Efficient learning of mixed-state tomography for photonic quantum walk
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866915007441141760 |
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| author | Wang, Qin-Qin Dong, Shaojun Li, Xiao-Wei Xu, Xiao-Ye Wang, Chao Han, Shuai Yung, Man-Hong Han, Yong-Jian Li, Chuan-Feng Guo, Guang-Can |
| author_facet | Wang, Qin-Qin Dong, Shaojun Li, Xiao-Wei Xu, Xiao-Ye Wang, Chao Han, Shuai Yung, Man-Hong Han, Yong-Jian Li, Chuan-Feng Guo, Guang-Can |
| contents | Noise-enhanced applications in open quantum walk (QW) have recently seen a surge due to their ability to improve performance. However, verifying the success of open QW is challenging, as mixed-state tomography is a resource-intensive process, and implementing all required measurements is almost impossible due to various physical constraints. To address this challenge, we present a neural-network-based method for reconstructing mixed states with a high fidelity (~97.5%) while costing only 50% of the number of measurements typically required for open discrete-time QW in one dimension. Our method uses a neural density operator that models the system and environment, followed by a generalized natural gradient descent procedure that significantly speeds up the training process. Moreover, we introduce a compact interferometric measurement device, improving the scalability of our photonic QW setup that enables experimental learning of mixed states. Our results demonstrate that highly expressive neural networks can serve as powerful alternatives to traditional state tomography. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_03640 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Efficient learning of mixed-state tomography for photonic quantum walk Wang, Qin-Qin Dong, Shaojun Li, Xiao-Wei Xu, Xiao-Ye Wang, Chao Han, Shuai Yung, Man-Hong Han, Yong-Jian Li, Chuan-Feng Guo, Guang-Can Quantum Physics Optics Noise-enhanced applications in open quantum walk (QW) have recently seen a surge due to their ability to improve performance. However, verifying the success of open QW is challenging, as mixed-state tomography is a resource-intensive process, and implementing all required measurements is almost impossible due to various physical constraints. To address this challenge, we present a neural-network-based method for reconstructing mixed states with a high fidelity (~97.5%) while costing only 50% of the number of measurements typically required for open discrete-time QW in one dimension. Our method uses a neural density operator that models the system and environment, followed by a generalized natural gradient descent procedure that significantly speeds up the training process. Moreover, we introduce a compact interferometric measurement device, improving the scalability of our photonic QW setup that enables experimental learning of mixed states. Our results demonstrate that highly expressive neural networks can serve as powerful alternatives to traditional state tomography. |
| title | Efficient learning of mixed-state tomography for photonic quantum walk |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2411.03640 |