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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.03701 |
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| _version_ | 1866911529832546304 |
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| author | Reaz, Kazi Hassan, Md Mehdi Humberd, Jacob E. Boone, Matthew L. Estrada, Angel Fraire Mukherjee, Rick Sadeghpour, H. R. Agarwal, Girish S. Siopsis, George Li, Tian |
| author_facet | Reaz, Kazi Hassan, Md Mehdi Humberd, Jacob E. Boone, Matthew L. Estrada, Angel Fraire Mukherjee, Rick Sadeghpour, H. R. Agarwal, Girish S. Siopsis, George Li, Tian |
| contents | Advanced quantum networking protocols beyond bi-photon, point-to-point links rely critically on the ability to perform multi-photon interference across multiple nodes under realistic operating conditions. Yet experimental validation of such higher-order, multi-node interference effects in deployed metropolitan fiber networks remains limited. Here, we report a field demonstration of polarization-controlled reconfigurable four-photon interference over three distant nodes on a deployed metropolitan fiber network. Using a fully fiber-coupled linear-optical platform, we observe a fusion-type four-photon interference signature in presence of real-world impairments, including photon loss, polarization drift, and timing uncertainty. By performing polarization-resolved measurements on two locally retained photons, we conditionally select distinct two-photon coincidence channels that exhibit Bell-like and N00N-like behavior. Rather than pursuing multi-partite entanglement verification, this work focuses on establishing the technical feasibility of multi-photon, multi-node interference and reconfigurable conditional state preparation in the field in a deployed fiber network environment. These results serve as a systems-level validation toward future multi-photon, multi-node quantum networking architectures that require robust interference performance outside the laboratory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03701 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reconfigurable Four-Photon Interference among Three Nodes on a Field Deployed Metropolitan Fiber Network Reaz, Kazi Hassan, Md Mehdi Humberd, Jacob E. Boone, Matthew L. Estrada, Angel Fraire Mukherjee, Rick Sadeghpour, H. R. Agarwal, Girish S. Siopsis, George Li, Tian Quantum Physics Advanced quantum networking protocols beyond bi-photon, point-to-point links rely critically on the ability to perform multi-photon interference across multiple nodes under realistic operating conditions. Yet experimental validation of such higher-order, multi-node interference effects in deployed metropolitan fiber networks remains limited. Here, we report a field demonstration of polarization-controlled reconfigurable four-photon interference over three distant nodes on a deployed metropolitan fiber network. Using a fully fiber-coupled linear-optical platform, we observe a fusion-type four-photon interference signature in presence of real-world impairments, including photon loss, polarization drift, and timing uncertainty. By performing polarization-resolved measurements on two locally retained photons, we conditionally select distinct two-photon coincidence channels that exhibit Bell-like and N00N-like behavior. Rather than pursuing multi-partite entanglement verification, this work focuses on establishing the technical feasibility of multi-photon, multi-node interference and reconfigurable conditional state preparation in the field in a deployed fiber network environment. These results serve as a systems-level validation toward future multi-photon, multi-node quantum networking architectures that require robust interference performance outside the laboratory. |
| title | Reconfigurable Four-Photon Interference among Three Nodes on a Field Deployed Metropolitan Fiber Network |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2509.03701 |