Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.07127 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915539522158592 |
|---|---|
| author | Wang, Yaxin Zhou, Linxiang Feng, Tianfeng Nie, Hanlin Xia, Ying Xiao, Tianqi Li, Juntao Vedral, Vlatko Zhou, Xiaoqi |
| author_facet | Wang, Yaxin Zhou, Linxiang Feng, Tianfeng Nie, Hanlin Xia, Ying Xiao, Tianqi Li, Juntao Vedral, Vlatko Zhou, Xiaoqi |
| contents | A major challenge in quantum communication is addressing the negative effects of noise on channel capacity, especially for completely depolarizing channels, where information transmission is inherently impossible. The concept of indefinite causal order provides a promising solution by allowing control over the sequence in which channels are applied. We experimentally demonstrate the activation of quantum communication through completely depolarizing channels using a programmable silicon photonic quantum chip. By implementing configurations based on the superposition of cyclic orders, a form of indefinite causal order, we report the first experimental realization of genuine quantum information transmission across multiple concatenated completely depolarizing channels. Our results show that when four completely depolarizing channels are combined using the superposition of cyclic orders, the fidelity of the output state is $0.712 \pm 0.013$, significantly exceeding the classical threshold of 2/3. Our work establishes indefinite causal order as a powerful tool for overcoming noise-induced limitations in quantum communication, demonstrating its potential in high-noise environments and opening new possibilities for building robust quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_07127 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental demonstration of genuine quantum information transmission through completely depolarizing channels in a superposition of cyclic orders Wang, Yaxin Zhou, Linxiang Feng, Tianfeng Nie, Hanlin Xia, Ying Xiao, Tianqi Li, Juntao Vedral, Vlatko Zhou, Xiaoqi Quantum Physics A major challenge in quantum communication is addressing the negative effects of noise on channel capacity, especially for completely depolarizing channels, where information transmission is inherently impossible. The concept of indefinite causal order provides a promising solution by allowing control over the sequence in which channels are applied. We experimentally demonstrate the activation of quantum communication through completely depolarizing channels using a programmable silicon photonic quantum chip. By implementing configurations based on the superposition of cyclic orders, a form of indefinite causal order, we report the first experimental realization of genuine quantum information transmission across multiple concatenated completely depolarizing channels. Our results show that when four completely depolarizing channels are combined using the superposition of cyclic orders, the fidelity of the output state is $0.712 \pm 0.013$, significantly exceeding the classical threshold of 2/3. Our work establishes indefinite causal order as a powerful tool for overcoming noise-induced limitations in quantum communication, demonstrating its potential in high-noise environments and opening new possibilities for building robust quantum networks. |
| title | Experimental demonstration of genuine quantum information transmission through completely depolarizing channels in a superposition of cyclic orders |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2510.07127 |