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 37 for “"Quantum Metrology"”.
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Quantum metrology with Bose-Einstein condensates
… precision and therefore form the basis of many metrology schemes. Research has shown that by using quantum states as inputs to interferometers, precisions better than anything possible classically can be achieved. Nevertheless, these states are difficult to produce and fragile to particle …
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Silicon Nanoelectronics for Quantum Metrology Standard and Cryogenic SBMOSFET
… that have important applications in the field of quantum electrical current metrology and quantum information processing. First, we implmeneted an extremely accurate gigahertz silicon-based single-electron(SE) pump for the redefinition of the International Standard unit for the electrical current, …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
The fields of quantum and nonlinear optics have given rise to a variety of nonclassical states of light that have been proven to surpass certain limitations set by classical physics. Namely, certain squeezed and entangled states have been shown to beat the shot-noise limit when making precision …
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Exploring Novel Quantum Physics Using Ytterbium-171 in An Optical Cavity
… thesis, I present the development of a cavity quantum electrodynamics (CQED) system using single or multiple ensembles of ytterbium-171 atoms and its use for quantum metrology and quantum information science investigations. We develop and study a unified theoretical framework that describes …
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Quantum Information Processing with Continuous Variables and Atomic Ensembles
Quantum information theory promises many advances in science and technology. This thesis presents three different results in quantum information theory. The first result addresses the theoretical foundations of quantum metrology. It is now well known that quantum-enhanced metrology promises …
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Learning in Quantum Mechanics
… thesis explores the interactions of learning and quantum mechanics. At its heart, learning consists of extracting information from data. We will consider two types of data; random and deterministic. When data is random, one usually tries to learn an approximation to a desired object, when it is …
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Quantum control of spin systems in diamond
… which behaves according to the principles of quantum mechanics is an essential task in order to fully harness the unique properties of quantum mechanics, such as superposition and entanglement, for practical applications. Leveraging the quantum nature of the system would enable, for example, …
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Quantum assisted sensing, simulation and control
… aims of improving and advancing techniques of quantum metrology, simulation and control. Towards this goal, we engineer novel devices for quantum sensing, particularly the measurement of rotations, magnetic fields, and single spins towards the reconstruction of single-molecule structures. We …
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STUDIES IN QUANTUM CONTROL AND QUANTUM INFORMATION
This thesis translates abstract concepts from quantum information theory into physical control protocols designed for cooling, error recovery, and quantum metrology. The physical platforms utilized in this work include qubits, quantum harmonic oscillators, and their composite systems. In the first …
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Comparison, optimization, and application of various spontaneous parametric downconversion sources of polarization-entangled photon pairs
As benchtop quantum information protocols become increasingly more advanced and the distances over which these experiments are performed become significantly longer, integrated optics provide a small, robust, and practical alternative to traditional bulk optics. Waveguide technology makes it …
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Quantum Resources in Quantum Technologies: From Quantum Optimization to Many-Body Physics
Significant progress has been made in quantum technologies over the past decade. Despite this success, a central question remains: to what extent quantum resources are being exploited. This question is crucial not only for benchmarking quantum systems but also to unlock their full potential. This …
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Multi-terminal Josephson effect
… a Josephson junction is an ubiquitous quantum device formed by a weak link between a pair of superconductors. In this work, we demonstrate the dc Josephson effect in mesoscopic junctions of more than two superconducting terminals. We report fabrication and characterization of the 3- and …
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Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
… precision measurement beyond the standard quantum limit imposed by the Heisenberg uncertainty principle. It has been widely adopted in research fields to achieve scientific breakthroughs from gravitational wave detection to biological microscopy enhancement. The generation of …
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Scaling up a quantum register of dark electronic spins in diamond
… 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 the environment of a Nitrogen-Vacancy (NV) center in diamond have only included spins directly …
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Using hyperentanglement for advanced quantum communication
"The field of quantum information science promises incredible enhancements in computing, metrology, simulation, and communication, but the challenge of creating, manipulating, and measuring the large quantum states has limited current implementations of such techniques. Such limitations affect …
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Quantised charge pumping in a perpendicular magnetic field
… second, kelvin, ampere, mole and candela. Quantum metrology aims to redefine these quantities in terms of fundamental constants of nature such as the Planck, A vogadro and Boltzmann constants. In the electrical domain, the quantum Hall effect and Josephson effect provide quantum standards …
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Unified treatment of light-induced effects for atomic ensemble in optical cavities
… an optical cavity and use these atoms to sense quantum signals. In particular, the limitation of using uncorrelated atoms for metrology is set by the standard quantum limit (SQL) which scales as 1 [square root of N where N is the atom number. The presense of the optical cavity is essential to …
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Coherent control of electron spins in diamond for quantum information science and quantum sensing
… electron spins in diamond for applications in quantum information processing and quantum sensing. Specifically, optically-detected magnetic resonance measurements are performed on quantum states of single and multiple electronic spins associated with nitrogen-vacancy centers and other …
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Ultrafast sources of entangled photons for quantum information processing
Recent advances in quantum information processing (QIP) have enabled practical applications of quantum mechanics in various fields such as cryptography, computation, and metrology. Most of these applications use photons as carriers of quantum information. Therefore, engineering the quantum state of …
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Dynamics of impurities and trapped Bose-Einstein Condensates
… for a wide variety of applications, ranging from quantum simulations to quantum metrology. In this thesis, we investigate designing the confinement of tightly trapped impurities in a BEC reservoir to study their dissipative dynamics, and to study non-equilibrium dynamics of BECs confined in a …
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