to address these limitations. By leveraging a maximally entangled state to reduce state preparation complexity and integrating error mitigation techniques, our method significantly enhances robustness against SPAM errors. Experimental validation on a superconducting processor demonstrates the efficacy of EM-EAPT for two-qubit and three-qubit quantum processes. Results show more accurate average gate fidelities close to the realistic estimation, achieving 98.1$\pm$ 0.03% for a CNOT gate and 88.1%$\pm$ 0.04% for a cascaded CNOT process after error mitigation, compared to non-mitigated implementations. This work advances practical quantum verification tools for NISQ devices, enabling higher-fidelity characterization of quantum processes under realistic noise conditions. |
| title | Error-mitigated entanglement-assisted quantum process tomography |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2502.10715 |