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 26 for “"spin coherence"”.
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Nuclear spin coherence times of HD trapped in solid parahydrogen matrices
… is an appealing host material for nuclear-spin spectroscopy and precision measurements, providing a weakly interacting environment for embedded molecules, and a high degree of magnetic purity. While previous studies have demonstrated the potential of doped solid-parahydrogen matrices for …
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Spin coherence and optical properties of alkali-metal atoms in solid parahydrogen
… There is active research in solid-state electron spin systems for these applications. Nitrogen-vacancy centers in diamond, phosphorus donors in silicon, and molecular nanomagnets are some of the leading examples of the latter case. In this thesis, I will discuss development of a system consisting …
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Optical and spin coherence properties of Rb atoms in solid neon for magnetic field sensing
… interest has emerged in solid-state electron spin systems for magnetic field sensing and imaging with nanoscale spatial resolution. The goal is to detect and resolve a single nuclear spin. A significant application for such a spatial resolution is the imaging of complex biological molecules. …
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Spin-coherence and -dephasing of donor and free conduction band electrons across the metal-insulator transition in Si:GaAs
… as a magnetization state. The emerging field of Spintronics is trying to combine the world of semiconductor electronics and magnetism to overcome disadvantagesof each part on its own. Furthermore, new phenomena and applications associated with them may arise. Although this dissertation deals only …
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Diamond nanophotonic devices for quantum information processing and sensing
… NVs and photons, difficulty of maintaining spin coherence times, and scalable techniques for fabrication of NV-photon networks. This thesis focuses on overcoming these challenges by fabricating diamond devices to improve the collection efficiency of NV photon emission, especially from the …
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State-selective imaging of single rubidium atoms in a solid neon matrix
The development of single-spin quantum sensors with nanoscale resolution would provide immense utility in the determination of molecular structure, with applications in fields such as biology and chemistry. This dissertation discusses our progress toward using rubidium atoms trapped in solid neon …
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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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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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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
Systems with strong spin-orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest …
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Scaling up a quantum register of dark electronic spins in diamond
Electronic spin defects in the environment of an optically-active spin can be used to increase the size and hence the performance of solid-state quantum registers, especially for applications in quantum metrology and quantum communication. Previous works on multi-qubit electronic-spin registers in …
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Chip-scale atomic magnetometer based on free-induction-decay
… us to monitor the free Larmor precession of the spin coherent Cs atoms by separating the pump and probe phases in the time domain. A single light pulse can sufficiently polarise the atomic sample;however, synchronous modulation of the light field actively drives the precession and maximises the …
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High-Sensitivity Nitrogen-Vacancy Center Magnetometry: from DC to GHz
… lattice. We also examine the behavior of the spin coherence timescales under increasing electron irradiation doses. We then construct an NV-ensemble magnetometer by implementing and expanding upon the best techniques used for diamond growth, microwave delivery, optical excitation and readout, …
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Statistical metrology and process control of quantum devices
… and store their quantum state as an electron spin that can subsequently be read out optically. For this process to work effectively, an efficient light-matter interaction must be achieved, which is difficult given the small interaction cross section of an atomic memory with the optical field. …
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Coherence and state engineering of an optically active central spin system
… study of many-body physics in a dense central spin system. It focuses on the development of both the highly coherent quantum-optical platform - a droplet-etched GaAs Quantum Dot (QD) - as well as the techniques to optically induce and probe the collective dynamics of its resident nuclear spin …
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Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors
In recent years, spin relaxation, injection, and manipulation in semiconductors have attracted considerable interest because of several potential applications in "spintronic" devices and the necessity to understand and control spin-based phenomena. In light of the growing interest in spin-related …
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High-fidelity microwave control of single-atom spin qubits in silicon
… demonstration of the full operation of single-spin qubits in Si. Our qubits consist of the electron and nuclear spins of a single phosphorus atom, implanted in a Si substrate, and controlled by a gated nanostructure. We describe an experimental setup tailored to minimise electron temperature …
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Group-IV Colour Centres in Diamond for Multi-Photon Entangled State Generation
… for their attractive optical properties, long spin coherence times and access to long lived nuclear memories. These properties put group-IV colour centres forward as an ideal platform to realise quantum communication and computing via the generation of highly entangled photonic states. In …
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Optical Control over Nuclear Spins
… A qubit system that simultaneously has long coherence time, fast operation, and large scalability is highly desirable. Particularly, nuclear spins have been considered as ideal quantum information carriers thanks to their exceptionally long coherence time exceeding minutes and even hours at …
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Optics-Based Quantum Information and Sensing Platforms Utilizing the Nitrogen-Vacancy Center in Diamond
… system with unique optical and spin properties. In particular, optical control and read-out of the spin state, combined with long spin coherence times, make it an attractive candidate for both high-sensitivity magnetometry and as a solid-state spin qubit for quantum information …
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Photon-mediated entanglement of electron spins in a dynamic solid-state environment
… dots can act as an interface between single spins and photons. They combine the flexibility and scalability of semiconductor systems with near-perfect two level systems, emitting highly coherent single photons. In potential quantum information processing architectures based upon optical …
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