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 13 of 13 for “"classical states"”.
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Quantum information processing with geometric phases, cavity magnonics, and semiconductor nanostructures
… behaviours, and the creation of non-classical states. Concerning coherent control, we examine the use of semiconductor-based nanostructures, notably electrostatically defined quantum dots in silicon-germanium heterostructures for quantum computing. By considering such a structure in …
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Quantum metrology with Bose-Einstein condensates
… 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 losses. Consequently, classical inputs, which are extremely …
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Quantum optical improvements in metrology, sensing, and lithography
… findings made in regards to using quantum states of light for remote sensing and imaging. We move on to Fabry-Perot interferometers in Chapter 4 and show discoveries made in the differences between classical and non-classical detection schemes with non-classical states of light. Lastly, in …
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Signatures of non-classicality in optomechanical systems
… (of the order of 10^15 atoms) into highly non-classical states. In particular we have shown new methods for preparing optomechani-cal pure states, squeezed states and entangled states. At the same time, proce-dures for experimentally detecting these quantum effects have been proposed. In …
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Nonadiabatic control of a superconducting qubit via strong driving
… up many calculations that are intractable on classical computers, including but not limited to factoring and the simulation of quantum mechanical systems. Quantum computation is achieved by replacing the bits of a classical computer with quoits. Qubits generalize bits by allowing not only the …
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Entangling the spatial properties of laser beams
The use of non-classical states of light, such as squeezed states, have allowed the exploration of quantum mechanical effects that had previously been the subject of speculation only. One of the more interesting aspects of quantum mechanics is when two objects become linked in a process known as …
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Entangling the spatial properties of laser beams
The use of non-classical states of light, such as squeezed states, have allowed the exploration of quantum mechanical effects that had previously been the subject of speculation only. One of the more interesting aspects of quantum mechanics is when two objects become linked in a process known as …
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Pure sources and efficient detectors for optical quantum information processing
Over the last sixty years, classical information theory has revolutionized the understanding of the nature of information, and how it can be quantified and manipulated. Quantum information processing extends these lessons to quantum systems, where the properties of intrinsic uncertainty and …
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Environmental coupling in a quantum dot as a resource for quantum optics and spin control
… a system, it is possible to generate highly non-classical states of light and coherently control a single spin confined to the quantum dot. A departure from the ideal atomic picture appears once we consider the mesoscopic environment with which the quantum dot interacts. Charge fluctuations in …
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Quantum discord, EPR steering and Bell-type correlations for secure CV quantum communications
Quantum states can be correlated in ways beyond what is possible for classical states. These correlations are considered as the main resource for quantum computation and communication tasks. In this thesis, I present my studies on the different forms of Quantum Correlations known as "Quantum …
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Quantum discord, EPR steering and Bell-type correlations for secure CV quantum communications
Quantum states can be correlated in ways beyond what is possible for classical states. These correlations are considered as the main resource for quantum computation and communication tasks. In this thesis, I present my studies on the different forms of Quantum Correlations known as "Quantum …
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Aspects of Quantum Coherence
… as understood to correspond with the non-classical behaviour that can be observed for certain particular states of a physical system. In particular we are interested in the possible mechanisms that result in dynamically induced transitions between quantum and classical regimes. The thesis …
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Robustness of Fixed Points of Quantum Processes
… of robustness of fixed points (or invariant states) of quantum processes. In the first part of the thesis, we address the following question: Given a quantum channel and a quantum state which is almost a fixed point of the channel, can we find a new channel and a new state, which are …