[20p-A404-1~18] 3.9 Optical quantum physics and technologies (formerly 3.10)

△ [20p-A404-2] Measurement of Femtosecond Multimode Photon Echo from Quantum Dots with Up-conversion Single-photon Detector

〇(M2)Yuta Kochi^1,2, Yutaro Kinoshita^1,2, Sunao Kurimura³, Kouichi Akahane⁴, Junko Ishi-Hayase^1,2 (1.Keio Univ., 2.Keio CSPN, 3.NIMS, 4.NICT)

Keywords:nonlinear optics, quantum dot, quantum communication

In quantum technology using photons, the temporal multimode of qubits is important. However, the bandwidth of conventional quantum memories and the performance limitations of single-photon detectors limit the number of qubits that can be handled to ~ns. To solve these problems, our group has developed a multilayer quantum dot memory with a bandwidth of 10 THz and a single-photon detector with a femtosecond temporal resolution. In this presentation, we report on the storage and measurement of femtosecond temporal multimode signals using the combination of these devices.