[20p-A404-1~18] 3.9 光量子物理・技術（旧3.10）

▲ [20p-A404-13] Three-photon time-bin Greenberger-Horne-Zeilinger state generation

〇HsinPin Lo¹、Takuya Ikuta¹、Koji Azuma¹、Toshimori Honjo¹、William J. Munro¹、Hiroki Takesue¹ (1.NTT BRL)

キーワード：time-bin entanglement, multi-photon entanglement

We generate a three-photon time-bin entangled state using a 2x2 optical switch as a time-dependent beam splitter to entangle Bell states from a spontaneous parametric down-conversion source and weak coherent pulse. We performed quantum state tomography to reconstruct the density matrix of the three-photon time-bin GHZ state. The state fidelity is over 71%. We expect this technology can be used for multipartite quantum communications through long-distance optical fibers by using time-bin qubits.