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 46 for “"Quantum Information Theory"”.
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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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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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Multiple-user quantum information theory for optical communication channels
… i.e., when one transmitter is used to send information to more than one receiver. We show that when coherent-state encoding is employed in conjunction with coherent detection, the bosonic broadcast channel is equivalent to the classical degraded Gaussian broadcast channel whose capacity …
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Open quantum systems and applications to the quantum information theory
… the communication between remote systems through quantum fields, and (b) constructing a theoretical model for accurately describing the information transmission, which does not lead to a violation of causality. To this end, we studied the system of two localized detectors (oscillators) interacting …
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Topics in quantum information theory and quantum many-body physics
… two results relating to the intersection between quantum information theory and quantum many-body physics. The first pertains to quantum algorithms, where few computational problems are believed to exhibit exponential separation between quantum and classical performance. For those that are, …
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Generalized entanglement in quantum information theory : optimization free measures and faithful extraction protocols
By studying generalizations of entanglement to quantum resource theories,we will provide a continuous family of optimization free measures to quantify the resource in a system, for any theory whose set of free states is given by the image of an idempotent and unital quantum operation. With the help …
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Applications of coherent classical communication and the Schur transform to quantum information theory
Quantum mechanics has led not only to new physical theories, but also a new understanding of information and computation. Quantum information not only yields new methods for achieving classical tasks such as factoring and key distribution but also suggests a completely new set of quantum problems, …
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Convex Geometric Connections to Information Theory
… between convex geometry and both classical and quantum information theory. We introduce the mean width bodies and illustrate the geometric interpretation they provide for the relative entropy of cone measures of a convex body and its polar. We define relative entropy for convex bodies and its …
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Information-theoretic aspects of quantum channels
Quantum information theory is an important element of quantum computing and quantum communication systems. Whenever a quantum computer needs to send an output state to another party, or two parties need to establish quantum entanglement or secure keys via quantum communication, a quantum channel is …
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Quantum proof systems and entanglement theory
Quantum complexity theory is important from the point of view of not only theory of computation but also quantum information theory. In particular, quantum multi-prover interactive proof systems are defined based on complexity theory notions, while their characterization can be formulated using …
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On the capacity of the erasure channel and the construction of an [epsilon]-randomizing map
The quantum information theory is the counterpart of the classical information theory in quantum computation, and it has raised many questions regarding the transmission and security of the information in quantum computers. This thesis studies the efficiency of such processes and contributes to two …
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Quantum Algebraic Geometry Codes
Quantum error correction is an essential aspect of quantum information theory, providing protection for quantum states against noise and decoherence. This thesis investigates the construction of quantum error correction codes derived from classical algebraic geometry (AG) codes. We present two …
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Locally Adaptive Protocols for Quantum State Discrimination
… contributions to two rapidly developing fields: quantum information theory and machine learning. It has recently been demonstrated that reinforcement learning is an effective tool for a wide variety of tasks in quantum information theory, ranging from quantum error correction to quantum control …
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A study on complexity
This thesis explores quantum complexity for various quantum systems. Quantum complexity is a well defined quantity in quantum information theory that measures the difficulty of constructing a quantum state from a given reference state and so far, various methods within high energy physics …
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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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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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