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COHEGRAPH SIGNED

Electron quantum optics in Graphene

Total Cost €

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EC-Contrib. €

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Partnership

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Project "COHEGRAPH" data sheet

The following table provides information about the project.

Coordinator
COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES 

Organization address
address: RUE LEBLANC 25
city: PARIS 15
postcode: 75015
website: www.cea.fr

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Total cost 1˙500˙000 €
 EC max contribution 1˙500˙000 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2015-STG
 Funding Scheme ERC-STG
 Starting year 2016
 Duration (year-month-day) from 2016-05-01   to  2021-04-30

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES FR (PARIS 15) coordinator 1˙500˙000.00

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 Project objective

Quantum computing is based on the manipulation of quantum bits (qubits) to enhance the efficiency of information processing. In solid-state systems, two approaches have been explored:

• static qubits, coupled to quantum buses used for manipulation and information transmission, • flying qubits which are mobile qubits propagating in quantum circuits for further manipulation.

Flying qubits research led to the recent emergence of the field of electron quantum optics, where electrons play the role of photons in quantum optic like experiments. This has recently led to the development of electronic quantum interferometry as well as single electron sources. As of yet, such experiments have only been successfully implemented in semi-conductor heterostructures cooled at extremely low temperatures. Realizing electron quantum optics experiments in graphene, an inexpensive material showing a high degree of quantum coherence even at moderately low temperatures, would be a strong evidence that quantum computing in graphene is within reach. One of the most elementary building blocks necessary to perform electron quantum optics experiments is the electron beam splitter, which is the electronic analog of a beam splitter for light. However, the usual scheme for electron beam splitters in semi-conductor heterostructures is not available in graphene because of its gapless band structure. I propose a breakthrough in this direction where pn junction plays the role of electron beam splitter. This will lead to the following achievements considered as important steps towards quantum computing:

• electronic Mach Zehnder interferometry used to study the quantum coherence properties of graphene, • two electrons Aharonov Bohm interferometry used to generate entangled states as an elementary quantum gate, • the implementation of on-demand electronic sources in the GHz range for graphene flying qubits.

 Publications

year authors and title journal last update
List of publications.
2015 N. Kumada, F. D. Parmentier, H. Hibino, D. C. Glattli, P. Roulleau
Shot noise generated by graphene p–n junctions in the quantum Hall effect regime
published pages: 8068, ISSN: 2041-1723, DOI: 10.1038/ncomms9068
Nature Communications 6 2019-06-19
2018 Qianfan Ma, François D. Parmentier, Preden Roulleau, Geneviève Fleury
Graphene n − p junctions in the quantum Hall regime: Numerical study of incoherent scattering effects
published pages: , ISSN: 2469-9950, DOI: 10.1103/physrevb.97.205445
Physical Review B 97/20 2019-05-27

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