XXIX Symposium "Nanophysics and Nanoelectronics" in Nizhny Novgorod, March 10-14, 2025
Photonics

Solid state quantum memory for optical signal at the single-photon level

R. A. Akhmedzhanov, L. A. Gushchin, I. V. Zelensky, V. A. Nizov, N. A. Nizov, D. A. Sobgaida

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod

Abstract: We implement solid state quantum memory for optical signal at the single-photon level based on atomic frequency comb protocol in an isotopically pure $^{143}$Nd$^{3+}$ : Y$^7$LiF$_4$ crystal. Using weakened laser pulses with the average photon number of around 1 we demonstrate signal storage for 60 ns with an efficiency of 6.4% and a signal-to-noise ratio $\sim$3. We create single-photon source based on spontaneous parametric down-conversion spectrally matched with quantum memory, and demonstrate the storage of its signal.

Keywords: atomic frequency comb, spontaneous parametric down-conversion, heralded single-photon source.

Received: 21.04.2025
Revised: 21.04.2025
Accepted: 21.04.2025

DOI: 10.61011/JTF.2025.10.61337.65-25

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