High fidelity entanglement swapping at telecommunication wavelength using single-photon detectors based on compound semiconductors

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Entanglement swapping experiment was carried out using spatially separated, polarization entangled photon sources at 1550 nm. In this experiment, we employed sinusoidally gated InGaAs/InP avalanche photodiodes which achieve high repetition frequencies and low dark counts. The high-performance single-photon detectors enable us to obtain ~ 0.9 of a fidelity of the entanglement swapping. The high-fidelity entanglement swapping will be able to be applied to the quantum key distribution over an optical fiber network.