« juillet 2018 »
L M M J V S D
25 26 27 28 29 30 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31 1 2 3 4 5
 
Tous les évènements de Physique à venir

Tous les évènements de Biologie / Chimie à venir

Tous les évènements à venir

Les évènements relevant de la Physique et de la Biologie / Chimie sont représentés en turquoise

Superconducting Nanowire Single-Photon Detector : Physics and Applications

Mardi 24 novembre 2015 15:00 - Duree : 1 heure
Lieu : Salle "Remy Lemaire" K 223 (1er étage) bât. K de l’institut Néel/CNRS

Orateur : Gregory GOLTSMAN

The idea to detect infrared photons by current-carrying superconducting ultrathin films, mostly of NbN, has led us to interesting new physics. Absorption of a low-energy photon (infrared or visible) by such a film leads to a nonequilibrium state in which superconductivity is locally destroyed. If the film carries a supercurrent (i.e. a current at zero resistance) with a density of up to 107A/cm2 at a liquid He temperature, then a substantial voltage pulse will detected.

In my talk I will discuss the essential features of the working mechanisms offered for such devices in different parts of the electromagnetic spectrum. Superconducting nanowire single-photon detectors (SNSPDs) also show great technological importance. The first application of the NbN SNSPD was debugging silicon CMOS IC devices. The second interesting and important application was quantum cryptography which relies on single-photon communication and enables unconditional security. Besides superior detection performance over a broad optical bandwidth, SNSPDs are also compatible with integrated optical platforms. This is a crucial requirement for applications in emerging quantum-photonic technologies. By embedding SNSPDs in nanophotonic circuits we realize waveguide-integrated single-photon detectors which unite all desirable detector properties in a single device. Besides the application in classical optics, nanophotonic integrated circuits (NPICs) hold promise for a more exotic use. Employing only waveguide-based photonic devices, one can implement on-chip equivalents of free-space optical components, thus offering a new route towards scalable linear optical quantum computing. In this case NPICs are operated with single photons in contrast to the relatively high optical intensities used in classical telecommunication. However, for fully integrated quantum circuits, not only passive devices but also active ingredients such as single-photon sources and integrated single-photon detectors are required. A monolithic implementation of all building blocks of a quantum photonic circuit would then enable to overcome the stability and scalability limitations of bulk optic realizations. With recent advances in the technology of on-chip single-photon sources, all required elements for future quantum photonic networks can be monolithically fabricated with prospect for emerging applications in optical quantum computing.

Contact : clemens.winkelmann@neel.cnrs.fr

ATTENTION : en raison de la mise en application avancée du plan vigipirate, toutes les personnes qui ne possèdent pas de badge CNRS doivent nous signalerleur venue au plus tard 24 heures à l’avance, afin d’ajouter leur nom à la liste des personnes autorisées à entrer sur le site.

Discipline évènement : (Physique)
Entité organisatrice : (Fondation Nanosciences) -
Entité organisatrice : (LANEF)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Nanoélectronique Quantique)
Site de l'évènement : Polygone scientifique

Prévenir un ami par email

Télécharger dans mon agenda

Cafés sciences de Grenoble | UdPPC de Grenoble | Sauvons Le Climat | Cafe des sciences de Vizille
Accueil du site | Secretariat | Espace privé | Suivre la vie du site RSS 2.0 : Tous les evenements Suivre la vie du site RSS 2.0 : Evenements de Physique Suivre la vie du site RSS 2.0 : Evenements de Biologie & Chimie