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COHEGRAPH SIGNED

Electron quantum optics in Graphene

Total Cost €

EC-Contrib. €

Partnership

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Outcomes and
results

COHEGRAPH project word cloud

Explore the words cloud of the COHEGRAPH project. It provides you a very rough idea of what is the project "COHEGRAPH" about.

building gapless zehnder semi quantum demand scheme propagating electron mobile single blocks efficiency optic buses interferometry realizing splitters qubits temperatures analog sources breakthrough direction computing conductor play band generate extremely coupled bohm elementary circuits moderately photons emergence graphene solid mach experiments ghz manipulation bits beam coherence static plays electrons material light optics transmission aharonov degree splitter inexpensive pn successfully gate showing achievements usual led heterostructures explored cooled flying entangled structure electronic junction perform

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 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.	FR (PARIS 15)	coordinator	1˙500˙000.00

Map

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

List of publications.
year	authors and title	journal	last update
2015	N. Kumada, F. D. Parmentier, H. Hibino, D. C. Glattli, P. Roulleau Shot noise generated by graphene pâ€“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, FranÃ§ois D. Parmentier, Preden Roulleau, GeneviÃ¨ve Fleury Graphene n âˆ’ 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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