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 45 for “"Open quantum systems"”.
-
Controlling open quantum systems
… techniques) of new methods for controlling open quantum systems. First, methods that improve coherent control through the use of both strong control fields and detailed knowledge of the system's Hamiltonian are demonstrated. With the aid of numerical search methods, pulsed irradiation …
-
Control of open quantum systems
… techniques of new methods for controlling open quantum systems. First, methods that improve coherent control through the use of both strong control fields and detailed knowledge of the subsystem's Hamiltonian are demonstrated. With the aid of numerical search methods, pulsed irradiation …
-
TENSOR NETWORKS FOR OPEN QUANTUM SYSTEMS
Is it possible to efficiently simulate a quantum physical system on a classical computer? The computational resources needed to manipulate quantum many-body states typically scale exponentially in the number of their constituents, making the simulation very difficult or outright impossible even at …
-
Semiclassical hybrid dynamics for open quantum systems
… is extended in order to be capable of treating open quantum systems considering finite baths. The corresponding phenomena, i.e. decoherence and dissipation, are investigated for various scenarios.
-
Non-Markovian Dynamics of Open Quantum Systems
An open quantum system is a quantum system that interacts with some environment whose degrees of freedom have been coarse grained away. This model describes non-equilibrium processes more general than scattering-matrix formulations. Furthermore, the microscopically-derived environment provides a …
-
Quantum Coherence and Entanglement in Open Quantum Systems
… these mysteries in nature.</p> <p>Recently, quantum coherence and entanglement are believed to play a crucial role in such biological systems–avian compass and photosynthesis. Thus, nature might know more tricks to utilize quantum mechanics than humans. Studies on the mechanisms underlying …
-
Simulation, characterisation and control of open quantum systems dynamics
… characterisation, and control of the dynamics of open quantum systems. The latter are systems governed by quantum mechanical laws and interacting with an environment, which is typically much larger than the system itself. According to the standard approach, one is usually able to perform a …
-
Open quantum systems and applications to the quantum information theory
… and describing 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 …
-
Decoherence, Master Equation for Open Quantum Systems, and the Subordination Theory
… sheds light into the spectroscopy of blinking quantum dots. The system studied is a two-state system, interacting with an external environment that has the effect of establishing an interaction between the two states, via a coherence generating coupling, called inphasing. The collisions with …
-
Control of open quantum systems : a theoretical approach to control of surface Photochemistry
Das Thema dieser Arbeit war die Kontrolle offener Quantensysteme, wobei der Schwerpunkt auf photochemischen Oberflächenreaktionen lag. In dieser Arbeit wurde die Beschreibung offener Quantensysteme innerhalb der „Surrogate Hamiltonian“ Methode realisiert. Eine effiziente Methode zur Berechnung von …
-
Tensor network approaches to open quantum systems, higher dimensional lattices and random quantum circuits
This Dissertation was approved for publication on 2024-08-27 at 15:07.
-
COMBINING QUANTUM TRAJECTORIES AND TIME-DEPENDENT VARIATIONAL MONTE CARLO FOR MANY-BODY OPEN QUANTUM SYSTEMS
Simulating quantum systems is complex due to the “curse of dimensionality”, which is exacerbated in open quantum systems that interact with their environment. Indeed, tra- ditional computational methods struggle with the exponential growth of Hilbert space in these systems. This thesis introduces …
-
Open quantum system theory from an information perspective
Theoretical investigations of open quantum systems have uncovered a wide variety of unique dynamical phenomena. For instance, current research in quantum information technology aims to control and utilize time-delayed system-reservoir interactions and phonon-induced dynamical dissipative processes …
-
Flow of Entropy in Equilibrium and Non-Equilibrium Quantum Systems
… electrical work and the converse, in a range of systems that define the current and coming technological revolution, those of open quantum systems in and out of equilibrium. Simple and comprehensible formulas for global and local heat and entropy currents are proposed and interpreted through the …
-
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 …
-
WAVEPACKET APPROACHES TO DISSIPATIVE QUANTUM DYNAMICS
… arising in Chemistry, Physics and Biology show quantum effects. Representative examples are chemical reactions involving light atoms, energy transfer in complex environments, electronic and geometrical properties of complex and bulk systems, tunneling phenomena etc. Theoretical Chemistry deals …
-
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 …
-
Non-classical methods for the simulation and design of quantum materials.
… of material physics. However, the simulation of quantum materials (whose properties are fundamentally shaped by quantum mechanics) poses a significant challenge due to their intricate electronic structure and unique emergent phenomena, such as magnetism, topological states, and superconductivity. …
-
Computational investigation of light harvesting in purple photosynthetic bacteria
… the hierarchy equations of motion (HEOM) for open quantum systems, which does not rely on assumptions of relative interaction strengths and includes quantum coherence effects. An efficient implementation of the HEOM is developed and utilized to describe exciton dynamics in the light harvesting …
Page 1 of 3