Coherent spin-wave processor of stored optical pulses
Abstract
A device being a pinnacle of development of an optical quantum memory should combine the capabilities of storage, inter-communication and processing of stored information. In particular, the ability to capture a train of optical pulses, interfere them in an arbitrary way and finally perform on-demand release would in a loose sense realize an optical analogue of a Turing Machine. Here we demonstrate the operation of an optical quantum memory being able to store optical pulses in the form of collective spin-wave excitations in a multi-dimensional wavevector space. During storage, we perform complex beamsplitter operations and demonstrate a variety of protocol implemented as the processing stage, including interfering a pair of spin-wave modes with 95\% visibility. By engineering the phase-matching at the readout stage we realize the on-demand retrieval. The highly multimode structure of the presented quantum memory lends itself both to enhancing classical optical telecommunication as well as parallel processing of optical qubits at the single-photon level.
Cite
@article{arxiv.1808.00927,
title = {Coherent spin-wave processor of stored optical pulses},
author = {Mateusz Mazelanik and Michał Parniak and Adam Leszczyński and Michał Lipka and Wojciech Wasilewski},
journal= {arXiv preprint arXiv:1808.00927},
year = {2019}
}
Comments
11 pages, 7 figures