The University of Franche-Comté is a French university in the Academy of Besançon with five campuses: Besançon , Belfort , Montbéliard , Vesoul , and Lons-le-Saunier .It was founded in 1423 in Dole, at that time in the Duchy of Burgundy, and moved to Besançon in 1691 as Dole was being punished for having resisted too long against the king of France Louis XIV during its conquest of the region.The Centre for Applied Linguistics of the University of Franche-Comté ranks among the top language teaching institutions in the world. The CLA has research contacts in more than 110 countries, and partners with the French Ministry of Education and the Ministry of Foreign Affairs.The Centre of Distance Teaching allow to people who are working to continue to study in different matters like history, informatics, mathematics, AEG, ... The Centre received years ago many demands from students from Djibouti, and then collaborated at the creation of the University of Djibouti.Much of the international visibility in pure and applied science at the University of Franche-Comté comes through the CNRS FEMTO-ST with its expertise in numerous fields, including physics, optics, mechanics, time-frequency, microsystems and nanotechnology. Wikipedia.
Crini G.,University of Franche Comte
Chemical Reviews | Year: 2014
Cyclodextrins (CD) are synthetic substances obtained from the enzymatic degradation of one of the most essential polysaccharides, starch. CDs belong to the family of cage molecules; that is, the core of their structure is composed of a dimensionally stable hydrophobic cavity that can trap or encapsulate other molecules. Villiers concluded that the properties of these particular dextrins were very clearly different from those of the various saccharides known at the time. Nevertheless, he did not pursue research into CDs, preferring to focus on alkaloids. The major discovery of Schardinger was to isolate the microorganism able to synthesize the enzyme that catalyzes the degradation of starch into cyclodextrins. This was identified a few years later as cyclodextrin glucosyltransferase, which more exactly attacked amylose, the linear component of starch. It can be noted that even today the most frequently used source of enzyme for the production of CDs is Bacillus macerans.
Larger L.,University of Franche Comte
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2013
Nonlinear delay dynamics have found during the last 30 years a particularly prolific exploration area in the field of photonic systems. Besides the popular external cavity laser diode set-ups, we focus in this article on another experimental realization involving electro-optic (EO) feedback loops, with delay. This approach has strongly evolved with the important technological progress made on broadband photonic and optoelectronic devices dedicated to high-speed optical telecommunications. The complex dynamical systems performed by nonlinear delayed EO feedback loop architectures were designed and explored within a huge range of operating parameters. Thanks to the availability of high-performance photonic devices, these EO delay dynamics led also to many successful, efficient and diverse applications, beyond the many fundamental questions raised from the observation of experimental behaviours. Their chaotic motion allowed for a physical layer encryption method to secure optical data, with a demonstrated capability to operate at the typical speed of modern optical telecommunications. Microwave limit cycles generated in similar EO delay oscillators showed significantly improved spectral purity thanks to the use of a very long fibre delay line. Last but not least, a novel brain inspired computational principle has been recently implemented physically in photonics for the first time, again on the basis of an EO delay dynamical system. In this latter emerging application, the computed result is obtained by a proper 'read-out' of the complex nonlinear transients emerging from a fixed point, the transient being issued by the injection of the information signal to be processed. © 2013 The Author(s) Published by the Royal Society. All rights reserved.
Pouthier V.,University of Franche Comte
Physical Review B - Condensed Matter and Materials Physics | Year: 2011
The exciton-phonon system in a confined environment is revisited within standard perturbation theory. Special attention is paid to describing the time evolution of the excitonic coherences at finite temperature. To proceed, the system involving an exciton dressed by a single phonon mode is considered. Owing to its simplicity, it is solved exactly so that the relevance of the perturbation theory is checked. Within the nonadiabatic weak-coupling limit, it is shown that several time scales govern the coherence dynamics. In the short-time limit, the coherences behave as if the exciton was insensitive to the phonon bath. Then, quantum decoherence takes place. Finally the coherences recur almost periodically at specific revival times. Coherence decay and revival strongly depend on the nature of the excitonic states. In particular, for odd lattice sizes, the coherence of the state exactly located at the band center survives over a very long-time scale. Therefore, confinement-induced decoherence softening favors high-fidelity quantum-state transfer and allows to encode the information on a quantum bit almost insensitive to quantum decoherence. © 2011 American Physical Society.
Pouthier V.,University of Franche Comte
Physical Review B - Condensed Matter and Materials Physics | Year: 2012
A communication protocol is proposed in which quantum state transfer is mediated by a vibrational exciton. We consider two distant molecular groups grafted on the sides of a one-dimensional lattice. These groups behave as two quantum computers where the information in encoded and received. The lattice plays the role of a communication channel along which the exciton propagates and interacts with a phonon bath. Special attention is paid to describing the system involving an exciton dressed by a single phonon mode. The Hamiltonian is thus solved exactly so that the relevance of the perturbation theory is checked. Within the nonadiabatic weak-coupling limit, it is shown that the system supports three quasidegenerate states that define the relevant paths followed by the exciton to tunnel between the computers. When the model parameters are judiciously chosen, constructive interferences take place between these paths. Phonon-induced decoherence is minimized and a high-fidelity quantum state transfer occurs over a broad temperature range. © 2012 American Physical Society.
Dudley J.M.,University of Franche Comte |
Dias F.,University College Dublin |
Erkintalo M.,University of Auckland |
Genty G.,Tampere University of Technology
Nature Photonics | Year: 2014
Optical rogue waves are rare, extreme fluctuations in the value of an optical field. The term 'optical rogue wave' was first used in the context of an analogy between pulse propagation in an optical fibre and wave group propagation on deep water, but has since been generalized to describe many other processes in optics. This Review provides an overview of the field, concentrating primarily on propagation in optical fibre systems that exhibit nonlinear breather and soliton dynamics, but also discussing other optical systems in which extreme events have been reported. Although statistical features such as long-tailed probability distributions are often considered to be the defining feature of rogue waves, we emphasize the underlying physical processes that drive the appearance of extreme optical structures. © 2014 Macmillan Publishers Limited. All rights reserved.