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We have developed a quantum memory using quantum dots with a photon echo method for the storage of ultraweak femtosecond pulses. This quantum memory has a large bandwidth of 7.2 THz, which can be achieved due to the large inhomogeneous broadening of quantum dots. We successfully demonstrated femtosecond timebin pulse transfer to photon-echo-based quantum memory using quantum dots. We also succeeded in measuring the retrieved time-bin pulses as a photon echo from the quantum memory using a pulse-pumped frequency upconversion single-photon detector (UCSPD) with a temporal resolution of 429 fs. It is found that the retrieved time-bin photon echo pulse maintains the sub-picosecond time duration and the relative phase.
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Yuta Kochi, Yutaro Kinoshita, Sunao Kurimura, Kouichi Akahane, Junko Ishi-Hayase, "Femtosecond time-bin pulse transfer and retrieval on photon-echo-based quantum memory using quantum dots," Proc. SPIE 12430, Quantum Sensing and Nano Electronics and Photonics XIX, 1243014 (15 March 2023); https://doi.org/10.1117/12.2649556