ALIBART , Olivier

Long distance quantum communication relies on efficient single photon sources, whose wavelength has to be centered on 1550nm. This thesis reports the realization of a heralded single photon source (HSPS) based on a periodically poled lithium niobate (PPLN) waveguide. The HSPS relies on photon pairs generated by spontaneous parametric...

Cet article présente une vérification formelle par ProVerif de la proposition de l'ETSI (European Telecommunications Standards Institute) pour standardiser l'utilisation d'un protocole de distribution quantique de clé.

This article presents a formal verification by ProVerif of the ETSI proposal to standardize the use of a quantum key distribution protocol.

We theoretically and numerically study the difference frequency generation and the signal amplification bandwidth together with the pump wavelength acceptance for counterpropagating optical parametric amplifiers. It is shown that the specific advantage of those amplifiers is that the DFG and amplification bandwidth is much narrower than in a...

Periodically poled lithium niobate waveguides (PPLN/W) are nowadays considered to be one of the most useful toolboxes for quantum communication experiments. Thanks to the high optical confinement over longer lengths than in bulk configurations (a few cm in our case), such structures provide highly efficient non-linear interactions, both in...

We report on a guided wave heralded photon source based on the creation of non-degenerate photon pairs by spontaneous parametric down conversion in a Periodically Poled Lithium Niobate waveguide. Using the signal photon at 1310 nm as a trigger, a gated detection process permits announcing the arrival of single photons at 1550 nm at the output...

Periodically poled lithium niobate waveguides (PPLN/W) are nowadays considered to be one of the most useful toolboxes for quantum communication experiments. Thanks to the high optical confinement over longer lengths than in bulk configurations (a few cm in our case), such structures provide highly efficient non-linear interactions, both in...

During the last decade, quantum entanglement has paved the way out to of the lab modern applications such as quantum computation and communication. Today, small scale quantum networks exist already, but they are limited to a few 100 km distance, due to intrinsic fiber transmission losses and non perfect detectors. These networks are typically...

We present a narrowband source of polarization entangled photons dedicated to a large variety of long-distance quantum network applications.

La communication quantique vise la génération, la distribution et la manipulation cohérente de bits d'information quantique (qbits). Il convient notamment de construire des entités de stockage (mémoires quantiques) pouvant fonctionner aussi bien en régime d'absorption que d'émission de photons uniques. Nous présentons l'élaboration d'une...

L'émission de microlasers dans la région du seuil est caractérisée par des techniques de coïncidence quantique. Un mélange de composantes cohérentes et incohérentes est mis en évidence aux très faibles intensité de pompe.

We present a narrowband source of polarization entangled photons dedicated to a large variety of long-distance quantum network applications.

During the last decade, quantum entanglement has paved the way out to of the lab modern applications such as quantum computation and communication. Today, small scale quantum networks exist already, but they are limited to a few 100 km distance, due to intrinsic fiber transmission losses and non perfect detectors. These networks are typically...

La communication quantique vise la génération, la distribution et la manipulation cohérente de bits d'information quantique (qbits). Il convient notamment de construire des entités de stockage (mémoires quantiques) pouvant fonctionner aussi bien en régime d'absorption que d'émission de photons uniques. Nous présentons l'élaboration d'une...

Periodically poled lithium niobate waveguides (PPLN/W) are considered to be one of the most useful toolboxes for quantum communication experiments. Thanks to the high optical confinement over longer lengths than in bulk configurations (a few cm in our case), such structures provide highly efficient non-linear interactions, both in down- and...

Quantum information science (QIS) is a pioneering field of research at the interface of physics and information science. By harnessing the unique properties of quantum mechanics to code, transmit and process information (Qbit), QIS offers significant opportunities to revolutionise information processing and communication strategies. Of the...

Quantum information protocols tend to involve more and more entangled photon pairs, for enabling advanced quantum tasks. To compensate for the low success efficiency of these protocols, one can increase the repetition rate of the emitted pairs, up to current telecom standard (40 GHz). In this context, we propose a realization of ultra-fast...

We report on a two-photon interference experiment in a quantum relay configuration using two picosecond regime periodically poled lithium niobate (PPLN) waveguide based sources emitting paired photons at 1550 nm. The results show that the picosecond regime associated with a guided-wave scheme should have important repercussions for quantum...

We report a telecom teleportation experiment involving narrowband entangled photons and faint laser pulses. This opens the route towards hybrid quantum nodes combining cold-atom single photon sources and entanglement-based quantum relays.

We report a realization of ultra-fast photon pair sources, specif- ically designed for efficient, long-distance, quantum relay operation. As a viable solution, our sources are capable to deliver high quality single photon pairs at high repetition rate, guaranteeing efficient operational condition for intended protocol.

We present the first experimental demonstration of the optical Sagnac effect at the single-photon level. Using a high quality guided-wave heralded single- photon source at 1550 nm and a fibre optics setup, we obtain an interference pattern with net visibilities up to (99.2 ± 0.4%). On the basis of this high visibility and the compactness of the...

Quantum information protocols tend to involve more and more entangled photon pairs, for enabling advanced quantum tasks. To compensate for the low success efficiency of these protocols, one can increase the repetition rate of the emitted pairs, up to current telecom standard (40 GHz). In this context, we propose a realization of ultra-fast...

We report on a two-photon interference experiment in a quantum relay configuration using two picosecond regime PPLN waveguide based sources emitting paired photons at 1550 nm. The results show that the picosecond regime associated with a guided-wave scheme should have important repercussions for quantum relay implementations in real conditions,...