Solid-state Raman quantum memory in whispering gallery mode resonators: signal-to-noise ratio

Alexander Berezhnoi,А А Калачев

doi:10.1051/epjconf/201716101004

Abstract

The possibility of implementation of optical quantum memory via off-resonant Raman absorption and emission of single-photon pulses in rare-earth-ion-doped crystals is theoretically analysed taking into account signal-to-noise ratio at the output of the memory device. The crystal 143 Nd 3+ :Y 7 LiF 4 is considered as an example. It is shown that the signal-to-noise ratio can exceed unity for single-photon input pulses provided that storage and retrieval of them is performed in the doped crystals forming a microcavity such as whispering gallery mode resonator.

Highlights

Quantum memories are of crucial importance for developing quantum information technologies and form a platform for building scalable linear optical quantum computers, realizing long-distance quantum communications, etc
Isotopically pure crystals are of particular interest. They can demonstrate very small inhomogeneous broadening of optical transitions, reaching tens of MHz, which proves to be smaller than the hyperfine splitting of the energy levels of impurity ions
These crystals are promising candidates for implementing memory protocols based on off-resonant Raman interaction [5,6,7]

Summary

Introduction

Quantum memories are of crucial importance for developing quantum information technologies and form a platform for building scalable linear optical quantum computers, realizing long-distance quantum communications, etc. (see [1, 2] for a recent review). Quantum memories are of crucial importance for developing quantum information technologies and form a platform for building scalable linear optical quantum computers, realizing long-distance quantum communications, etc. One of the most commonly discussed materials are rare-earth-ion-doped solids [3], in which the phase relaxation time at cryogenic temperatures may be as long as several hours [4].

Results

Conclusion