Literatura académica sobre el tema "Source de photons uniques accordable"
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Artículos de revistas sobre el tema "Source de photons uniques accordable"
Lounis, B., Ch Brunel, Ph Tamarat y M. Orrit. "Une source déclenchée de photons uniques basée sur le contrôle de la fluorescence de molécules individuelles". Le Journal de Physique IV 10, PR8 (mayo de 2000): Pr8–13. http://dx.doi.org/10.1051/jp4:2000802.
Texto completoOsłowska, Iwona. "THE ARCHITECTURE OF CONTEMPORARY POLISH LIBRARIES SELECTED PROJECTS". Przegląd Biblioteczny 89, Special (29 de julio de 2022): 32–87. http://dx.doi.org/10.36702/pb.886.
Texto completoTesis sobre el tema "Source de photons uniques accordable"
Finazzer, Matteo. "Boîtes quantiques accordées par contrainte mécanique et nanostructures photoniqueslarge bande pour le traitement quantique de l'information". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALY014.
Texto completoBright and tunable sources of indistinguishable single photons are key devices for photonic quantum information technologies. Building such a source with a semiconductor quantum dot (QD) requires a “knob” to tune the QD emission wavelength combined with a broadband photonic structure for light extraction. This thesis reports several important steps towards this goal.We first investigate a nanocylinder cavity, a photonic structure that, despites its simplicity, offers a pronounced Purcell acceleration of spontaneous emission over a large spectral bandwidth. We demonstrate the first resonant optical spectroscopy of a QD embedded in a nanopost cavity, by leveraging a cross-polarization scheme that efficiently suppresses stray laser light (collaboration with the group of Richard Warburton). This technique enabled a precise characterization of the optical properties of the emitter.We next demonstrate a tunable single-photon source based on a QD embedded in a tapered photonic wire. In our device, a set of on chip electrodes biased with a DC voltage applies an electrostatic force to the wire. As the wire bends, the resulting mechanical strain changes the bandgap energy of the embedded QDs. We demonstrate both a large increase and a large decrease of the QD emission wavelength by controlling the wire bending direction.With an AC voltage, the above-mentioned actuation scheme can also excite the vibration modes of the nanowire. This capability is interesting in the context of hybrid nanomechanics. In our experiments, we leverage the QD photoluminescence to detect and identify the wire mechanical vibrations. In particular, we evidence a high-order flexural mode that resonates at 190 MHz, a value that exceeds the QD radiative rate. This constitutes an important step towards the spectrally-resolved-sidebands regime.The devices demonstrated in this work open promising prospects for the future developments of quantum photonics and hybrid nanomechanics
Gaignard, Maxime. "Une source efficace de photons uniques et indiscernables". Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALY089.
Texto completoIn the fields of quantum communications and quantum computing, the transmission of information using single photons guarantees the security of the communication and enables calculations that would be impossible with our "classical" computers. One of the key elements in implementing such protocols is the photon source. It must emit, on demand, one and only one photon with specific quantum properties.The aim of this project is to characterise a source of single and indistinguishable photons, designed and manufactured at CEA-Grenoble, and consisting of an indium arsenide (InAs) semiconductor quantum dot integrated into a gallium arsenide (GaAs) nanocavity. With its low quality factor, the nanocavity enables photons to be extracted efficiently over a wide range of wavelengths (30nm). In addition, thanks to its small mode volume, the spontaneous emission of quantum dots within it can be accelerated by Purcell effect (Purcell factor up to 6).In this manuscript, we first detail the implementation and the optimisation of the experimental setups used to characterise the photons emitted by our sample : microphotoluminescence, radiative lifetime measurement, Hanbury-Brown and Twiss (HBT) experiment and Hong-Ou-Mandel (HOM) experiment. Then, we present the experimental results obtained for photons emitted by two distinct quantum dots : One containing neutral exciton states, and the second, containing a charged exciton state. In order to photo-create these exciton states in the quantum dots, two pulsed optical excitation schemes were implemented: the two-photon resonant excitation of the neutral biexciton, and the phonon-assisted quasi-resonant excitation of the neutral and charged excitons. We present the measurement of the three figures of merit of a single photon source for these two quantum dots : the brightness, the single-photon purity and the indistinguishability of the emitted photons. In a second phase, we will focus on the charged exciton state and measure the profile of its emission line and its autocorrelation function under continuous resonant excitation. These results, achieved within the nano-photonics group of the University of Basel, constitute the first demonstration of continuous excitation on these nanostructures, which is a good surprise given their small size.Finally, we will look at the effects of the application of mechanical stress on the energy separation of the two neutral exciton states, known as the "fine structure splitting" (FSS). During the radiative cascade of the neutral biexciton state, the two photons emitted are entangled in polarisation, and the fidelity of the entanglement depends in particular on the FSS. Here, we will consider a second sample, where the InAs quantum dots are embedded in a GaAs photonic nanowire. By bending the nanowire, mechanical stresses are applied to the quantum dots, which will modify the energy of the exciton states. We will present an experimental study aimed at observing a possible effect on the fine structure splitting.In conclusion, we have developed and optimised various experimental setups for characterising photon sources for applications in the fields of quantum communications and quantum computing. For a first version of these photonic nanostructures, the brightness, the single-photon purity and the indistinguishability of the photons emitted by our quantum dots integrated into nanocavities are very encouraging for the future. The next objectives are to improve the nanocavities and to characterise the decoherence phenomena and the mechanical coupling between the quantum dots and these nanostructures
Cremel, Thibault. "Vers une source de photons uniques opérationnelle à base de nanofils semiconducteurs". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY064/document.
Texto completoThe recent development of the quantum information theory focuses the interest of the scientific community on single-photon sources. Indeed, these sources can be used for instance for optical quantum computing or quantum cryptography to improve the quantum key distribution performances and avoid eavesdropping. Consequently, it is necessary to have reliable single-photon sources and for realistic applications, the challenge is to get a single-photon source operating up to room temperature.Our group recently demonstrated that by inserting a quantum dot of CdSe in a nanowire of ZnSe, single-photon emission could be obtained up to room temperature. Still, these nanowires had a low quantum yield and were not vertically oriented on the as-grown sample since they were grown along the (001) crystallographic orientation. The interest of vertically oriented nanowires is that they can be coupled to photonic structures to increase their photons collection and their growth is favored on (111)-oriented substrates.In this context, the aim of this PhD work is to develop the growth of vertically oriented ZnSe-CdSe nanowire quantum dots along the (111) crystallographic orientation by molecular beam epitaxy, to study their luminescence up to room temperature for single-photon sources applications, and to couple these nano-objects to photonic structures to increase the photons collection. To reach this goal, we divided this project in three steps.The first step focuses on the development of vertically oriented ZnSe nanowires, passivated with a semiconductor shell of ZnMgSe to enhance their luminescence. In a second step, we demonstrate the possibility to insert CdSe quantum dots in these ZnSe nanowires, using different growth conditions for the quantum dot. The influence of these growth conditions is studied with structural and composition analysis of these nano-objects. Optical studies as a function of the temperature show that these nanowires emit up to room temperature. Moreover, decay-time studies on single nanowire quantum dots reveal that these nanowires are robust and insensitive to non-radiative recombination channels up to 200 K. The third step of this work concerns the enhancement of the light collection from these nano-objects. First, we show that by changing the dielectric environment of the quantum dot, its decay-rate can be increased. Then, we show the possibility to create photonic wires by covering these nanowire quantum dots with a thick dielectric shell. In the light of microphotoluminescence experiments – which show that these photonic wires efficiently increase the photons collection – and simulations, we discuss the interest of the dipole orientation (parallel or perpendicular to the nanowire growth axis) in these structures
Alibart, Olivier. "Source de photons uniques annoncés à 1550nm en optique guidée pour les communications quantiques". Phd thesis, Université de Nice Sophia-Antipolis, 2004. http://tel.archives-ouvertes.fr/tel-00288268.
Texto completoL'intervalle de temps entre deux paires successives n'étant pas définit, cette source présente un fonctionnement dit « asynchrone ». Afin de caractériser les performances de ce type de source, nous proposons deux méthodes expérimentales originales. La première repose sur un modèle d'analyse des statistiques des détections dans un montage de type « Hanburry Brown & Twiss » pour remonter aux probabilités d'avoir 0, 1 ou 2 photons, tandis que la seconde est une « version asynchrone » du montage original de « Hanburry Brown & Twiss » pour tracer la fonction de corrélation croisée du second-ordre. Les performances de cette première source de photons uniques aux longueurs d'ondes télécom se situent parmi les meilleures au monde avec une probabilité d'avoir un photon unique à 1550nm de 0,37 accompagnée d'une réduction des événements à deux photons d'un facteur 12 par rapport à une source poissonnienne équivalente.
Couteau, Christophe. "Vers une source de photons uniques indiscernables a l'aide de boites quantiques semiconductrices II-VI". Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00110837.
Texto completoLa motivation premiere de ces travaux est la recherche d'une source de photons uniques indiscernables adequate pour etre utiliser dans le cadre de l'information quantique, et plus particulierement de l'ordinateur quantique.
Alibart, Olivier. "Source de photons uniques annoncés à 1550 nm en optique guidée pour les communications quantiques". Nice, 2004. http://www.theses.fr/2004NICE4108.
Texto completoLong 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 down-conversion in a Periodically Poled Lithium Niobate (PPLN) optical waveguide and the idea is to use one of the photons to herald the arrival of the second one. Taking advantage of the guided structure, the photon pairs are collected by a single mode telecom fiber attached to the output of the waveguide. This demonstrates the potential of waveguide technologies for building efficient, stable, and compact sources. The creation time of two successive photons pairs is unknown and the single photons at 1550nm are isolated from others, thanks to the gated detection. Essentially, this is a quantum equivalent of the classical “asynchronous transfer mode”. We point out two means to characterize the efficiency of this type of source. We first investigate an analysis model that allows us to infer the probability of having 0, 1 or 2 photons from the detection on a “Hanbury-Brown & Twiss” type setup, while we build an asynchronous equivalent to the “Hanbury-Brown & Twiss” setup in order to measure the second-order cross-correlation function. This work has lead to the demonstration of having a single photon at with a probability of 0. 37, whereas the multi-photon emission probability is reduced by a factor of 12 compared to weak laser poissonian light sources at equal P1
Couteau, Christophe. "Vers une source de photons uniques indiscernables produits par des boîtes quantiques semiconductrices II-VI". Paris 11, 2005. https://tel.archives-ouvertes.fr/tel-00110837.
Texto completoIn the purpose of realising all optical quantum logic gates, this PhD work explores the possibility of using semiconducting quantum dots from II-VI materials as indistinguishable single photon sources. In the general context of quantum information, we tried to set-up the necessary means to study the formation of excitons and multiexcitons in quantum dots. At liquid helium temperature, we realised spectroscopic studies then we studied the statistics of the photons emitted by the dots. With the help of a photon correlation set-up with high temporal resolution, of the order of 100 ps, we demonstrated the photon antibunching effect, typical signature of a single photon source. This pure quantum effect was done in continuous and pulsed regime. Using two spectrometers, we also measured photon cross-correlations between an exciton and its associated biexciton. Once this work was validated, we had to study the indistinguishability of the of the photons emitted by the quantum dots. The indistinguishability being linked to the spectral purity of the emitted photons, optical coherence measurements were necessary to convey. These measurements showed disappointing first results. In parallel, various methods of pumping, of creating carriers in the dots have been studied in order to optimise and increase the coherence length of the photons created by the excitons while recombining. To conclude, possibilities of future experiments or experiments to complete are described
Laurent, Stéphane. "Cavités à bande interdite photonique bidimensionnelle et application à une source de photons uniques indiscernables". Paris 6, 2006. http://www.theses.fr/2006PA066535.
Texto completoIsolating a single self-assembled InAs/GaAs quantum dot is a way to produce single photons. Moreover, the successively emitted photons can be indistinguishable if the emission process happens sufficiently fast. This radiative lifetime shortening can be obtained by the use of cavity effects (Purcell effect). In this work we describe the development of two-dimensional photonic band gap cavities for that purpose. A first step was the fabrication of GaAs photonic crystal cavities. Then, inserting a single layer of InAs/GaAs quantum dots in the structure, we managed to isolate a single quantum dot coupled to a single cavity mode, in the weak coupling regime. This system is an indistinguishable single photon source, with a degree of photon indistinguishability of 70 %. The observation of the photon indistinguishability is only possible through a shortening of the emitter lifetime, and indicates that the Purcell effect is more than 25 in this system
Gazzano, Olivier. "Sources brillantes de photons uniques indiscernables et démonstration d'une porte logique quantique". Phd thesis, Université Paris-Diderot - Paris VII, 2013. http://tel.archives-ouvertes.fr/tel-01006555.
Texto completoMoreau, Emmanuel. "Étude d'une source solide monomode de photons uniques constituée par une boîte quantique semi-conductrice dans une microcavité optique". Paris 6, 2002. https://tel.archives-ouvertes.fr/tel-00006244.
Texto completoInformes sobre el tema "Source de photons uniques accordable"
O'Connell, Kelly, David Burdick, Melissa Vaccarino, Colin Lock, Greg Zimmerman y Yakuta Bhagat. Coral species inventory at War in the Pacific National Historical Park: Final report. National Park Service, 2024. http://dx.doi.org/10.36967/2302040.
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