KAISER , Florian

The aim of this thesis is to develop sources of photonic entanglement to study both quantum networking tasks and some of the foundations of quantum physics. To this end, three high-performance sources are developed, each of them taking extensively advantage of standard telecom fibre optics components. The first source generates polarization...

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 the realization of a fiber-coupled time-bin entangled photon-pair source at 1538 nm. Unlike previous time-bin sources based on type-0 spontaneous parametric down conversion, our approach takes advantage of cross-polarized paired photons generated in a type-II periodically poled lithium niobate waveguide (PPLN/W). Here, we use a...

We report the realization of a fiber-coupled time-bin entangled photon-pair source at 1538 nm. Unlike previous time-bin sources based on type-0 spontaneous parametric down conversion, our approach takes advantage of cross-polarized paired photons generated in a type-II periodically poled lithium niobate waveguide (PPLN/W). Here, we use a...

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...

Quantum optical metrology enables phase sensitive measurements with a resolution beyond the classical Heisenberg limit. Here, we demonstrate a novel quantum metrology scheme for entanglement-enhanced chromatic dispersion (CD) measurements in short fibres and samples. Besides the expected doubled phase sensitivity, exploiting energy-time and...

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...

International audience

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...

Squeezed light is a fundamental resource for quantum communication. In view of its real-world applications, the realization of easy-to-operate experimental systems compatible with existing fiber networks is a crucial step. To comply with these requirements, we demonstrate the feasibility of a squeezing experiment at a telecom wavelength...

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...

Bohr's complementarity notion is at the heart of quantum physics, and suggests that in a quantum experiment, the observed phenomena are inherently linked to the type of measurement that is performed. For example, sending single photons to an open or closed Mach-Zehnder interferometer leads to the observation of particle or wave behaviours. In...

Bohr's complementarity notion is at the heart of quantum physics, and suggests that in a quantum experiment, the observed phenomena are inherently linked to the type of measurement that is performed. For example, sending single photons to an open or closed Mach-Zehnder interferometer leads to the observation of particle or wave behaviours. In...

We demonstrate an entanglement-enabled delayed-choice experiment making possible to observe a continuous morphing for single photon behaviours from wave-like to paticle-like.

We present a quantum delayed-choice experiment enabled by entanglement which permits observing a continuous morphing of single photons behaviours from wave-like to particle-like.

We show an entanglement-enabled delayed-choice experiment making possible to observe a continuous morphing for single photon behaviours from wave-like to paticle-like.

La dualité onde/particule se teste la plupart du temps à l'aide de photons uniques envoyés dans un interféromètre de Mach-Zehnder équilibré. On peut alors observer des comportements considérés comme mutuellement exclusifs, à savoir ondulatoire (présence d'interférences) ou corpusculaire (absence d'interférences) selon la présence ou l'absence...

La dualité onde/particule se teste la plupart du temps à l'aide de photons uniques envoyés dans un interféromètre de Mach-Zehnder équilibré. On peut alors observer des comportements considérés comme mutuellement exclusifs, à savoir ondulatoire (présence d'interférences) ou corpusculaire (absence d'interférences) selon la présence ou l'absence...

We report a quantum delayed-choice experiment based on entanglement, enabling to continuously morph single photons behavior from wave-like to particle-like, illustrating the inadequacy of a naive wave or particle description of light.

We present a quantum delayed-choice experiment enabled by entanglement which permits observing a continuous morphing of single photons behaviours from wave-like to particle-like.

We show an entanglement-enabled delayed-choice experiment making possible to observe a continuous morphing for single photon behaviours from wave-like to paticle-like.

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...