Academic literature on the topic 'Indiscernability'
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Journal articles on the topic "Indiscernability":
Gratias, Denis, and Marianne Quiquandon. "Group Theory Considerations in Quasicrystal to Crystal Transformations." Solid State Phenomena 172-174 (June 2011): 931–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.931.
Riha, Rado. "Architecture and new ontologies." SAJ - Serbian Architectural Journal 2, no. 3 (2010): 203–14. http://dx.doi.org/10.5937/saj1003203r.
Wu, Fan, Emmanuel Agu, and Matthew Ward. "Multiresolution Graphics on Ubiquitous Displays using Wavelets." International Journal of Virtual Reality 5, no. 3 (January 1, 2006): 9–15. http://dx.doi.org/10.20870/ijvr.2006.5.3.2693.
VALLÉE, R. "PERCEPTION, DECISION AND ACTION." Journal of Biological Systems 02, no. 01 (March 1994): 43–53. http://dx.doi.org/10.1142/s0218339094000052.
Bodzińska-Bobkowska, Jadwiga. "Auto/bio/géo/graphies : les enjeux spatiaux de la mémoire dans les récits autobiographiques et testimoniaux du temps de la guerre chez Durocher, Langfus, Rawicz." Quêtes littéraires, no. 12 (December 30, 2022): 85–97. http://dx.doi.org/10.31743/ql.14869.
Dissertations / Theses on the topic "Indiscernability":
Hbeich, Elio. "Vérificateur Règlementaire Sémantique et Multi-échelle." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCK105.
Building model inspection (BIM) began with the MvdXML verifier (Fahad et al., 2018; Moult & Krijnen, 2020; Weise et al., 2015). However, the latter had several limitations such as the absence of geometric analysis and a reasoning mechanism. To overcome these, CSTB work published by (Bus, Fahad, et al., 2018) proposes an approach based on semantic web technologies for verifying BIM models against fire rules. This approach takes into account only single-source data (that of the building) and deals only with the building's internal construction rules.Furthermore, the work carried out by CSTB (Bouzidi et al., 2012; Emani, 2016) focuses on rules that verify a condition (property). A property can be a relationship between two elements, or a characteristic of an element. For example, the manhole must be placed at the limit of the private domain, and the height of the building must not exceed 55m. A complex rule is one that verifies several properties at the same time. Analysis of urban rules shows that they are textual, ambiguous, complex, multi-scale and require a large amount of isolated heterogeneous data.My work focuses on extending this verification from the building scale to the urban scale, in a field of application concerning the water supply system. In this context, my thesis aims to specify an ontology integrating the knowledge of business experts (translation of rules into logical language) and heterogeneous data (BIM and GIS). This ontology will be used to verify rules on several verification levels (department, city, district and building). For each verification level, we design a level of abstraction containing the necessary knowledge to be verified. This is done by adapting Hobbs' notion of indistinguishability to the ontology
Proux, Raphaël. "Indiscernabilité des photons émis par une boîte quantique semiconductrice sous excitation résonnante continue." Thesis, Paris, Ecole normale supérieure, 2015. http://www.theses.fr/2015ENSU0037/document.
Quantum dots are good candidates as single photon emitters for quantum information networks, facilitating their integration in photonic circuits based on well known semiconductor technology. In this context, this work focuses on the indistinguishability of the photons emitted by semiconductor quantum dots excited resonantly. We use a peculiar configuration where the quantumdots are embedded in a planar microcavity, allowing for better excitation and collection efficiencies. We are then able to investigate very low excitation power regimes, where the photons are elastically scattered by the fundamental transition of the quantum dot (Resonant Rayleigh Scattering). In this regime, the coherence of the excitation laser is imprinted on the emitted photons, making the quantum dot a source of single photons with a very long coherence.The indistinguishability is investigated by using a Hong–Ou–Mandel interferometer to perform two-photon interference. We carry out a comprehensive experimental study of the excitation power dependence of the indistinguishability as well as its dependence on the excitation laser coherence, which shows the important role of elastic scattering in the low excitation power limit. It appears that a new figure of merit needs to be introduced to assess the indistinguishability as a temporal phenomenon, an aspect which is particularly relevant when dealing with continuous-wave excitation
Pavolini, Donatella. "Étude théorique et mise en évidence expérimentale du phénomène de subradiance." Paris 11, 1986. http://www.theses.fr/1986PA112252.
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.
In 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
Reigue, Antoine. "Boîte quantique en interaction avec son environnement : excitation résonante pour l'étude des processus de décohérence." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066731/document.
Developments in quantum information processes require the use of solid state qubits that would emit on demand single and indistinguishable photons. Semiconductor quantum dots (QDs) show an atom-like spectrum which makes them attractive in this regard. However, a single QD constitutes an open quantum system coupled to its surrounding solid-state environment, the phonon bath and the fluctuating electrostatic environment. This has important consequences on the coherence properties of the electronic system and the QD is a probe to study these fundamental interactions. Using Fourier spectroscopy and temperature-dependent resonant HOM experiments we show that these two mechanisms occur on very different time scales: spectral diffusion is a slow dephasing process acting on microseconds, while phonon interaction takes place in less than one ns. Then, the loss of ndistinguishability in HOM measurements is only related to dephasing induced by the coupling to the phonon bath. The TPI visibility is preserved around 85 % at low temperature, followed by a rapid loss of coherence. To fully understand the experimental results we developed a mircroscopic model for the electron-phonon interaction which allow to obtain analytic expressions for the dephasing rates. Below 10K the relaxation of the vibrational lattice is the dominant contribution to the loss of TPI visibility. This process corresponds to real phonon transitions resulting in a broad phonon sideband in the QD emission spectra. Above 10K, virtual phonon transitions to higher lying excited states become the dominant dephasing mechanism, leading to broadening of the zero phonon line and a corresponding rapid decay in the visibility
Autebert, Claire. "AlGaAs photonic devices : from quantum state generation to quantum communications." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC166/document.
One of the main issues in the domain of quantum information and communication is the generation,manipulation and detection of several qubits on a single chip. Several approaches are currentlyinvestigated for the implementation of qubits on different types of physical supports and a varietyof quantum information technologies are under development: for quantum memories, spectacularadvances have been done on trapped atoms and ions, while to transmit information, photons arethe ideal support thanks to their high speed of propagation and their almost immunity againstdecoherence. My thesis work has been focused on the conception, fabrication and characterization ofa miniaturized semiconductor source of entangled photons, working at room temperature and telecomwavelengths. First the theoretical concepts relevant to understand the work are described (chapter1). Then the conception and fabrication procedures are given (chapter 2). Chapter 3 presents theoptoelectronics characterization of the device under electrical pumping, and chapter 4 the resultson the optical losses measurements and the nonlinear optical characterization (second harmonicgeneration, spontaneous parametric down conversion and joint spectral intensity reconstruction).Chapters 5 and 6 focus on the characterization of the quantum state generated by a passive sample(demonstration of indistinguishability and energy-time entanglement) and its utilization in a multiuserquantum key distribution protocol (polarization entanglement). Finally the work on the firstelectrically driven photon pairs source emitting in the telecom range and working at room temperatureis presented (chapter 7)
Monniello, Leonard. "Excitation résonante de boîtes quantiques pour la génération d'états non-classiques de la lumière." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066052/document.
Developments in quantum information require controlling and manipulating quantum bits. Among solid state emitters, semiconductor quantum dots seem promising to realize quantum bits. First, the nanometric size of those structures leads to the confinement of the carriers in the three directions of space, so that their energy spectrum becomes atom-like. Furthermore, they can easily be integrated into electronic and optic devices. Such structures are studied for their optical properties, especially the emission of single and indistinguishable photons, which are quantum states of light. In the present work InAs/GaAs quantum dots have been studied under resonant excitation with picosecond laser pulses. One-dimensional waveguiding geometry has been used to suppress the scattered excitation laser allowing the observation of a single dot resonant luminescence. The coupling between the laser and the dot leads to the Rabi oscillations regime which enables to address a coherent superposition of states in the two-level system, meaning a quantum bit. However, the coupling between the dot and its environment changes the coherence properties of the dots, limiting the time during which operations on the qubits are possible. Two main phenomena have been observed and studied: the interaction between the dots and the longitudinal acoustic phonons of the GaAs matrix and the coupling with the electromagnetic mode. Finally, the photon emission statistics of the quantum dots have been studied, showing that quantum dots are on demand good emitters of indistinguishable single photons
Imanaliev, Almazbek. "Towards testing Bell's inequality using atoms correlated in momentum." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLO003/document.
This manuscript describes quantum atom optics experiments using metastable helium atoms with a single-atom momentum resolved detector. In the first part of this manuscript, the second order correlation measurement of the superradiance from a metastable helium Bose-Einstein condensate is presented. The superradiance effect is the collective radiation of dense ensemble where a strong gain of the radiation is expected. We have shown the thermal like statistics of the emission even in the presence of the strong gain. The next part of the manuscript is devoted to the quantum nonlocality test using a pair of atoms entangled in momentum. The protocol we came up with is inspired from the one of Rarity and Tapster with pairs of photons entangled in momentum. The essential ingredients of this protocol are the atomic pair produced by dynamical instability of the Bose-Einstein condensate in a moving optical lattice, the coherent control of the atomic pair by Bragg diffraction and the correlation measurement of the atoms in different output modes of the interferometric protocol. The experimental characterization and preparation of coherent control by Bragg diffraction are presented showing the proof of principle of such a protocol. The last part of the manuscript discusses the realization of the atomic Hong-Ou-Mandel experiment using the same atomic pair with an atomic beamsplitter. The non-classical interference result of this experiment has opened an opportunity for us to realize Bell’s inequality test with massive particles correlated in external degrees of freedom
Book chapters on the topic "Indiscernability":
Gondran, Michel, and Sébastien Lepaul. "Indiscernability and Mean Field, a Base of Quantum Interaction." In Quantum Interaction, 218–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35659-9_20.
Conference papers on the topic "Indiscernability":
Gondran, Michel, and Alexandre Gondran. "Collisions, indiscernability and the spin-statistics theorem." In QUANTUM THEORY: RECONSIDERATION OF FOUNDATIONS 6. AIP, 2012. http://dx.doi.org/10.1063/1.4773151.