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.
Results
Showing 1 to 20 of 648 for “"entanglement"”.
-
Entanglement, topology, & renormalization
In this thesis we will explore entanglement of various subsystems in quantum field theory, and its uses for describing underlying structure of states. We begin this journey by focusing on topological quantum field theory in chapters 1 and 2. These chapters are based heavily upon the papers [1] and …
-
Entanglement and hall viscosity
This dissertation studies quantum entanglement in relation to the geometric response known as Hall viscosity. We begin by reviewing geometric response in the quantum Hall effect in comparison to its well-known electromagnetic response, Hall conductivity. We develop an understanding of momentum …
-
Local approach to quantum entanglement
Quantum entanglement is the key property that makes quantum information theory different from its classical counterpart and is also a valuable physical resource with massive potential for technological applications. However, our understanding of entanglement is still far from complete despite …
-
Quantum quench dynamics and entanglement
… emphasis on the time dependence of the quantum entanglement. We inspect the scaling of entanglement entropy (EE) to learn how correlation and entanglement built up in a quench. We begin with two local quench examples. In Chap. 2, we apply a local operator to the groundstate of the quantum …
-
Entanglement in gauge/ gravity duality
… studies that elucidate the relationship between entanglement in strongly coupled gauge theories and the geometry of their gravity duals. In the first, we find that in a certain class of time-dependent states which have a gravity dual in which a black hole forms, the entanglement entropy of large …
-
Topological materials and quantum entanglement
… of matter and applications of the concept of entanglement in understanding topological phases and their transitions. The first part will focus on a particular class of materials called topological crystalline insulators (TCI), which are bulk insulators with metallic boundary states protected …
-
Games, protocols, and quantum entanglement
Quantum entanglement has evolved from being "spooky action at a distance" to being a fundamental information-theoretic resource, extending the frontiers of what is possible in communications, computation, and cryptography. It gives rise to non-local correlations that can be harnessed to perform …
-
Distributed Entanglement in Deployable Quantum Networks
… to metropolitan scales while preserving entanglement. The objective of this thesis is to characterize the sources and switches of real-world deployed quantum networks, which require an intimate knowledge of nonlinear concepts and devices that drive these operating regimes. Importantly, …
-
Classification of entanglement in symmetric states
… quantum information science. In this thesis the entanglement of symmetric multipartite states is categorised, with a particular focus on the pure multi-qubit case and the geometric measure of entanglement. An essential tool for this analysis is the Majorana representation, a generalisation of the …
-
Complexity And Entanglement In Quantum Gravity
… applied to quantum gravity. We first study the entanglement structure of Euclidean path integral states in SU(2) Chern-Simons theory, where we elucidate a connection between topological entanglement and quantum mechanical entanglement. We prove that the topology of certain three-manifolds …
-
Entanglement in a Bipartite Gaussian State
To examine the loss of entanglement in a two-particle Gaussian system, we couple it to an environment and use the Non-Rotating Wave master equation to study the system's dynamics. We also present a derivation of this equation. We consider two di�fferent types of evolution. Under free evolution we …
-
Entanglement and control of quantum states
… fic problem concerning the characterization of entanglement between two quantum mechanical two-level systems. We consider the optimal decomposition of a two-qubit state into an en- tangled and a separable part,with maximal weight of the latter,and derive necessary and su fficient conditions for …
-
Entanglement entropy in integrable quantum systems
… In all but one publications, we compute the entanglement of various systems. Using the celebrated “replica trick” we compute the entanglement entropy of non unitary systems using integrable tools in continuum and discrete models. In particular, in the first article we generalise the method …
-
Photonic Entanglement for a Quantum Repeater
… QKD by providing a means to establish entanglement between distant users. The goal of this thesis has been to develop a source of entangled photon pairs that is suitable for quantum repeaters and then use it to test some of the fundamental building blocks of a quantum repeater : the …
-
Crosslinking and Entanglement Effects in Polybutadiene
… to investigate the effects of crosslinking and entanglements on segmental motion in polybutadiene. The temperature dependence of T(,1), the spin-lattice relaxation time, T(,2), the spin-spin relaxation time, and T(,1(,(rho))), the spin-lattice relaxation time in the rotating frame are reported …
-
Quantum proof systems and entanglement theory
… main resource in quantum information theory is entanglement, which can be considered as a monotonic decreasing quantity under LOCC maps. Indeed, any result in quantum proof systems can be translated to entanglement theory, and vice versa. In this thesis I mostly focus on quantum Merlin-Arthur …
-
The structure of many-body entanglement
… discuss the general spatial structure of quantum entanglement in local many-body systems. A central theme is the organizing power of the renormalization group for thinking about many-body entanglement. We argue that the coarse structure of entanglement across of wide variety of systems, from …
-
High dimensional spatial entanglement with photon pairs
… pairs that are created and on how their entanglement can be measured. We approach some of these questions both analytically and numerically. The work is divided in three parts. The first is an introductory part, that consists of three chapters in which we set the framework and give the …
-
Novel protocols for entanglement characterization and protection
L'abstract è presente nell'allegato / the abstract is in the attachment
Page 1 of 33