2025/07/20 by Hikaru Shimizu, Shimizu, Hikaru, Yoshimoto, Joe +8
Computer Science · Engineering · #FOS: Physical sciences #Optical Network Technologies #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2507.14836
openalex publication_date 2025/07/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Polarization entanglement is widely used in optical quantum information processing due to its compatibility with standard optical components. On the other hand, it is known that polarization entanglement is susceptible to the loss, more precisely, its transmission rate in a lossy channel is limited by the scaling of O(η), where η is a transmittance of the channel. Here, we experimentally demonstrate that this rate-loss scaling limit can be overcome by a relatively simple protocol. This is possible by integrating the idea of the polarizaion-photon-number hybrid entanglement and the single-click entanglement swapping. We demonstrate square root improvement of the rate-loss scaling from the conventional approaches and achieve the fidelity of 0.843 for the distributed polarization entangled photon pairs. This improvement in the rate-loss scaling is equivalent to that achieved by 1-hop quantum repeater node. Our result paves a way to build a near-future quantum network and its applications.