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Quantum repeaters are required for long-distance quantum communication. Forefficient coupling of quantum entangled photon sources with narrow-linewidthquantum memories we performed the frequency stabilization of two lasers at 1514and 1010 nm. The 1514 nm pump laser of the entangled photon source exhibited afrequency stability of 3.6 \times 10^{-12} (\tau = 1 s). The 1010 nm pump laserof the wavelength conversion system exhibited a frequency stability of 3.4\times 10^{-12} (\tau = 1 s). The stabilities of both lasers were approximatelytwo orders of magnitude smaller than the frequency width of 4 MHz of the Pr:YSOquantum memory. Such frequency-stabilized lasers can realize the remotecoupling of a quantum memory and an entangled photon source in quantumrepeaters.

Offset-locking-based frequency stabilization of external cavity diode lasers for long-distance quantum communication