MULTIMEM

Multiple approaches for multimode quantum memories

Coordinatore	UNIVERSITE DE GENEVE    more  Organization address address: Rue du General Dufour 24 city: GENEVE postcode: 1211 contact info Titolo: Prof. Nome: Nicolas Cognome: Gisin Email: send email Telefono: +41 22 379 65 95 Fax: +41 22 379 39 80
Nazionalità Coordinatore	Switzerland [CH]
Totale costo	245˙520 €
EC contributo	245˙520 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2011-IOF
Funding Scheme	MC-IOF
Anno di inizio	2013
Periodo (anno-mese-giorno)	2013-03-01   -   2015-10-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	UNIVERSITE DE GENEVE  Organization address address: Rue du General Dufour 24 city: GENEVE postcode: 1211 contact info Titolo: Prof. Nome: Nicolas Cognome: Gisin Email: send email Telefono: +41 22 379 65 95 Fax: +41 22 379 39 80	CH (GENEVE)	coordinator	245˙520.60

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 Obiettivo del progetto (Objective)

'Quantum communication aims to transmit a quantum state (e.g. entangled states) between two distant locations. Unfortunately, the losses during the transmission in optical fiber or in free space are detrimental to the entanglement and make direct practical implementation of long distances communication unrealistic.

In classical communication this problem can be solved using amplifiers but this approach is forbidden by quantum mechanics in most of the cases. However the concept of quantum repeaters offers the possibility to solve this problem based on the idea that entanglement over a given distance can be created by entanglement swapping starting from two entangled pairs, covering only half the distance. This method implies the ability to store a quantum state and thus requires the availability of long-lived quantum memory.

The long-term goal in the field is therefore to improve over the direct transmission rate using a quantum repeater approach. Indeed, quantum memories have been demonstrated in several materials using various protocols, but the practical implementation is still a far reaching goal.

During this project, I will study two very promising protocols : the gradient-echo-memory (outgoing phase) and the atomic-frequency-comb memory (returning phase) with three different materials : hot atomic vapor, cold atoms, rare-earth crystals. Time and space channels multiplexing are key features to improve over the direct transmission rate,therefore this project focuses on the temporal and spatial multimode behavior of these memories. During the outgoing phase, I will build a gradient-echo-memory to store quantum correlated images. This is expected to be the first demonstration of multispatial mode quantum memory. During the returning phase depending of the experimental progress of the Geneva's group, I will work on temporal multiplexing and practical implementation of a quantum repeater, which fits perfectly within the European project leaded by the group : QuRep.'