High-dimensional quantum communication with scalable photonic entanglement in time and frequency
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Chang, Kai-Chi Sarihan, Murat Can Li, Nicky Kai Hong Kanitschar, Florian Akyuz, Kemal Enes Chen, Yujie Lee, Dong-Il Kang, Jin Ho Aldhafeeri, Alwaleed Mueller, Andrew Shaw, Matthew D. Korzh, Boris Spiropulu, Maria Erker, Paul Huber, Marcus Wong, Chee Wei |
| author_facet | Chang, Kai-Chi Sarihan, Murat Can Li, Nicky Kai Hong Kanitschar, Florian Akyuz, Kemal Enes Chen, Yujie Lee, Dong-Il Kang, Jin Ho Aldhafeeri, Alwaleed Mueller, Andrew Shaw, Matthew D. Korzh, Boris Spiropulu, Maria Erker, Paul Huber, Marcus Wong, Chee Wei |
| contents | High-dimensional photonic entanglement holds significant promise for advancing quantum communication, computation, and metrology. For example, large-alphabet quantum communication protocols are known to benefit from enhanced noise resilience and information capacity via multi-bit time-bin encoding. Yet, characterizing high-dimensional entangled states is challenging, as full state tomography becomes prohibitively costly and often requires unrealizable measurements. Here, we demonstrate a scan-free method to characterize high-dimensional entanglement in the time-frequency domain. Our reconstruction achieves a record $5.70\pm0.07$ ebits and a fidelity of $65.4\pm0.4\%$ with the maximally entangled state of local dimension $1021$, certifying the presence of $668$-dimensional entanglement. We further prove the attainability of a secure key rate of $15.6$ kB/s in a composable finite-size, entanglement-based protocol, and show that in continuous operation, the setup can quickly approach asymptotic key rates. Using commercial telecom components and state-of-the-art low-jitter single-photon detectors, our scalable architecture offers a practical path towards high-rate, noise-resilient quantum communication testbeds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_18212 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-dimensional quantum communication with scalable photonic entanglement in time and frequency Chang, Kai-Chi Sarihan, Murat Can Li, Nicky Kai Hong Kanitschar, Florian Akyuz, Kemal Enes Chen, Yujie Lee, Dong-Il Kang, Jin Ho Aldhafeeri, Alwaleed Mueller, Andrew Shaw, Matthew D. Korzh, Boris Spiropulu, Maria Erker, Paul Huber, Marcus Wong, Chee Wei Quantum Physics Optics High-dimensional photonic entanglement holds significant promise for advancing quantum communication, computation, and metrology. For example, large-alphabet quantum communication protocols are known to benefit from enhanced noise resilience and information capacity via multi-bit time-bin encoding. Yet, characterizing high-dimensional entangled states is challenging, as full state tomography becomes prohibitively costly and often requires unrealizable measurements. Here, we demonstrate a scan-free method to characterize high-dimensional entanglement in the time-frequency domain. Our reconstruction achieves a record $5.70\pm0.07$ ebits and a fidelity of $65.4\pm0.4\%$ with the maximally entangled state of local dimension $1021$, certifying the presence of $668$-dimensional entanglement. We further prove the attainability of a secure key rate of $15.6$ kB/s in a composable finite-size, entanglement-based protocol, and show that in continuous operation, the setup can quickly approach asymptotic key rates. Using commercial telecom components and state-of-the-art low-jitter single-photon detectors, our scalable architecture offers a practical path towards high-rate, noise-resilient quantum communication testbeds. |
| title | High-dimensional quantum communication with scalable photonic entanglement in time and frequency |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2603.18212 |