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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 23 for “"Quantum channels"”.
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Discrimination of Quantum Channels
… and error rates for the task of binary quantum channel discrimination, where the main focus lies on proving optimal asymmetric error exponents (both asymptotically and non-asymptotically) for different variants of this problem. The task of binary quantum channel discrimination is to …
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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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Efficient analog communication over quantum channels.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1970. Sc.D.
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Extracting classical information from quantum states : fundamental limits, adaptive and finite-length measurements
… and efficient optical communication systems, quantum mechanics of information processing has become the key element in determining the fundamental limits of physical channels, and in designing quantum communication systems that approach those fundamental limits. To achieve higher data rates …
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On quantum randomness and quantum resources
… parts. The first part is on entanglement, quantum randomness, and complexity beyond scrambling. More explicitly, we study the Rényi entanglement entropies of quantum designs. The results lay the mathematical foundation for studying the hierarchy of complexities in between scrambling and …
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On the nature and decay of quantum relative entropy
… and information theory, entropy's use in quantum information extends to diverse topics including high-energy physics and operator algebras. Entropy can gauge the extent to which a quantum system departs from classicality, including by measuring entanglement and coherence, and in the form …
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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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Classical capacity of the free-space quantum-optical channel
… the limits to reliable communication rates over quantum channels has been the primary focus of many researchers over the past few decades. In the present work, the classical information carrying capacity of the free-space quantum optical channel has been studied thoroughly in both the far-field …
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Quantum detailed balance and duality
We develop quantum detailed balance on a finite-dimensional system in terms of elementary transitions, which are pure states on the composite space consisting of two copies of the system. This is in close analogy to detailed balance in classical mechanics described in terms of Markov chains. We …
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Multipartite Quantum Clock Synchronization Via Collective Symmetric States
This thesis investigates multipartite quantum clock synchronization (QCS) tasks using a class of quantum states, called collective symmetric (CS) states, which generalize Dicke and N00N states. Employment of CS states in previous QCS procedures is shown to improve synchronization performance in …
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Investigation of machine learning techniques in stabilization of co-propagating polarization encoded photons
Quantum communication protocols and networks have advanced considerably in experimental laboratories; however, their operation is frequently constrained by short time frames and significant environmental noise. These challenges affect both time-coded and polarization-encoded photon systems. …
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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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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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Solid-State Quantum Memories for Near-Term Quantum Repeaters
Over the past decade, quantum computers have emerged as a promising technology to enable transformational advances in information processing and communication and solve problems that are intractable to classical computers. While there is great promise in linking quantum computers together over long …
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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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On the exact renormalization of states in quantum field theories
… is a cornerstone of our modern understanding of quantum field theory and many body physics. As quantum information becomes an increasingly important tool in our understanding of continuum theories, new techniques are needed to understand how renormalization interacts with the strictly quantum …
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Quantum Cryptography Beyond Qubits
Over the last few decades, quantum cryptography has been one of the most important quantum technologies developed. It holds the promise of communicating secure information over untrusted channels. In particular, quantum cryptography is immune to the eventual threats posed by large-scale quantum …
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Accelerating Learning of Quantum Systems using Prior Information
Towards realizing practically useful quantum devices, the sizes of quantum devices are being scaled up. An imminent challenge to scalability is ensuring resource requirements of learning tasks that occur as part of device characterization and execution of quantum algorithms also scale favorably. …
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The Influence of Contact Transparency on the Superconducting Proximity Effect in Thin Semiconducting Films
… evaluated by calculating the number of available quantum channels between the two different Fermi surfaces and using the Landauer formalism to determine the ideal junction conductance. Comparison to the experimental junction conductance permits the discovery of the fundamental transmission …
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Detection and estimation of quantum channel capacities
This thesis investigates the subject of quantum channel capacities and is composed of two parts. 1. Detecting positive quantum capacities of quantum channels Determining whether a noisy quantum channel can be used to reliably transmit qubits at a non-zero rate is a challenging problem, since it …
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