[17p-414-1~14] 3.10 Optical quantum physics and technologies

[17p-414-1] [JSAP Young Scientist Award Speech] Long-distance distribution of high-dimensional time-bin entanglement

〇Takuya Ikuta¹, Hiroki Takesue¹ (1.NTT BRL)

Keywords:quantum entanglement, long-distance distribution, Time-bin state

Recently, photonic high-dimensional quantum states have been intensively investigated as a method to enlarge a Hilbert space for quantum information processing. We previously proposed and demonstrated a quantum state tomography (QST) for high-dimensional time-bin states. Here, we report the first experimental long-distance distribution of high-dimensional time-bin entangled photon pairs. By using the proposed QST, we confirmed that four-dimensional entanglement was preserved even after the photons were separated by 100 km of fiber.