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 31 for “"Quantum correlations"”.
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Quantum correlations and thermal machines
Quantum mechanics has given us a new playground in which to experiment that boasts several unique features. In this thesis, we explore it in the context of thermodynamics: looking at what kind of thermal devices can be constructed and how quantum behaviour affects them. We consider three research …
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Quantum Correlations for Fundamental Tests and Quantum Communication
Quantum correlations arising from measurements on pairs of entangled particles are often referred to as the most non-classical feature of quantum mechanics. As such, they have found a role in many fundamental tests of quantum mechanics and most emerging applications in the field of quantum …
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Quantum correlations, quantum resource theories and exclusion game
This thesis addresses two topics in quantum information theory. The first topic is quantum correlations and quantum resource theory. The second is quantum communication theory. The first part summarizes an ongoing work about quantum correlations beyond entanglement and quantum resource theories. We …
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Quantum correlations and measurements in tri-partite quantum systems.
Correlations and entanglement in a chain of three oscillators A,B,C with nearest neighbour coupling is studied. Oscillators A,B and B,C are coupled but there is no direct coupling between oscillators A,C. Examples with initial factorizable states are considered, and the time evolution is …
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Characterization of quantum correlations in low-dimensional molecular magnetic systems
Progressos recentes em informação quântica têm demonstrado nossa capacidade de detectar e controlar as propriedades quânticas em materiais magnéticos moleculares. Nos últimos anos, foi demonstrado que estes materiais possuem correlações quânticas altamente estáveis contra perturbações externas como …
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Studying quantum correlations and multi-hadron states using high energy quasi-real photons
Physicists use particle accelerators to probe the fundamental structure of matter by colliding particles at energies sufficient to resolve sub-nuclear degrees of freedom. The resulting final states provide insight into the underlying dynamics of nature, enabling the discovery of new particles, the …
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Quantum nonlocality: an analysis of the implications of Bell's Theorem and quantum correlations for nonlocality.
… the EPR experiment (EPR) cannot reproduce the quantum correlations. Factorizability is motivated by various locality conditions. So to understand the nature of nonlocality in EPR, we first need to understand the conceptual relations between factorizability, these various locality conditions and …
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Light-induced many-body correlations in ultracold gases
… several methods to generate and probe the quantum correlations in ultracold gases using light. A high-finesse optical cavity is used to enhance the atom-light interaction and we can produce a variety of entangled states which can overcome the standard quantum limit. The quantum correlations …
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Bounding the Quantum and Classical Resources in Bell Experiments
Bell's theory of nonlocality in quantum mechanics allows for interesting correlations between separated parties. In this scenario, both parties share a quantum state and measure it to obtain a classical value. Through entanglement, the results of the measurement from one party can affect the …
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Measurement of the Strong Phase Delta (Kaon Pion) Through the Decay of Quantum-Correlated Neutral D-Anti-D Meson Pairs
We exploit quantum correlations in coherent D 0D0 pairs produced at the psi(3770) resonance to measure the strong phase difference deltaKpi between D0 → K+pi- and D 0 → K-pi+ decays. Using 818 pb-1 of e+e- collisions collected by the CLEO-c detector, we report a measurement of deltaKpi …
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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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Analysis of the neutral D-meson decay to a neutral kaon and two neutral pions
… Using three tag modes and correcting for quantum correlations we determine that the D0 to K0S PI0 PI0 branching ratio is 1.059% with a statistical uncertainty of 0.049% and a systematic uncertainty of 0.050%.
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Phase space methods in finite quantum systems.
Quantum systems with finite Hilbert space where position x and momentum p take values in Z(d) (integers modulo d) are considered. Symplectic tranformations S(2¿,Z(p)) in ¿-partite finite quantum systems are studied and constructed explicitly. Examples of applying such simple method is given for the …
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Squeezing the Quantum Noise of LIGO below the Standard Quantum Limit
… other noises. One of the noise sources is the quantum noise due to the quantum vacuum fluctuations of the light itself. Besides the light, the mirror also has quantum-mechanical features and experiences quantum back-actions when we probe it with light. Knowing the position of the mirror very …
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Quantum Resources in Quantum Technologies: From Quantum Optimization to Many-Body Physics
Significant progress has been made in quantum technologies over the past decade. Despite this success, a central question remains: to what extent quantum resources are being exploited. This question is crucial not only for benchmarking quantum systems but also to unlock their full potential. This …
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Super-quantum and quantum enhancements of two-sender channels
This thesis studies the consequences of 'super-quantum non-local correlations', which are hypothetical violations of Bell/CHSH inequalities that are stronger - more nonlocal - than quantum mechanics allows, yet weak enough to respect special relativity in prohibiting faster-than-light …
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Processing correlated quantum systems in the one-shot setting
The novel ways in which correlations may be encoded non-locally in quantum mechanics have led to the promise of new technologies. This, in turn, has led to the first attempts at the development of quantum networks. Nonetheless, our understanding of quantum correlations and the limits of how we may …
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An Indeterminacy-based Local Approach and Ontology for Quantum Theory
… scientific and philosophical issues with quantum theory (QT). First, I propose Environmental Determinacy-based Quantum Theory (EnDQT) and argue that contrary to the other well-known quantum theories, it has the great benefit of being a local, non-relational, and …
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