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 397 for “"Quantum information"”.
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Hyperentanglement for Quantum Information
"Finally, we explore experimental schemes to create two novel states, ""bound-entangled"" and CGLMP states. The former are mixed states from which pure entanglement cannot be distilled; in particular, we consider the Smolin state, which is a mixture of hyperentangled states. The latter states …
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Practicality of Quantum Information Processing
Quantum Information Processing (QIP) is expected to bring revolutionary enhancement to various technological areas. However, today's QIP applications are far from being practical. The problem involves both hardware issues, i.e., quantum devices are imperfect, and software issues, i.e., the …
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Precise control of quantum information
Theoretical discoveries in the nascent field of quantum information processing hold great promise, suggesting the means for increased computational power and unconditionally secure communications. To achieve these advances in practice, however, quantum information must be stored and manipulated …
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Coherent control of quantum information
Quantum computation requires the ability to efficiently control quantum information in the presence of noise. In this thesis, NMR quantum information processors (QIPs) are used to study noise processes that compromise coherent control, to develop useful techniques for detecting noise, and to …
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Coding theorems of quantum information theory
… theorems and (strong) converses for memoryless quantum communication channels and quantum sources are proved: for the quantum source the coding theorem is reviewed, and the strong converse proven. For classical information transmission via quantum channels we give a new proof of the coding …
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Distillation and simulation in quantum information
… tasks, i.e., distillation and simulation in quantum information theory. We investigate these tasks in a unified framework of resource theory and focus on their computation and characterization with finite resources. Particularly we study the tradeoff among relevant parameters such as the …
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Reservoir engineering for quantum information processing
This thesis concerns possible implementations of quantum computing schemes and tries to overcome some standard limitations. The central result is a technique we call reservoir engineering that is applied to optical cavity QED based quantum computing. The usual problem for quantum computing with …
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Conic Linear Programming in Quantum Information
A frequently studied problem in quantum resource theories (QRTs) is converting one resource state into another by applying free operations. If convexity arises in QRTs, convex analysis tools can be utilized in the analysis of these problems. The separating hyperplane theorem ensures the existence …
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Quantum information applications of frequency upconversion
… upconversion in a non-linear crystal for quantum information applications. By combining a bright “escort” beam with a signal photon inside of a periodically poled lithium niobate (PPLN) crystal, we are able to achieve near unit conversion efficiency. We use this conversion process to …
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Dynamical approach in quantum information theory
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Functional inequalities in quantum information theory
… studying various problems arising in classical information theory, statistics and many-body systems. Extensions of these tools to the noncommutative setting have been introduced in the beginning of the 90's in order to study the asymptotic properties of certain quantum Markovian evolutions. In …
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Quantum information processing in continuous time
Quantum mechanical computers can solve certain problems asymptotically faster than any classical computing device. Several fast quantum algorithms are known, but the nature of quantum speedup is not well understood, and inventing new quantum algorithms seems to be difficult. In this thesis, we …
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Experimental implementations of quantum information processing
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Quantum information and thermodynamics of general relativity
We treat an Unruh-DeWitt detector as an open quantum system, with a quantum field playing the role of the environment, and evaluate the response of a uniformly accelerated detector for different types of interaction between the detector and the field. We derive the evolution equations for the …
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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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Studies of Small Systems in Quantum Information
I study two topics in quantum information theory from the perspective of algebra and geometry. The first relates to exploring the geometry of unitary operators for small quantum systems, specifically three-level systems. Such an understanding of the space over which quantum systems evolve is …
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Learning with classical and quantum information constraints
… to design data-efficient algorithms under information restrictions. This thesis establishes a general framework for proving the fundamental limit of information-constrained learning and designs sample-optimal algorithms under settings of practical interest. We consider various information …
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Fermionic Quantum Information in Surface Acoustic Waves
Quantum computers are on the verge of revolutionising modern technology by providing scientists with unparalleled computational resources. With quantum-mechanical phenomena such as the superposition principle and entanglement, these computers could solve certain computational problems that are …
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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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