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Solid state quantum memory for optical signal at the single-photon level
Russian version
Akhmedzhanov R. A. 1, Gushchin L. A. 1, Zelensky I. V. 1, Nizov V. A.1, Nizov N. A.1, Sobgaida D. A.1
1Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: rinat@ipfran.ru, levgushchin@ipfran.ru, zelensky@ipfran.ru, nizovva@ipfran.ru, nizovn@ipfran.ru, dsobgayda@ipfran.ru
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We implement solid state quantum memory for optical signal at the single-photon level based on atomic frequency comb protocol in an isotopically pure 143Nd3+ : Y7LiF4 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 ~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.
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