Distribution of Time-Energy Entanglement over 100 km fiber using superconducting single-photon detectors
Qiang Zhang, Hiroki Takesue, Sae Woo Nam, Carsten Langrock, Xiuping, Xie, M. M. Fejer, Yoshihisa Yamamoto
TL;DR
This paper reports an experiment successfully distributing time-energy entangled photon pairs over 100 km of fiber using superconducting detectors, demonstrating potential for quantum communication applications.
Contribution
It presents the first experimental distribution of entangled photons over 100 km fiber with superconducting detectors, highlighting its feasibility for quantum networks.
Findings
Entanglement maintained over 100 km fiber
Superconducting detectors enable high detection efficiency
Photon pairs remain useful for quantum key distribution
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.
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