Optimal and robust experiment design for quantum state tomography of star-topology register
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2022
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| Acceso en línea: | |
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| _version_ | 1866929479782236160 |
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| author | Liu, Ran Hou, Yanjun Wu, Ze Zhou, Hui Chen, Jiahui Chen, Xi Li, Zhaokai Peng, Xinhua |
| author_facet | Liu, Ran Hou, Yanjun Wu, Ze Zhou, Hui Chen, Jiahui Chen, Xi Li, Zhaokai Peng, Xinhua |
| contents | While quantum state tomography plays a vital role in the verification and benchmarking of quantum systems, it is an intractable task if the controllability and measurement of quantum registers are constrained. In this paper, we study the quantum state tomography of star-topology registers, in which the individual addressability of peripheral spins is infeasible. Based on the star-symmetry, we decompose the Hilbert space to alleviate the complexity of tomography and design a compact strategy with minimum number of measurements. By optimizing the parameterized quantum circuit for information transfer, the robustness against measurement errors is also improved. Furthermore, we apply this method to a 10-spin star-topology register and demonstrate its ability to characterize large-scale systems. Our results can help future investigations of quantum systems with constrained ability of quantum control and measurement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2206_08581 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Optimal and robust experiment design for quantum state tomography of star-topology register Liu, Ran Hou, Yanjun Wu, Ze Zhou, Hui Chen, Jiahui Chen, Xi Li, Zhaokai Peng, Xinhua Quantum Physics While quantum state tomography plays a vital role in the verification and benchmarking of quantum systems, it is an intractable task if the controllability and measurement of quantum registers are constrained. In this paper, we study the quantum state tomography of star-topology registers, in which the individual addressability of peripheral spins is infeasible. Based on the star-symmetry, we decompose the Hilbert space to alleviate the complexity of tomography and design a compact strategy with minimum number of measurements. By optimizing the parameterized quantum circuit for information transfer, the robustness against measurement errors is also improved. Furthermore, we apply this method to a 10-spin star-topology register and demonstrate its ability to characterize large-scale systems. Our results can help future investigations of quantum systems with constrained ability of quantum control and measurement. |
| title | Optimal and robust experiment design for quantum state tomography of star-topology register |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2206.08581 |