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Probing quantum fluctuations of single electronic channels in model interacting systems

Total Cost €


EC-Contrib. €






 NSECPROBE project word cloud

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

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Project "NSECPROBE" data sheet

The following table provides information about the project.


Organization address
address: RUE LEBLANC 25
city: PARIS 15
postcode: 75015

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-2014-STG
 Funding Scheme ERC-STG
 Starting year 2015
 Duration (year-month-day) from 2015-05-01   to  2021-04-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

The fluctuation-dissipation theorem is a prominent milestone in Physics: It links the dissipative response of a physical system to its fluctuations, and provides a microscopic understanding of macroscopic irreversibility. Recent theoretical advances that have generalized the original fluctuation-dissipation theorem to non-linear quantum systems even far from equilibrium, ask for an experimental test, which is the aim of the project. We will measure the current fluctuations and dissipative response of driven quantum systems whose non-linearity arises from strong interactions. We will exploit the flexibility offered by nano-patterned high purity 2D electron gases in order to realize single electron channels in different regimes: 1/ interacting strongly with a single electromagnetic mode (Dynamical Coulomb Blockade of a quantum point contact), 2/ interacting with a single magnetic impurity (Kondo effect in quantum dots), 3/ driving the 2D gas in the fractional quantum Hall effect where current is carried by strongly correlated 1D channels prototypical of Luttinger liquids. Last, we will address a fundamental issue raised in the early days of quantum mechanics: how long does it take for a particle to cross a classically forbidden barrier? While Wigner-Smith’s theorem links the issue to the density fluctuations within the barrier, the fluctuation-dissipation theorem links it further to a quantum relaxation resistance. A full investigation of fluctuation-dissipation relations including quantum effects requires measurements at frequencies hf>k_BT. With the available dilution refrigeration techniques it implies measuring in the few GHz range. Since quantum conductors have an impedance h/e^2~25.8 kohm much larger than the 50ohm impedance of microwave components, new microwave methods able to deal with large impedance values will be developed. They will be based on the extension to finite magnetic field of the wide-band impedance matching methods recently developed by the PI.


year authors and title journal last update
List of publications.
2017 C. Mora, C. Altimiras, P. Joyez, F. Portier
Quantum properties of the radiation emitted by a conductor in the Coulomb blockade regime
published pages: 125311-1 to 1253, ISSN: 2469-9950, DOI: 10.1103/physrevb.95.125311
Physical Review B 95/12 2020-03-11
2016 C. Altimiras, F. Portier, P. Joyez
Interacting Electrodynamics of Short Coherent Conductors in Quantum Circuits
published pages: , ISSN: 2160-3308, DOI: 10.1103/PhysRevX.6.031002
Physical Review X 6/3 2020-03-11
2019 Udson C. Mendes, Sébastien Jezouin, Philippe Joyez, Bertrand Reulet, Alexandre Blais, Fabien Portier, Christophe Mora, Carles Altimiras
Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction
published pages: , ISSN: 2331-7019, DOI: 10.1103/physrevapplied.11.034035
Physical Review Applied 11/3 2020-03-11

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