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Updated: Jul 4, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Distribution of time-energy entanglement over 100 km fiber using superconducting single-photon detectors
Qiang Zhang1, Hiroki Takesue, Sae Woo Nam
1Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. qiangzh@stanford.edu
Abstract:
In this letter, we report an experimental realization of distributing entangled photon pairs over 100 km of dispersion-shifted fiber. In the experiment, we used a periodically poled lithium niobate waveguide to generate the time-energy entanglement and superconducting single-photon detectors to detect the photon pairs after 100 km. We also demonstrate that the distributed photon pairs can still be useful for quantum key distribution and other quantum communication tasks.

