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 38 for “"Quantum Network"”.
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Towards a Quantum Network with Waveguide Quantum Electrodynamics
Over the past twenty years, the field of quantum computing has progressed from the investigation of individual quantum systems towards the implementation of manyqubit processors. Distributing information processing over a quantum network consisting of many nodes that communicate via itinerant …
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An Approach to Optimising the Design of a Repeaterless Global Quantum Network
A global quantum network will soon be possible, however investigations on its design are limited. Fibre-based optimisations focus on device placement. Cost analysis including nodes, fibres and usage of optical switching has been insufficiently explored. Satellite quantum key distribution is …
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Opportunities for U.S.-China scientific collaboration in building a bilateral quantum network
From advancements in time transfer to networked science, quantum networks can enable a new host of experiments that would not otherwise be achievable. We can learn a lot about building such a network to connect quantum resources globally through international cooperation. Toward this end, we argue …
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Dense Spin Arrays with Low Cross-talk Operations for Quantum Network Applications
In this master thesis, we propose a quantum repeater architecture based on a spin array with an efficient optical interface. Single qubit control and multi-qubit gates can be realized by localized electric field with low cross-talk and power consumption. This thesis will also contain how we use …
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The tin-vacancy centre in diamond: a coherent spin-photon interface for quantum network nodes
Quantum networks require spin-photon interfaces capable of generating entanglement between a stationary qubit and flying photons. So far, such an interface with a large emission rate of indistinguishable photons and excellent spin properties has been missing. Group IV colour centres in diamond …
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Protocols and Devices for Scalable Spin-Photon Quantum Networks
One of the central goals in quantum information science is constructing a quantum network useful for quantum communication, sensing, and computation. Its realization crucially depends on efficient distribution of entanglement. A promising approach entails connecting quantum nodes via photons, which …
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Distributed Entanglement in Deployable Quantum Networks
Quantum networks exhibit enhanced performance compared to their classical counterparts, enabling secure communication and enhanced sensing protocols. Scalable quantum networks must transmit photons over distances ranging from kilometers to metropolitan scales while preserving entanglement. The …
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Architectures for photon-mediated quantum information processing
In this thesis, I present architectures for quantum information processing where photons are used as the quantum bit (qubit) or for mediating entanglement between other qubits. The emphasis of this research is to simplify the basic building blocks required in such processors. The all-photonic …
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Lead-related quantum emitters in diamond
This thesis reports on quantum emission from Pb-related color centers in diamond following ion implantation and high temperature vacuum annealing. First-principles calculations predict a negatively-charged Pb-vacancy center in a split-vacancy configuration, with a zero-phonon transition around 2.3 …
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Processing correlated quantum systems in the one-shot setting
… which correlations may be encoded non-locally in quantum mechanics have led to the promise of new technologies. This, in turn, has led to the first attempts at the development of quantum networks. Nonetheless, our understanding of quantum correlations and the limits of how we may process them over …
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A tale of two interfaces: photons and spins linked by a solid-state artificial atom
An electron spin confined to a self-assembled quantum dot presents itself as a natural candidate for the node of a quantum network, offering a highly coherent interface between a solid-state spin and an optical photon. Crucial to the construction of such a network will be the exploitation of the …
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QKD and high-speed classical data hybrid metropolitan network
Quantum Key Distribution (QKD) is currently receiving much attention as it provides a secure source of encryption keys. Discrete-Variable QKD (DV-QKD) is possible for single photon transmission in QKD to-coexist with and encode classical wavelength division multiplexed (WDM) data with appropriate …
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Large-Scale Characterization of Quantum Emitters in High-Purity Diamond
Solid state quantum memories, such as color centers in diamond, are a leading platform for the distribution of quantum information. Quantum repeaters will require many qubit registers at every quantum network node, each with long-lived spin states and high-quality single photon emissions. Here, we …
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Developing the spin qubit of the tin-vacancy center in diamond for quantum networks
Quantum technologies working towards quantum computation and quantum communication have made tremendous progress over the past few years, highlighted by the 2019 "quantum supremacy" achievement demonstrating that quantum computers can realize calculations intractable to classical computers [5]. …
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Microwave and optical control of sub-diffraction spin qubits in diamond at cryogenic temperatures
… significantly closer to realizing a large scale quantum network, including the design and development of quantum computers. A central requirement for generating large-scale entanglement is a system that can be entangled at a rate faster than it decoheres. There are a variety of proposed protocols …
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Quantum dot-based Entangled-Light Emitting Diodes (E-LED) for quantum relays
… of photons can be used for encoding signals in quantum-encrypted communications, allowing a sender, Alice, and a receiver, Bob, to exchange keys without the possibility of eavesdropping. In fact, any quantum information system would require single and entangled photons to serve as qubits. For …
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Investigation of efficient spin-photon interfaces for the realisation of quantum networks
Quantum networks lie at the heart of distributed quantum computing and secure quantum communication - research areas that have seen a strong increase of interest over the last decade. Their basic architecture consist of stationary nodes composed of quantum processors which are linked via photonic …
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Towards optical quantum communication in space
"To build a global quantum communication network, low-transmission, fiber-based communication channels can be supplemented by using a free-space channel between a satellite and a ground station on Earth. To this end, we have developed a system that generates hyperentangled photonic ""ququarts'' and …
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Active flows and networks
… physical, biological, or information transport networks are driven by small-scale local energy input. In the first part of this thesis, we introduce and explore two analytically tractable nonlinear models for such active flow networks, drawing motivation from recent microfluidic experiments on …
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Atomic and molecular ions with photon resonators for quantum information science
… platform for the realization of fault-tolerant quantum information processing (QIP). Much progress with single atomic and molecular ion qubits has been made both in theory and experiment on the fundamental building blocks for scalable QIP architectures. Nonetheless, difficulty still remains for …
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