Entanglement swapping with quantum-memory-compatible photons
Jeongwan Jin, Marcel.li Grimau Puigibert, Lambert Giner, Joshua A. Slater, Michael R. E. Lamont, Varun Boehm Verma, Matthew D. Shaw, Francesco Marsili, Sae Woo Nam, Daniel Oblak, Wolfgang Tittel · Physical Review A · 2015
We report entanglement swapping with time-bin entangled photon pairs, each constituted of a 795-nm photon and a 1533-nm photon, that are created via spontaneous parametric down conversion in a nonlinear crystal. After projecting the two 1533-nm photons onto a Bell state, entanglement between the two 795-nm photons is verified by means of quantum state tomography. As an important feature, the wavelength and bandwidth of the 795-nm photons is compatible with ${\mathrm{Tm}:\mathrm{LiNbO}}_{3}$-based quantum memories, making our experiment an important step towards the realization of a quantum repeater.