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Bibliografie tematiche / Spontaneous Parametric Down Convertion

Letteratura scientifica selezionata sul tema "Spontaneous Parametric Down Convertion"

Autore: Grafiati

Pubblicato: 1 giugno 2024

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Articoli di riviste sul tema "Spontaneous Parametric Down Convertion":

1

Kitaeva, G. Kh, e A. N. Penin. "Spontaneous parametric down-conversion". Journal of Experimental and Theoretical Physics Letters 82, n. 6 (settembre 2005): 350–55. http://dx.doi.org/10.1134/1.2137372.

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2

Couteau, Christophe. "Spontaneous parametric down-conversion". Contemporary Physics 59, n. 3 (3 luglio 2018): 291–304. http://dx.doi.org/10.1080/00107514.2018.1488463.

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3

Lange, Nina Amelie, Jan Philipp Höpker, Raimund Ricken, Viktor Quiring, Christof Eigner, Christine Silberhorn e Tim J. Bartley. "Cryogenic integrated spontaneous parametric down-conversion". Optica 9, n. 1 (14 gennaio 2022): 108. http://dx.doi.org/10.1364/optica.445576.

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4

Peřina, Jan, e Jaromír Křepelka. "Multimode description of spontaneous parametric down-conversion". Journal of Optics B: Quantum and Semiclassical Optics 7, n. 9 (2 agosto 2005): 246–52. http://dx.doi.org/10.1088/1464-4266/7/9/003.

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5

Zhang, Chao, Yun‐Feng Huang, Bi‐Heng Liu, Chuan‐Feng Li e Guang‐Can Guo. "Spontaneous Parametric Down‐Conversion Sources for Multiphoton Experiments". Advanced Quantum Technologies 4, n. 5 (22 marzo 2021): 2000132. http://dx.doi.org/10.1002/qute.202000132.

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6

Spillane, Sean M., Marco Fiorentino e Raymond G. Beausoleil. "Spontaneous parametric down conversion in a nanophotonic waveguide". Optics Express 15, n. 14 (2007): 8770. http://dx.doi.org/10.1364/oe.15.008770.

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7

Akatiev, Dmitrii, Kirill Boldyrev, Nikolai Kuzmin, Ilnur Latypov, Marina Popova, Andrey Shkalikov e Alexey Kalachev. "Towards spontaneous parametric down-conversion at low temperatures". EPJ Web of Conferences 161 (2017): 02002. http://dx.doi.org/10.1051/epjconf/201716102002.

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8

Rubin, Morton H. "Transverse correlation in optical spontaneous parametric down-conversion". Physical Review A 54, n. 6 (1 dicembre 1996): 5349–60. http://dx.doi.org/10.1103/physreva.54.5349.

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9

Joshi, Amitabh, e Shoukry S. Hassan. "Spontaneous parametric down-conversion using a pulse train". Journal of Nonlinear Optical Physics & Materials 23, n. 03 (settembre 2014): 1450032. http://dx.doi.org/10.1142/s0218863514500325.

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Abstract (sommario):

The process of spontaneous parametric down-conversion (SPDC) is studied for the case in which the pump is a train of pulses. Effects of such a train of pulses (equivalent to a frequency comb) on degenerate collinear type-II SPDC and degenerate collinear type-I SPDC are analyzed using the probability of photon coincidence counts and compared with the case when the medium is pumped by a single pulse.

10

Peng, Yu, Minghe Wu, Sheng Chen e Zhibin Fan. "Discussion on Spontaneous Parametric Down-conversion (SPDC) Based on Parametric Oscillator Model". Journal of Physics: Conference Series 1838, n. 1 (1 marzo 2021): 012066. http://dx.doi.org/10.1088/1742-6596/1838/1/012066.

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Più fonti

Tesi sul tema "Spontaneous Parametric Down Convertion":

1

Ahlrichs, Andreas. "Triply-Resonant Cavity-Enhanced Spontaneous Parametric Down-Conversion". Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20150.

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Die verlässliche Erzeugung einzelner Photonen mit wohldefinierten Eigenschaften in allen Freiheitsgraden ist entscheidend für die Entwicklung photonischer Quantentechnologien. Derzeit basieren die wichtigsten Einzelphotonenquellen auf dem Prozess der spontanen parameterischen Fluoreszenz (SPF), bei dem ein Pumpphoton in einem nichtlinearen Medium spontan in ein Paar aus Signal und Idlerphotonen zerfällt. Resonator-überhöhte SPF, also das Plazieren des nichtlinearen Mediums in einem optischen Resonator, ist ein weit verbreitetes Verfahren, um Einzelphotonenquellen mit erhöhter Helligkeit und angepassten spektralen Eigenschaften zu konstruieren. Das Anpassen der spektralen Eigenschaften durch gezielte Auswahl der Resonatoreigenschaften ist besonders für hybride Quantentechnologienvon Bedeutung, welche darauf abzielen, unterschiedliche Quntensysteme so zu kombinieren, dass sich deren Vorteile ergänzen. Diese Arbeit stellt eine umfassende theoretische und experimentelle Analyse der dreifach resonanten SPF vor. Das aus der Literatur bekannte theoretische Modell wird diesbezüglich verbessert, dass der Einfluss sämtlicher Eigenschaften des Resonators auf die wichtigen experimentellen Größen (z.B. die Erzeugungsrate) gezielt ausgewertet werden kann. Dieses verbesserte und hoch genaue Modell stellt eine wichtige Grundlage für die Entwicklung und Optimierung neuartiger Photonenpaarquellen dar. Im experimentellen Teil dieser Arbeit wird der Aufbau und die Charakterisierung einer dreifach resonanten Photonenpaarquellen präsentiert. Die neu entwickelte digitale Regelelektronik sowie ein hochstabiler, schmalbandiger Monochromator welcher auf monolitischen, polarisationsunabhängigen Fabry-Pérot Resonatoren basiert, werden vorgestellt. Indem diese temperaturstabilisierten Resonatoren als Spetrumanalysator verwendet werden, wird zum ersten Mal die Frequenzkammstruktur des Spektrums der erzeugten Signal- und Idlerphotonen nachgewiesen. Des Weiteren wird der Einfluss der Pumpresonanz auf die Korrelationsfunktion und die Zweiphotoneninterferenz von Signal- und Idlerphotonen simuliert und vermessen. Abschließend werden Experimente aus dem Bereich der hybriden Quantennetzwerke präsentiert, in welchen Quantenfrequenzkonversion verwendet wird um die erzeugten Signalphotonen in das Telekommunikationsband zu transferieren. Dabei wird nachgewiesen, dass das temporale Wellenpaket durch die Konversion nicht beeinflusst wird und aufgezeigt, wie Quantennetzwerke von kommerziellen Telekommunikationstechnologien profitieren können.
The consistent generation of single photons with well-defined properties in all degrees of freedom is crucial for the development of photonic quantum technologies. Today, the most prominent sources of single photons are based on the process of spontaneous parametric down-conversion (SPDC) where a pump photon spontaneously decays into a pair of signal and idler photons inside a nonlinear medium. Cavity-enhanced SPDC, i.e., placing the nonlinear medium inside an optical cavity, is widely used to build photon-pair sources with increased brightness and tailored spectral properties. This spectral tailoring by selective adjustment of the cavity parameters is of particular importance for hybrid quantum technologies which seek to combine dissimilar quantum systems in a way that their advantages complement each other. This thesis provides a comprehensive theoretical and experimental analysis of triply-resonant cavity-enhanced SPDC. We improve the theoretical model found in the literature such that the influence of all resonator properties on the important experimental parameters (e.g., the generation rate) can be analyzed in detail. This convenient and highly accurate model of cavity-enhanced SPDC represents an important basis for the design and optimization of novel photonpair sources. The experimental part of this thesis presents the setup and characterization of a triply-resonant photon-pair source. We describe the digital control system used to operate this source over days without manual intervention, and we present a highly stable, narrow-linewidth monochromator based on cascaded, polarization-independent monolithic Fabry-Pérot cavities. Utilizing these temperature-stabilized cavities as a spectrum analyzer, we verify, for the first time, the frequency comb spectral structure of photons generated by cavity-enhanced SPDC. We further simulate and measure the impact of the pump resonance on the temporal wave-packets and the two-photon interference of signal and idler photons. Finally, we present a series of experiments in the context of hybrid quantum networks where we employ quantum frequency conversion (QFC) to transfer the generated signal photons into the telecommunication band. We verify the preservation of the temporal wave-packet upon QFC and highlight how quantum networks can benefit from advanced commercial telecommunication technologies.

2

Galinis, Justinas. "Research on spontaneous parametric down-conversion pumped by incoherent light sources". Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140925_134845-59928.

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Spontaneous parametric down conversion (SPDC) – incoherent light scattering – is one of the main entangled photons source applied in quantum optics experiments. The tradition to pump SPDC by laser radiation was established from the very first SPDC experiments in 1968. The aim of this thesis was experimentally to investigate the ability to generate an SPDC pumping by both temporal and spatially incoherent radiation - a high-power blue LED. Weak SPDC signals were registered with high sensitivity CCD cameras, photons coincidences were detected with photon counters. The theoretical simulations were performed in parallel with experiments. Therefore, mathematical simulation code was written in order to estimate the SPDC power distribution and simulate photon coincidence experiment changing the properties of pump beam and detection system. Experimental results reveal that incoherent light sources can be good alternative for the laser systems in order to generate average quality biphoton fields especially in those experiments in which low biphoton field coherency would be advantage. The main advantages of the incoherent sources over laser systems are low cost, simple production technology and the huge commercial variety of different wavelength sources.
Parametrinė fluorescencija (PF) – nekoherentinė šviesos sklaida – yra vienas pagrindinių susietųjų fotonų šaltinių taikomų kvantinės optikos eksperimentuose. Nuo pat pirmųjų PF eksperimentinių tyrimų 1968 metais įsigalėjo tradicija šį reiškinį žadinti išimtinai lazerine spinduliuote. Šios disertacijos tikslas – eksperimentiškai ištirti galimybę generuoti PF tiek laikiškai, tiek ir erdviškai nekoherentine spinduliuote – didelės galios šviesos diodu. Atliekant tyrimus didelio jautrio CCD kamera buvo registruojami silpni PF signalai, pavienių fotonų skaitliukais buvo registruojami fotonų sutapimai,. Lygiagrečiai eksperimentiniams tyrimams buvo atliekami teoriniai skaičiavimai. Šiuo tikslu buvo parašytas matematinio modeliavimo programinis kodas, skirtas įvertinti PF erdvinį galios pasiskirstymą bei modeliuoti fotonų sutapimų eksperimentą, keičiant kaupinimo pluošto ir detekcijos sistemos savybes. Šio darbo rezultatai atskleidžia, kad nekoherentiniai šaltiniai gali būti puiki alternatyva lazerinėms sistemoms siekiant žadinti vidutinės kokybės dvyninius laukus, ypatingai tokiose tyrimų srityse, kuriose mažas dvyninio lauko koherentiškumas būtų didžiulis privalumas. Pagrindiniai nekoherentinių šaltinių pranašumai prieš lazerines sistemas: maža kaina, paprasta gamybos technologija ir didžiulė komercinė skirtingo bangos ilgio šaltinių įvairovė.

3

Zielińska, Joanna Ada. "Spontaneous parametric down-conversion sources for generation of atom-resonant quantum light". Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/481985.

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This thesis studies different designs of optical parametric oscillators as sources of atom-resonant quantum light resonant with the rubidium D1 line.We analyze the mode structure and filtering techniques in a conventional OPO based on a crystal inside a ring cavity. We also present a first fully-tunable design of a monolithic doubly-resonant OPO. The first part presents the study of a multimode optical parametric oscillator from the theoretical point of view, calculating a multimode Bogoliubov transformation and a time-domain intensity correlation function. Next, we experimentally observe signatures of multi- and singlemode OPO output in pairwise time-of-arrival correlations of the generated photons, achieved thanks to Faraday anomalous dispersion filtering technique based on optical properties of atomic vapor in magnetic field. The second, more extensive part of the thesis features the study of a new design of the OPO, a monolithic cavity (crystal polished and coated so that it forms a cavity) that allows full tunability even in a multiply resonant configuration. The architecture we propose combines the advantages of a conventional ring cavity based OPO, with robustness, lowmaintenance, compactness and stability characteristic of monolithic systems. The tunability of the doubly-resonant monolithic OPO is realized by maintaining different sections of the crystal at different temperatures and pressing it with a piezoelectric actuator. The tuning method is tested when the system is employed as a second harmonic generator. In addition, we describe a new nonlinear effect that comes into play when the monolithic cavity is pumped with 795 nm light. The phenomenon,that we call a photo-Kerr effect causes the cavity behavior resembling optical bistability due to Kerr nonlinearity, but with the magnitude (Kerr coefficient) dependent on the long-time average of intra-cavity power. The model we propose agrees well with the experimental results. The effect simplifies greatly the cavity stabilization, causing the cavity to maintain itself close to resonance even as the laser wavelength is changed by more than a free spectral range. The thesis concludes by studying the suitability of the monolithic cavity with the photo-Kerr effect for squeezed light generation. We test the monolithic cavity as an OPO and demonstrate 1.6 dB of quadrature squeezing via homodyne detection.
Esta tesis estudia diferentes diseños de osciladores paramétricos (OPO, por sus signas en inglés) como fuentes de luz cuántica resonante con la línea D1 de átomos de rubidio. Analizamos la estructura de modos y las técnicas de filtrado en un oscilador paramétrico convencional basado en un cristal no lineal dentro de una cavidad. También presentamos el primer diseño de un OPO monolítico con dos resonancias con frecuencias ajustables. La primera parte de la tesis presenta el estudio de un oscilador paramétrico multimodo desde el punto de vista teórico, calculando una transformación de Bogoliubov multimodo y una función de correlación temporal de intensidad. A continuación, se observan experimentalmente las señales de la emisión de OPO multimodo o de un solo modo en correlaciones de tiempo de llegada de pares de los fotones generados, obtenidos gracias a la técnica de filtración de dispersión anómala de Faraday basada en las propiedades ópticas del vapor atómico en campo magnético. La segunda y más extensa parte de la tesis presenta el estudio de un nuevo diseño del OPO: una cavidad monolítica (cristal pulido y recubierto de tal manera que forma una cavidad) que permite ajustar las frecuencias de resonancia, incluso en una configuración multi-resonante. La arquitectura que proponemos combina las ventajas de una OPO convencional basada en una cavidad afuera de cristal, con robustez, bajo mantenimiento, compacidad y estabilidad característica de los sistemas monolíticos. La ajustibilidad del OPO monolítico con doble resonancia se realiza manteniendo diferentes secciones del cristal a diferentes temperaturas y presionándolo con un element piezoeléctrico. El método de afinación es sometido a prueba cuando el sistema se emplea como generador de segundo armónico. Además, describimos un nuevo efecto no lineal que entra en juego cuando la cavidad monolítica se bombea con luz 795 nm. El fenómeno que denominamos efecto photo-Kerr provoca que el comportamiento de la cavidad se asemeje a la biestabilidad óptica debido a la no linealidad de Kerr, pero con la magnitud (coeficiente de Kerr) dependiente del promedio de tiempo largo de la potencia de la luz dentro de la cavidad. El modelo numérico que proponemos coincide con los resultados experimentales. El efecto simplifica en gran medida la estabilización de la cavidad, hacienda que ésta se mantenga cerca de la resonancia incluso cuando la longitud de onda del láser cambia en más de la distancia entre dos resonancias consecutivas. La tesis concluye estudiando la idoneidad de la cavidad monolítica con el efecto photo-Kerr para la generación de luz comprimida. Se emplea la cavidad monolítica como oscilador paramétrico, obteniando luz comprimida y se demuestra 1.6 dB de squeezing mediante detección homodina.

4

Sevilla, Carlos Andres. "Direct Observation of Conservation of Orbital Angular Momentum in Collinear Type-I Spontaneous Parametric Down-Conversion". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543326773239719.

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5

Ahlrichs, Andreas [Verfasser], Oliver [Gutachter] Benson, Jürgen [Gutachter] Eschner e Günter [Gutachter] Steinmeyer. "Triply-Resonant Cavity-Enhanced Spontaneous Parametric Down-Conversion / Andreas Ahlrichs ; Gutachter: Oliver Benson, Jürgen Eschner, Günter Steinmeyer". Berlin : Humboldt-Universität zu Berlin, 2019. http://d-nb.info/1191175340/34.

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6

Galinis, Justinas. "Parametrinės fluorescencijos žadinamos nekoherentiniais šviesos šaltiniais tyrimas". Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140925_134905-11051.

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Abstract (sommario):

Parametrinė fluorescencija (PF) – nekoherentinė šviesos sklaida – yra vienas pagrindinių susietųjų fotonų šaltinių taikomų kvantinės optikos eksperimentuose. Nuo pat pirmųjų PF eksperimentinių tyrimų 1968 metais įsigalėjo tradicija šį reiškinį žadinti išimtinai lazerine spinduliuote. Šios disertacijos tikslas – eksperimentiškai ištirti galimybę generuoti PF tiek laikiškai, tiek ir erdviškai nekoherentine spinduliuote – didelės galios šviesos diodu. Atliekant tyrimus didelio jautrio CCD kamera buvo registruojami silpni PF signalai, pavienių fotonų skaitliukais buvo registruojami fotonų sutapimai,. Lygiagrečiai eksperimentiniams tyrimams buvo atliekami teoriniai skaičiavimai. Šiuo tikslu buvo parašytas matematinio modeliavimo programinis kodas, skirtas įvertinti PF erdvinį galios pasiskirstymą bei modeliuoti fotonų sutapimų eksperimentą, keičiant kaupinimo pluošto ir detekcijos sistemos savybes. Šio darbo rezultatai atskleidžia, kad nekoherentiniai šaltiniai gali būti puiki alternatyva lazerinėms sistemoms siekiant žadinti vidutinės kokybės dvyninius laukus, ypatingai tokiose tyrimų srityse, kuriose mažas dvyninio lauko koherentiškumas būtų didžiulis privalumas. Pagrindiniai nekoherentinių šaltinių pranašumai prieš lazerines sistemas: maža kaina, paprasta gamybos technologija ir didžiulė komercinė skirtingo bangos ilgio šaltinių įvairovė.
Spontaneous parametric down conversion (SPDC) – incoherent light scattering – is one of the main entangled photons source applied in quantum optics experiments. The tradition to pump SPDC by laser radiation was established from the very first SPDC experiments in 1968. The aim of this thesis was experimentally to investigate the ability to generate an SPDC pumping by both temporal and spatially incoherent radiation - a high-power blue LED. Weak SPDC signals were registered with high sensitivity CCD cameras, photons coincidences were detected with photon counters. The theoretical simulations were performed in parallel with experiments. Therefore, mathematical simulation code was written in order to estimate the SPDC power distribution and simulate photon coincidence experiment changing the properties of pump beam and detection system. Experimental results reveal that incoherent light sources can be good alternative for the laser systems in order to generate average quality biphoton fields especially in those experiments in which low biphoton field coherency would be advantage. The main advantages of the incoherent sources over laser systems are low cost, simple production technology and the huge commercial variety of different wavelength sources.

7

Maltese, Giorgio. "Generation and manipulation of high-dimensional photonics states with AlGaAs chips". Thesis, Sorbonne Paris Cité, 2019. https://theses.md.univ-paris-diderot.fr/MALTESE_Giorgio_2_complete_20190915.pdf.

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Cette thèse est consacrée au développement de nouveaux dispositifs semi-conducteurs intégrés et de méthodes pour la génération et la manipulation d'états lumineux de haute dimension. Nous présentons l'étude d'un guide d'onde AlGaAs utilisant un processus de conversion paramétrique spontanée de type II en régime de pompage monochromatique, s’intéressant en particulier à l'amplitude spectrale jointe de l'état émis. La source fonctionne à température ambiante, émet des paires de photons dans le domaine des télécommunications et est compatible avec l'injection électrique. La génération d'états biphotoniques à large bande est démontrée expérimentalement par la reconstruction de l'intensité spectrale jointe et par une expérience de Hong-Ou-Mandel indiquant que les photons signal et complémentaire sont émis sur une large bande spectrale (170 nm) et avec un haut degré d'indiscernabilité (V=0,86). De plus, nous montrons que l'effet de cavité dû à la réflectivité des facettes des guides d'onde conduit à la production de peignes de fréquence à deux photons. Cette plateforme est utilisée pour démontrer une méthode originale de génération et de contrôle de la symétrie des états peignes exploitant les effets de cavité et un retard imposé entre les deux photons de chaque paire. Plus spécifiquement, nous montrons qu'un réglage fin de la fréquence de la pompe permet de générer des états peignes résonnants et anti-résonants permettant de manipuler la symétrie de la fonction d'onde. La méthode peut être adaptée et appliquée à une grande variété de systèmes, massifs ou intégrés, augmentant ainsi leur flexibilité et la richesse des états générés en vue de la mise en œuvre de nouveaux protocoles d'information quantique. En outre, nous démontrons la réalisation d'un guide d'onde AlGaAs pour la génération de faisceaux lumineux portant un moment angulaire de spin et présentons la conception d'un dispositif pour la génération d'un faisceau lumineux portant un moment orbital angulaire de premier ordre
This thesis is devoted to the development of novel integrated semiconductor devices and methods for the generation and manipulation of high-dimensional states of light. We report on the study of an AlGaAs waveguide implementing type-II spontaneous parametric down conversion process in a monochromatic pump regime, with a focus on the joint spectral amplitude of the emitted biphoton state. The source works at room temperature, emits photon pairs in the telecom range and is compliant with electrical injection. The generation of broadband biphoton states is experimentally demonstrated via the reconstruction of the joint spectral intensity and via a Hong-Ou-Mandel experiment indicating that signal and idler photons are emitted over a large bandwidth (170nm) and with a high degree of indistinguishability (V=0.86). Moreover, we show that the cavity effect due to waveguide facets reflectivity leads to the production of biphoton frequency-comb states. This platform is used to demonstrate an original method to generate and control the symmetry of biphoton frequency combs exploiting cavity effects and a delay between the two photons of each pair. More specifically, we show that a fine tuning of the pump frequency enables the generation of resonant and anti-resonant comb states allowing to manipulate the wavefunction symmetry. The method can be adapted and applied to a large variety of systems, either bulk or integrated, thus increasing their flexibility and the richness of the generated states in view of implementation of new quantum information protocols.In addition, we demonstrate the realization of an AlGaAs ridge waveguide for the generation of light beams with tailored phase and polarization distributions, carrying spin angular momentum, and present the design of a device for the generation of a twisted light beam, carrying first order orbital angular momentum

8

Ming-Feng, Tu. "Create and Measure the Spontaneous Parametric Down Conversion". 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2907200510491300.

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9

Tu, Ming-Feng, e 涂銘峰. "Create and Measure the Spontaneous Parametric Down Conversion". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/68950441450579238973.

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Abstract (sommario):

碩士
國立臺灣大學
物理研究所
93
We hope to verify the conservation of orbital angular momentum (OAM) of light under the spontaneous parametric down-conversion (SPDC) process. We use laser(with 355nm-wavelength) to pump a β − BaB2O4 (BBO) crystal. Because of the nonlinear property of the BBO crystal, the degenerate SPDC could happen in the crystal. Therefore, one 355nm photon would converted to two 710nm photons. We make use of the birefringence property of the BBO crystal to achieve beamlike Type II phase-matching. Under this phase-matching, it is efficient to collect the down-converted 710nm light. We plan to make the pump light carry the OAM with l = 0 or l = 1 by means of the hologram. On the other way, we use a new-reported method to measure the OAM of the down-converted 710nm light. And, making use of the coincidence-counting tool, we could verify the conservation of OAM of light. Under the SPDC process, the down-converted 710nm photon pairs are in the entangled state. Therefore, this experiment is related to the OAM of light and the entangled state which the quantum theory predicts. These two subjects are worthy of studying.

10

Antonosyan, Diana. "Non-Hermitian quantum and classical integrated nonlinear photonics". Phd thesis, 2016. http://hdl.handle.net/1885/110883.

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Integrated optical quantum circuits based on photonic waveguiding structures are increasingly gaining attention as a possible solution for scalable quantum technologies with important applications to quantum simulations. Quantum communication provides secure information transmission, but the distance over which quantum states of light can be distributed without significant disturbance is limited due to inescapable losses and noise in optical elements. Loss is the greatest challenge facing the implementation of integrated photonic technologies, and it is inescapable in experimental reality. In recent years there is a rise of interest in structures with spatially inhomogeneous losses. Light propagation in waveguiding structures with spatially distributed sections of loss can be used for implementation of quantum plasmonic circuits, which are able to strongly confine light to sub-wavelength dimensions, as well as for parity-time (PT) symmetric structures, with phase transition associated with PT-symmetry breaking, which opens new possibilities for light manipulation. The PhD thesis contains research on the controllable classical and quantum dynamics of optical frequency conversion processes in quadratically nonlinear photonic integrated circuites in the presence of losses. Namely, I discuss spontaneous parametric down-conversion (SPDC), sum-frequency generation (SFG) and optical parametric amplification (OPA) in nonlinear structures governed by non-Hermition Hamiltonians. I explore the fundamental features of multi-photon generation in integrated nonlinear waveguides. I have been shown that arrays of coupled nonlinear waveguides can serve as a robust integrated platform for the generation of entangled photon states with nonclassical spatial correlations through spontaneous parametric down-conversion (SPDC), and that the operation of such quantum circuit is tolerant even to relatively high losses. Furthermore, I have studied the bi-photon multimode quantum emission tomography in waveguide structures with spatially inhomegeneous losses. The PhD thesis also covers the research on the effect of these losses in waveguide couplers possessing parity-time (PT) symmetry. I have identified an anti-PT spectral symmetry of a parametric amplifier based on those couplers. Finally, I describe the single-photon conversion to a photon pair, and identify opportunities for the efficient enhancement of this process.

Capitoli di libri sul tema "Spontaneous Parametric Down Convertion":

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Brida, Giorgio, Valentina Caricato, Marco Genovese, Marco Gramegna, Mikhail V. Fedorov e Sergey P. Kulik. "Entanglement Degree Characterization of Spontaneous Parametric-Down Conversion Biphotons in Frequency Domain". In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 46–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11731-2_6.

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Zhou, Zhi-Yuan, e Bao-Sen Shi. "Generation and Manipulation of Nonclassical Photon Sources in Nonlinear Processes". In Single Photon Manipulation. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.90268.

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Abstract (sommario):

Nonclassical photon sources are key components in quantum information science and technology. Here, the basic principles and progresses for single photon generation and their further manipulation based on second- or third-order nonlinear processes in various degrees of freedom are briefly reviewed and discussed. Based on spontaneous parametric down-conversion and spontaneous four-wave mixing, various nonlinear materials such as quasi-phase-matching crystals, dispersion-shifted fibers, and silicon-on-insulator waveguides are used for single photon generation. The kinds of entanglement generated include polarization, time-energy, time-bin, and orbital angular momentum. The key ingredient for photon pair generation in nonlinear processes is described and discussed. Besides, we also introduce quantum frequency conversion for converting a single photon from one wavelength to another wavelength, while keeping its quantum properties unchanged. Finally, we give a comprehensive conclusion and discussion about future perspectives for single photon generation and manipulation in nonlinear processes. This chapter will provide an overview about the status, current challenge, and future perspectives about single photon generation and processing in nonlinear processes.

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Peřina, Jan. "Spontaneous Parametric Down-Conversion in Nonlinear Layered Structures". In Progress in Optics, 89–158. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-444-63379-8.00002-7.

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4

Kenyon, Ian R. "Entanglement". In Quantum 20/20, 151–62. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198808350.003.0009.

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The distiction between classical product states and quantum entangled states is disclosed with examples. Spontaneous parametric down conversion as a source of entangled photons is described. The action of a perfect beam splitter is analysed using creation and annihilation operators. The HOM interferometer is described. Its use in demonstrating the indistinguishability of photons and in measuring bandwidth of sources at the level of femtoseconds is recounted. Two particle entanglement is analysed using the Bloch sphere representation showing how the full knowledge of the entangled state does not fix the state of the individual particles. The four Bell states, eigenstates of two particle entanglement, are introduced. Teleportation of a photon state using entangled photons is described, and an experiment to entangle the quantum states of atoms at space-like separation outlined.

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Ahmadi, Arash, Andreas Fognini e Michael E. Reimer. "Toward On-Demand Generation of Entangled Photon Pairs with a Quantum Dot". In Recent Advances in Nanophotonics - Fundamentals and Applications. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.91814.

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The generation of on-demand, optimally entangled photon pairs remains one of the most formidable challenges in the quantum optics and quantum information community. Despite the fact that recent developments in this area have opened new doors leading toward the realization of sources exhibiting either high brightness or near-unity entanglement fidelity, the challenges to achieve both together persist. Here, we will provide a historical review on the development of quantum dots (QDs) for entangled photon generation, with a focus on nanowire QDs, and address the latest research performed on nanowire QDs, including measuring entanglement fidelity, light-extraction efficiency, dephasing mechanisms, and the detrimental effects of detection systems on the measured values of entanglement fidelity. Additionally, we will discuss results recently observed pertaining to resonant excitation of a nanowire QD, revealing the potential of such sources to outperform spontaneous parametric down-conversion (SPDC) sources, providing a viable solution to the current challenges in quantum optics and quantum information.

Atti di convegni sul tema "Spontaneous Parametric Down Convertion":

1

Chekhova, Maria. "Nanoscale Spontaneous Parametric Down-Conversion". In Nonlinear Optics. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/nlo.2021.nm2b.1.

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Lange, Nina Amelie, Timon Schapeler, Jan Philipp Höpker, Maximilian Protte e Tim J. Bartley. "Cryogenic Degenerate Spontaneous Parametric Down-Conversion". In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/quantum.2023.qw2a.17.

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We show a HOM dip between degenerate signal and idler photons at (1559.33 ± 0.05) nm from cryogenic integrated SPDC in lithium niobate, compatible with superconducting detectors. This is enabled by precise control over the cryogenic phase-matching.

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Lukš, Antonín, Vlasta Peřinová e Jaromír Křepelka. "Surface effect on spontaneous parametric down-conversion". In 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, a cura di Jan Peřina, Libor Nozka, Miroslav Hrabovský, Dagmar Senderáková, Waclaw Urbańczyk e Ondrej Haderka. SPIE, 2012. http://dx.doi.org/10.1117/12.2012005.

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Fedotova, Anna, Tomas Santiago-Cruz, Vitaliy Sultanov, Maximilian Weissflog, Mohammadreza Younesi, Isabelle Staude, Thomas Pertsch, Frank Setzpfandt e Maria V. Chekhova. "Spontaneous Parametric Down-Conversion in Nonlinear Metasurfaces". In 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2021. http://dx.doi.org/10.1109/cleo/europe-eqec52157.2021.9541660.

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Bennink, Ryan S. "Spontaneous Parametric Down-Conversion in Structured Environments". In International Conference on Quantum Information. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/icqi.2007.ifc5.

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Brańczyk, Agata M., Thomas M. Stace, T. C. Ralph, Timothy Ralph e Ping Koy Lam. "Time Ordering in Spontaneous Parametric Down-conversion". In QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC): The Tenth International Conference. AIP, 2011. http://dx.doi.org/10.1063/1.3630207.

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Chekhova, Maria. "Tiniest Sources of Spontaneous Parametric Down Conversion". In Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/nlo.2023.tu2b.1.

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Abstract (sommario):

Spontaneous parametric down-conversion in ultrathin films or metasurfaces has loose phasematching, providing enormous freedom for quantum state engineering. This includes tunable polarization entanglement, resonant enhancement of emission, controlled directivity, and generation of complex quantum states.

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Bashkansky, Mark, Igor Vurgaftman e J. Reintjes. "Significance of Heralding in Spontaneous Parametric Down-Conversion". In Laser Science. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/ls.2014.lth1i.3.

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Santiago-Cruz, Tomás, Zhang Haizhong, Aravind P. Anthur, Leonid Krivitsky e Maria V. Chekhova. "Fibre Spectroscopy of Nanoscale Spontaneous Parametric Down-Conversion". In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/cleopr.2020.c8g_4.

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Prabhakar, Shashi, Gangi Reddy, A. Aadhi, Ashok Kumar, G. K. Samanta e R. P. Singh. "Spatial distribution of Spontaneous Parametric Down-Converted Photons". In International Conference on Fibre Optics and Photonics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/photonics.2012.t1c.2.

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Rapporti di organizzazioni sul tema "Spontaneous Parametric Down Convertion":

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Catalano, Jesse. Spontaneous Parametric Down-Conversion and Quantum Entanglement. Portland State University Library, gennaio 2014. http://dx.doi.org/10.15760/honors.85.

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A STUDY OF COLLAPSE SUSCEPTIBILITY AND RESISTANCE OF LOADED CABLE-SUPPORTED PIPE STRUCTURE SUBJECT TO A SUDDEN BREAK OF CABLE MEMBER. The Hong Kong Institute of Steel Construction, settembre 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.7.

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Abstract (sommario):

Cable-supported pipe system (CSPS) provides a suitable system of structure for meeting the stringent structural requirements of pipeline bridges. However, due to a composite action of cable with truss and pipe members, the sudden failure of its structural member may lead to undesired vibratory response and collapse. The occurrence of a sudden break of the CSPS structural member is characterized by spontaneous dynamics and internal force rearrangement. The present study aims to investigate parametrically the collapse susceptibility and resistance of scaled down CSPS model in the event of a sudden break of the cable member by combined experimental and numerical procedures. The displacement of the structure, the pattern of internal force rearrangement, and dynamic responses were comparatively evaluated. Experimental results depict imminent cable failure under load and attendant dynamic response, but without a total collapse of the CSPS structure. Critical members causing large dynamic response amplitudes were identified and the mitigation of collapse was evaluated. Dynamic increasing factor (DIF) methods was utilized for the evaluation of the dynamic response of the sudden cable break resulting from the pattern of responses between the cable members and the rest of the CSPS structure. Comparison with provisions in other studies shows higher values DIF of the CSPS cable members which led to proposed evaluation using dynamic factor (DF). Thus, the dynamic factors for the sudden break of various cable members along the span and the errors were also estimated considering the parametric of design variables which will enable easy utilization during the structural process of CSPS.