Experimental quantum teleportation and multiphoton entanglement via interfering narrowband photon sources

摘要

In this paper, we report a realization of synchronization-free quantum teleportation and narrowband threephoton entanglement through interfering narrowband photon sources. Since both the single-photon and the entangled photon pair utilized are completely autonomous, it removes the requirement of high-demanding synchronization techniques in long-distance quantum communication with pulsed spontaneous parametric downconversion sources. The frequency linewidth of the three-photon entanglement realized is on the order of several MHz, which matches the requirement of atomic ensemble based quantum memories. Such a narrow-band multiphoton source will have applications in some advanced quantum communication protocols and linear optical quantum computation.