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Optical memory in an erbium doped crystal : efficiency, bandwidth and noise studies for quantum memory applications

Abstract : Quantum information processing has been developing rapidly in the last two decades as a way to overcome the limitations of classical electronics. Several components to generate, process and send quantum information are needed. In this context, optical quantum memories appear as principal components to communicate quantum information at long distances by overcoming the losses of the optical fibers in the so-called quantum repeater scheme. During the last decade several storage protocols to store quantum information have been proposed and tested. In this thesis, I present the Revival of Silenced Echo (ROSE) protocol implemented in an Er3+:Y2SiO5 crystal. This material is a good candidate for a quantum memory because of its transition in the C-band of the telecom wavelengths where the losses in optical fibers are minimized. In this work, I evaluate the ROSE performances with weak classical pulses. I measure efficiency, bandwidth and storage time which are the typical figures of merit for an optical quantum memory. Starting with a fixed bandwidth, I demonstrate experimentally a good efficiency. Additionally, I measure the bandwidth dependence of the protocol. For this latter, the dipole-dipole interactions between erbium ions appears as limiting factors. Finally, I implement the ROSE protocol with a few photons per pulse to show its potential as a quantum memory. I report good efficiencies with a moderate signal to noise ratio.I finish this work with a series of measurements in new materials (doped or codoped with erbium), to extend the processing bandwidth of Er doped samples compatible the telecom wavelength range.
Keywords : Memory Quantum Optics
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Submitted on : Thursday, January 7, 2016 - 10:42:22 AM
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  • HAL Id : tel-01252046, version 1


Julian Dajczgewand. Optical memory in an erbium doped crystal : efficiency, bandwidth and noise studies for quantum memory applications. Quantum Physics [quant-ph]. Université Paris Saclay (COmUE), 2015. English. ⟨NNT : 2015SACLS198⟩. ⟨tel-01252046⟩



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