Room-temperature ladder-type optical memory compatible with single photons from InGaAs quantum dots

• URL: http://arxiv.org/abs/2402.14686v2
• Date: Tue, 19 Nov 2024 09:52:50 GMT
• Title: Room-temperature ladder-type optical memory compatible with single photons from InGaAs quantum dots
• Authors: Benjamin Maaß, Norman Vincenz Ewald, Avijit Barua, Stephan Reitzenstein, Janik Wolters,
• Abstract summary: We experimentally realize a room-temperature ladder-type atomic vapor memory that operates on the Cs D1 line. The memory achieves a maximum internal storage efficiency of $eta_textint=15(1)%$. These results provide clear prospects for the development of a heterogeneous on-demand quantum light interface.
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• Abstract: On-demand storage and retrieval of quantum information in coherent light-matter interfaces is a key requirement for future quantum networking and quantum communication applications. Alkali vapor memories offer scalable and robust high-bandwidth storage at high repetition rates which makes them a natural fit to interface with solid-state single-photon sources. Here, we experimentally realize a room-temperature ladder-type atomic vapor memory that operates on the Cs D1 line. We provide a detailed experimental characterization and demonstration of on-demand storage and retrieval of weak coherent laser pulses with 0.06 photons per pulse at a high signal-to-noise ratio of SNR$=830(80)$. The memory achieves a maximum internal storage efficiency of $\eta_{\text{int}}=15(1)\%$ and an estimated $1/e$-storage time of $\tau_{\mathrm{s}}\approx32\,$ns. Benchmark properties for the storage of single photons from inhomogeneously broadened state-of-the-art solid-state emitters are estimated from the performance of the memory. Together with the immediate availability of high-quality InGaAs quantum dots emitting at 895\,nm, these results provide clear prospects for the development of a heterogeneous on-demand quantum light interface.

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