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 20 of 57 for “"Single photons"”.
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Complete Temporal Characterization of Single Photons
… both the real and imaginary components of a single photon's temporal density matrix by measuring the autocorrelation function of the photocurrent from a balanced homodyne detector at multiple local oscillator frequencies. We lay the theoretical foundation for our work and describe the …
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Analysis of a Deterministic Entangled Photon Pair Source using Single Photons
… both with parametric down conversion source and single photon sources. We modify the latter scheme to implement it as an on demand entangled photon pair source and analyse its performance considering inefficient detectors, inefficient quantum memories and inefficient single photon sources. We …
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Indium arsenide quantum dots for single photons in the communications band
… epitaxial Indium Arsenide (InAs) quantum dots as single photon sources in the optical communications C-Band (Conventional Band; 1535 nm-1565 nm wavelength). First, the underlying theory of semiconductor quantum dots and the necessary tools from quantum optics are reviewed. Next, a detailed …
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Developing and Characterizing Sources of Quantum States of Light: from Single Photons to Million-Photon Fock States
… I demonstrate an improved characterization of single photon emitters (SPEs) in hexagonal boron nitride (hBN) at optical wavelengths. Specifically, I demonstrate how one can extract information about electron-phonon coupling in SPEs from photoluminescence spectra in order to characterize …
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Development of SiOxNy waveguides for integrated quantum photonics
… with a fidelity of 100 % using on-demand single photons from a quantum dot. This dissertation presents the first implementation of tunable Mach-Zehnder interferometers, which act on single photons, based on silicon oxynitride waveguides. Furthermore, for the first time silicon oxynitride …
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Spatial mode control and advanced methods for multi-platform quantum communication
… include channels which preserve the states of single photons over useful distances (e.g., using quantum repeaters), and must deploy quantum-safe cryptography to ensure the safety of classical information passing over the network. Here we discuss strategies affecting several areas of a future …
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Components for quantum computing based on optical transitions in single quantum dots
… and magnetic fields on the energy structure of single QDs, with a view to developing applications in the field of quantum computing. In the work presented here a novel method of creating entangled photon pair emitters is presented, in which an electric field is used to tune the energy structure …
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Quantum nonlinear optics: controlling few-photon interactions
… us can be explained by classical optics since photons interact weakly with atoms. When the interaction is strong enough where one photon affects the properties of other photons, we go to the regime of quantum photon-photon nonlinear optics. The work in this thesis explores this regime of …
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Optimized resources for efficient optical quantum information processing and sensing
… between two-photon quantum interference and single-photon classical interference in terms of measurement resolution and resilience against optical loss and background. We show how we can overcome these trade-offs by replacing conventional single photons with highly non-degenerate …
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Resonance fluorescence of novel quantum emitters
… towards coherently generated indistinguishable single photons and entangled photon pairs at telecom wavelengths. WSe2 monolayers are highly stable and are characterized by a higher extraction efficiency of photons compared to photon sources embedded in bulk materials. The experiments on confined …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
… by the Rayleigh diffraction limit. Additionally, single-photon sources and entangled photon pairs have given rise to provably secure quantum key distribution for cryptography. Producing these quantum states of light has proven a difficult task. Nonlinear crystals, when pumped by a laser, produce …
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Pure sources and efficient detectors for optical quantum information processing
… As inherently mobile quantum particles, photons are likely to play an important role in any mature large-scale quantum information processing system. However, the available methods for producing and detecting complex multi-photon states place practical limits on the feasibility of …
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Coherent photons from a solid-state artificial atom
Single spins confined in semiconductor quantum dots - artificial atoms in the solid-state - are attractive candidates for quantum mechanical bits, the fundamental units and building blocks of a quantum computer. The ability to address quantum dot spins optically allows us to initialise and …
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Quantum-confined excitons in 2-dimensional materials
… method by which we can deterministically create single-photon emitting sites in 2d-TMDs, in large-scale arrays. These we call quantum dots (QDs): quantum confinement potentials within semiconductor materials which can trap single-excitons. The single excitons recombine radiatively to emit …
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Towards ultrafast quantum processing: generation and storage of ultrafast photonic quantum states
… information theory. I motivate the use of single photons as the quantum particles of choice for this task, and I describe the open challenges facing the field of researchers embarking on this quest. This motivation pervades each subsequent chapter of this thesis, which focus in turn on …
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Site-controlled quantum dots as sources of quantum light
… of a pure, scalable and integrable source of photons with all the required properties. Epitaxial semiconductor quantum dots (QDs) have been exploited to deliver such quantum light, e.g. indistinguishable single-photons and polarization-entangled photon pairs, by both optical and electrical …
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SAW-driven single-photon sources and photon detectors fabricated on an undoped GaAs/AlGaAs quantum well
… on photonic qubits. Devices able to emit pure single-photon states on demand and detect incoming single photons in the system are fundamental building blocks for the realisation of a quantum photonic scheme. Advances in controlling single carriers have made it possible to transport single …
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Photonic quantum computers and communication systems
… -to combine the outputs of multiple stochastic single-photon sources using a photonic integrated circuit to generate an efficient source of single photons. We then show designs for silicon-based quantum photonic processors that can be programmed to implement a large class of existing quantum …
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High-dimensional quantum communication over deployed fiber
… relies on the transmission and detection of single photons to distribute the secret keys, but the secret-key generation rates are often limited by hardware, namely the ability to produce or detect nonclassical states of light. We address this challenge by using high-dimensional encoding to …
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Atomic quantum memory for photon polarization
… retrieval of quantum information in the form of single photons. We use a photon that has scattered into the cavity mode to herald a successful creation of a collective excitation of Cesium atoms and hence our ability to retrieve a photon from the stored excitation at a later time. Post-selecting …
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