Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"semiconductor quantum dot"”.
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Semiconductor quantum dot lasers.
Stimulated emission in semiconductor quantum dot (QD) laser structures is demonstrated. Red-emitting, self-assembled QDs of highly strained InAlAs were grown by molecular beam epitaxy on GaAs substrates. Carriers injected electrically from the doped regions of separate confinement heterostructures …
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Theory of Modulation Response of Semiconductor Quantum Dot Lasers
… a theory of modulation response of a semiconductor quantum dot (QD) laser is developed. The effect of the following factors on the modulation bandwidth of a QD laser is studied and the following results are obtained:<br /><br />1) Carrier capture delay from the optical confinement …
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Theoretical study of performance characteristics of semiconductor quantum dot lasers
… factors on the operating characteristics of a semiconductor quantum dot (QD) laser is studied. Specifically, the following topics are included in the dissertation: 1) Effect of carrier-density-dependent internal loss in the optical confinement layer (OCL) on the characteristic temperature. …
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Microwave techniques and applications for semiconductor quantum dot mode-locked lasers
Semiconductor mode-locked lasers (MLLs) are important as compact and cost-effective sources of picosecond or sub-picosecond optical pulses with moderate peak powers. They have potential use in various fields including optical interconnects for clock distribution at an inter-chip/intra-chip level as …
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Tuning the coherent electron-nuclear interaction in a semiconductor quantum dot
An electron hosted in a quantum dot (QD) provides a natural realization of the central spin system, as it interacts with the ∼ 10^5 nuclear spins that compose the quantum dot. Ideally, this system can be used to implement a multi-qubit register formed by collective excitations of the nuclei …
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Theoretical Study of Semiconductor Quantum Dot Lasers with Asymmetric Barrier Layers
Small-signal dynamic response of semiconductor quantum dot (QD) lasers with asymmetric barrier layers was studied. Semiconductor lasers are used in many communication systems. Fiber optic communication systems use semiconductor lasers in order to transmit information. DVD and Blu-ray disk players …
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The application of GHz bandwidth electrical pulses to a single semiconductor quantum dot.
Quantum dots contain several isolated two-level quantum systems, an ideal starting point for the creation of a qubit. A single quantum dot embedded within a chargetunable heterostructure can be optically isolated using confocal microscopy, and electrically manipulated using an applied voltage. This …
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Dynamic Acoustic Control of Semiconductor Quantum Dot-Based Devices for Quantum Light Generation
… series of devices for the generation of photonic quantum states based on self-assembled InAs quantum dots, which are among the most technologically mature candidates for practical quantum photonic applications due to their high internal quantum efficiency, narrow linewidth, tunability and …
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Decoherence In Quantum Dot Charge Qubits: The Role Of Electromagnetic Fluctuations
Lateral semiconductor quantum dot structures have been proposed as an effective quantum bit (qubit) for quantum computation. A single excess electron with the freedom to move between two capacitively coupled quantum dots creates a `pseudo'-spin system with the same qubit behavior as the more …
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Quantum dot gain-lever laser diode
Semiconductor quantum dot (QD) lasers are competitive candidates for many applications such as high-speed long-haul optical communication systems. This is due to their superior lasing characteristics (compared to conventional quantum well (QW) lasers) and also their potential for high differential …
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Linking confined electron spins through coherent light-matter interaction.
Electron spins confined to self-assembled quantum dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series of experiments, the work contributing to this dissertation examines some of the key criteria for constructing such a …
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A single ion inside a miniature cavity
… interaction between a single ion and a single semiconductor quantum dot. The newly developed apparatus stores a single Yb+ ion in a radio-frequency Paultrap. There the ion is overlapped in-situ with the field of a miniature Fabry-Perot cavity which is mounted on a 3D-translation stage. The key …
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Open quantum system theory from an information perspective
Theoretical investigations of open quantum systems have uncovered a wide variety of unique dynamical phenomena. For instance, current research in quantum information technology aims to control and utilize time-delayed system-reservoir interactions and phonon-induced dynamical dissipative processes …
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A Quantum Light Source for Quantum Information Applications in the Telecom C-Band
Semiconductor quantum dot (QD) quantum light sources have long been established as suitable candidates for many quantum information applications, due to the on-demand emission of highly pure and highly indistinguishable single and entangled photons. A key factor in the development of this …
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Environmental coupling in a quantum dot as a resource for quantum optics and spin control
A single spin confined to a semiconductor quantum dot is a system of significant interest for quantum information science, as a potential optically-addressable qubit. In many respects, a quantum dot behaves like a single atom with high quality single photon emission. By controlling the light-matter …
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Exchange and superexchange interactions in quantum dot systems
Semiconductor quantum dot systems offer a promising platform for quantum computation. And these quantum computation candidates are normally based on spin or charge properties of electrons. In these systems, we focus on quantum computation based on electron spins since these systems has good …
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Lanthanides and quantum dots : time-resolved laser spectroscopy of biochemical Förster Resonance Energy Transfer (FRET) systems
… Lanthanide (Ln) complexes, as well as semiconductor quantum dot nanocrystals (QD), possess unique photophysical properties that make them especially suitable for applied FRET. In this work the possibility of using QD as very efficient FRET acceptors in combination with Ln complexes as …
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Structural, electronic and optical properties of cadmium sulfide nanoparticles
… onset excitations are strong excitonic. The quantum-confinement effect in the lowest excitation is visible as the excitation energy decreases towards the bulk band gap with increasing particle size. Dangling bonds at unsaturated surface atoms introduce trapped surface states which lie below …