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Type: Journal article
Title: Gradient echo quantum memory in warm atomic vapor
Author: Pinel, O.
Hosseini, M.
Sparkes, B.
Everett, J.
Higginbottom, D.
Campbell, G.
Lam, P.
Buchler, B.
Citation: Journal of Visualized Experiments, 2013; 2013(81):e50552-1-e50552-10
Publisher: MYJoVE Corporation
Issue Date: 2013
ISSN: 1940-087X
Statement of
Olivier Pinel, Mahdi Hosseini, Ben M. Sparkes, Jesse L. Everett, Daniel Higginbottom, Geoff T. Campbell, Ping Koy Lam, Ben C. Buchler
Abstract: Gradient echo memory (GEM) is a protocol for storing optical quantum states of light in atomic ensembles. The primary motivation for such a technology is that quantum key distribution (QKD), which uses Heisenberg uncertainty to guarantee security of cryptographic keys, is limited in transmission distance. The development of a quantum repeater is a possible path to extend QKD range, but a repeater will need a quantum memory. In our experiments we use a gas of rubidium 87 vapor that is contained in a warm gas cell. This makes the scheme particularly simple. It is also a highly versatile scheme that enables in-memory refinement of the stored state, such as frequency shifting and bandwidth manipulation. The basis of the GEM protocol is to absorb the light into an ensemble of atoms that has been prepared in a magnetic field gradient. The reversal of this gradient leads to rephasing of the atomic polarization and thus recall of the stored optical state. We will outline how we prepare the atoms and this gradient and also describe some of the pitfalls that need to be avoided, in particular four-wave mixing, which can give rise to optical gain.
Keywords: Physics; Issue 81; quantum memory; photon echo; rubidium vapor; gas cell; optical memory; gradient echo memory (GEM)
Description: Video Article -
Rights: Copyright © 2013 Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License
DOI: 10.3791/50552
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