In this letter, we report a realization of synchronization-free quantumteleportation and narrowband three-photon entanglement through interferingnarrowband photon sources. Since both the single-photon and the entangledphoton pair utilized are completely autonomous, it removes the requirement ofhigh demanding synchronization technique in long-distance quantum communicationwith pulsed spontaneous parametric down-conversion sources. The frequencylinewidth of the three-photon entanglement realized is on the order of severalMHz, which matches the requirement of atomic ensemble based quantum memories.Such a narrowband multi-photon source will have applications in some advancedquantum communication protocols and linear optical quantum computation.
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