Skip to Main content Skip to Navigation
Theses

Réalisation expérimentale d'une source de photons uniques par fluorescence de centres colorés individuels dans le diamant ; application à la cryptographie quantique

Alexios Beveratos 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Secure key distribution between two persons is a complicated task. In a classical world, it is impossible to guarantee that an eavesdropper doesn't create a copy of the key during the exchange. In 1984 has been proposed a protocol based on the properties of quantum mechanics that assures an unconditionally secure exchange of secret keys. Ideally, the protocol uses single photon sources, the information being coded on the polarisation of the photons. The security is guaranteed by choosing randomly the polarisation base (Linear, Circular). In this context, this work describes the realisation of a single photon source, and it's application to quantum cryptography. A single photon source is obtained by pulsed excitation of a single dipole. The dipole studied in this work is the NV center in diamond. It is composed of a Nitrogen atom (N) and a Vacancy (V) substituting two carbon atoms. Under continuous excitation the center has been studied with a confocal microscope and an intensity autocorrelation set-up. It has turned out to be a very good candidate for a single photon source since it is easy to manipulate and photostable. Under pulsed excitation, we show that this single photon source has high production efficiency, and a very low number of two-photon pulses. Finally, this source has been used in a quantum cryptography prototype. After a description of the experimental set-ups of the emitter and the receiver, we describe in detail a quantum key exchange. The achieved performances show a quantitative advantage in the maximum tolerated losses, compared to prototypes using faint laser pulses.
Complete list of metadatas

Cited literature [112 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-00008487
Contributor : Alexios Beveratos <>
Submitted on : Monday, February 14, 2005 - 4:18:00 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:32 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:11:13 PM

Identifiers

  • HAL Id : tel-00008487, version 1

Collections

Citation

Alexios Beveratos. Réalisation expérimentale d'une source de photons uniques par fluorescence de centres colorés individuels dans le diamant ; application à la cryptographie quantique. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2002. Français. ⟨tel-00008487⟩

Share

Metrics

Record views

1500

Files downloads

3663