Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.11180 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915390804721664 |
|---|---|
| author | Li, Jian Liu, Ye-Chao Chen, Xiao-Xiao Meng, Zhe Fan, Xing-Yan Wang, Wen-Hao Ma, Jie Zhang, An-Ning Shang, Jiangwei |
| author_facet | Li, Jian Liu, Ye-Chao Chen, Xiao-Xiao Meng, Zhe Fan, Xing-Yan Wang, Wen-Hao Ma, Jie Zhang, An-Ning Shang, Jiangwei |
| contents | Entanglement lies at the heart of quantum information science, serving as a key resource for quantum communication, computation, and metrology. Consequently, high-precision entangled state preparation and efficient verification are essential for practical quantum technologies. Quantum state verification (QSV) has recently gained much attention as an efficient and experiment-friendly approach for verifying entangled states. In this work, we experimentally demonstrate a QSV protocol for verifying three-qubit nonstabilizer $W$ state via a modified homogeneous strategy. Notably, our implementation extends QSV beyond its standard role by integrating the state preparation process, thus guiding and validating the real-time generation of high-fidelity target states. Specifically, we realize the efficient verification with a favorable scaling of the required number of copies versus infidelity as $-1.39$, outperforming the standard quantum limit of $-2$. Meanwhile, a fidelity of $97.07(\pm 0.26)\%$ via direct estimation is achieved using only $9$ measurement settings and $10^4$ samples, which is independently confirmed by quantum state tomography to be $98.58(\pm 0.12)\%$ with approximately $10^6$ measurements. This work presents the first experimental demonstration of QSV actively assisted with state preparation, establishing it as a powerful and resource-efficient alternative to full tomography for real-time quantum state engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11180 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Real-time preparation and verification of nonstabilizer states Li, Jian Liu, Ye-Chao Chen, Xiao-Xiao Meng, Zhe Fan, Xing-Yan Wang, Wen-Hao Ma, Jie Zhang, An-Ning Shang, Jiangwei Quantum Physics Entanglement lies at the heart of quantum information science, serving as a key resource for quantum communication, computation, and metrology. Consequently, high-precision entangled state preparation and efficient verification are essential for practical quantum technologies. Quantum state verification (QSV) has recently gained much attention as an efficient and experiment-friendly approach for verifying entangled states. In this work, we experimentally demonstrate a QSV protocol for verifying three-qubit nonstabilizer $W$ state via a modified homogeneous strategy. Notably, our implementation extends QSV beyond its standard role by integrating the state preparation process, thus guiding and validating the real-time generation of high-fidelity target states. Specifically, we realize the efficient verification with a favorable scaling of the required number of copies versus infidelity as $-1.39$, outperforming the standard quantum limit of $-2$. Meanwhile, a fidelity of $97.07(\pm 0.26)\%$ via direct estimation is achieved using only $9$ measurement settings and $10^4$ samples, which is independently confirmed by quantum state tomography to be $98.58(\pm 0.12)\%$ with approximately $10^6$ measurements. This work presents the first experimental demonstration of QSV actively assisted with state preparation, establishing it as a powerful and resource-efficient alternative to full tomography for real-time quantum state engineering. |
| title | Real-time preparation and verification of nonstabilizer states |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2507.11180 |