Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory
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| Format: | Preprint |
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2025
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| author | Guo, Yu Banerji, Anindya Chin, Jia Boon Chowdhury, Arya Ling, Alexander |
| author_facet | Guo, Yu Banerji, Anindya Chin, Jia Boon Chowdhury, Arya Ling, Alexander |
| contents | We demonstrate a high-efficiency, free space optical delay line utilizing a nested multipass cell architecture. This design supports extended optical paths with low loss, aided by custom broadband dielectric coating that provides high reflectivity across a wide spectral bandwidth. The cell is characterized using polarization-entangled photon pairs, with signal photons routed through the delay line and idler photons used as timing reference. Quantum state tomography performed on the entangled pair reveals entanglement preservation with a fidelity of $99.6(9)\%$ following a single-transit delay of up to $687$~ns, accompanied by a photon retrieval efficiency of $95.390(5)%$. The delay is controllable and can be set between $1.8$~ns to $687$~ns in $\sim12.6$~ns increments. The longest delay and wide spectral bandwidth result in a time-bandwidth product of $3.87\times 10^7$. These results position this delay line as a strong candidate for all-optical quantum memories and synchronization modules for scalable quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02096 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory Guo, Yu Banerji, Anindya Chin, Jia Boon Chowdhury, Arya Ling, Alexander Quantum Physics Optics We demonstrate a high-efficiency, free space optical delay line utilizing a nested multipass cell architecture. This design supports extended optical paths with low loss, aided by custom broadband dielectric coating that provides high reflectivity across a wide spectral bandwidth. The cell is characterized using polarization-entangled photon pairs, with signal photons routed through the delay line and idler photons used as timing reference. Quantum state tomography performed on the entangled pair reveals entanglement preservation with a fidelity of $99.6(9)\%$ following a single-transit delay of up to $687$~ns, accompanied by a photon retrieval efficiency of $95.390(5)%$. The delay is controllable and can be set between $1.8$~ns to $687$~ns in $\sim12.6$~ns increments. The longest delay and wide spectral bandwidth result in a time-bandwidth product of $3.87\times 10^7$. These results position this delay line as a strong candidate for all-optical quantum memories and synchronization modules for scalable quantum networks. |
| title | Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2509.02096 |