Implementation of a Quantum Memory Protocol Based on the Revival of Silenced Echo in Orthogonal Geometry at the Telecommunication Wavelength

An optical quantum memory protocol has been implemented on the basis of the revival of silenced echo at the telecommunication wavelength for signal light fields with a small number of photons. To this end, a long-lived (>1 s) absorption line has been initialized and the orthogonal geometry of the propagation of the signal and rephasing fields has been chosen. An efficiency of revival of (17 +/- 1)% has been reached for the orthogonal polarization components of a signal pulse at a storage time of 60 mu s. The input pulse contains similar to 38 photons on average, the revived echo signal includes similar to 6 photons, and the signal-to-noise ratio is 1.3.

Automated summary

An optical quantum memory protocol has been implemented to revive silenced echo at the telecommunication wavelength for signal light fields with a small number of photons. A long-lived (>1 s) absorption line has been initialized and an orthogonal geometry for the propagation of the signal and rephasing fields has been chosen. The efficiency of revival reached (17 +/- 1)% for the orthogonal polarization components of the signal pulse at a storage time of 60 μs. The input pulse contains an average of about 38 photons, the revived echo signal includes about 6 photons, and the signal-to-noise ratio is 1.3.