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We demonstrate an ultrabright narrow-band two-photon source at the 1.5 -\mu mtelecom wavelength for long-distance quantum communication. By utilizing abow-tie cavity, we obtain a cavity enhancement factor of $4.06\times 10^4$. Ourmeasurement of the second-order correlation function $G^{(2)} ({\tau})$ revealsthat the linewidth of $2.4$ MHz has been hitherto unachieved in the 1.5 -\mu mtelecom band. This two-photon source is useful for obtaining a high absorptionprobability close to unity by quantum memories set inside quantum repeaternodes. Furthermore, to the best of our knowledge, the observed spectralbrightness of $3.94\times 10^5$ pairs/(s$\cdot$MHz$\cdot$mW) is also thehighest reported over all wavelengths.

Ultrabright narrow-band telecom two-photon source for long-distance quantum communication