SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 9: Photonic Quantum Technologies (joint session Q/QI)
QI 9.4: Vortrag
Dienstag, 7. März 2023, 11:45–12:00, A320
Room-temperature quantum memory: Interfacing atomic vapours and semiconductor quantum dots — •Esteban Gómez-López1, Quirin Buchinger2, Tobias Huber2, and Oliver Benson1 — 1Humboldt-Universität zu Berlin, 12489 Berlin — 2University of Würzburg, 97074 Würzburg
Quantum repeaters are a key element for scalable quantum networks, where quantum memories can substantially increase the efficiency of long-distance communications [1]. Quantum memories based on warm atomic ensembles constitute an attractive platform as they can store high-bandwidth photons [2] up to the second range [3]. Here we show an Electromagnetically Induced Transparency (EIT) quantum memory hosted in warm cesium vapour. Storage of faint coherent light pulses shows high readout efficiency. A measured bandwidth in the order of 200 MHz makes the memory compatible with the Fourier-limited emission of semiconductor Quantum Dots (QD) embedded in micropillar cavities [4]. We also present the first attempts to interface the emission from a QD-micropillar with our quantum memory by fine-tuning the emission wavelength of the emitters to the hyperfine transitions of the Cs D1 line, where the EIT memory takes place. This work sets the base for a hybrid quantum memory for single photons from a semiconductor single-photon source based on warm atomic ensembles. [1] P. van Loock et al., Adv. Quantum Technol. 3, 1900141 (2020). [2] N. Sangouard et al., Rev. Mod. Phys. 83, 33 (2011). [3] O. Katz and O. Firstenberg, Nat. Commun. 9, 2074 (2018). [4] H. Wang et al., Phys. Rev. Lett. 116, 213601 (2016).