Probing Two-Dimensional Quantum Fluids with Cavity Optomechanics - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Probing Two-Dimensional Quantum Fluids with Cavity Optomechanics write by Yauhen Sachkou. This book was released on 2020-07-17. Probing Two-Dimensional Quantum Fluids with Cavity Optomechanics available in PDF, EPUB and Kindle. Superfluid helium is a quantum liquid that exhibits a range of counter-intuitive phenomena such as frictionless flow. Quantized vortices are a particularly important feature of superfluid helium, and all superfluids, characterized by a circulation that can only take prescribed integer values. However, the strong interactions between atoms in superfluid helium prohibit quantitative theory of vortex behaviour. Experiments have similarly not been able to observe coherent vortex dynamics. This thesis resolves this challenge, bringing microphotonic techniques to bear on two-dimensional superfluid helium, observing coherent vortex dynamics for the first time, and achieving this on a silicon chip. This represents a major scientific contribution, as it opens the door not only to providing a better understanding of this esoteric quantum state of matter, but also to building new quantum technologies based upon it, and to understanding the dynamics of astrophysical superfluids such as those thought to exist in the core of neutron stars.
Transport and Turbulence in Quasi-Uniform and Versatile Bose-Einstein Condensates
Transport and Turbulence in Quasi-Uniform and Versatile Bose-Einstein Condensates - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Transport and Turbulence in Quasi-Uniform and Versatile Bose-Einstein Condensates write by Gauthier Guillaume. This book was released on 2020-09-26. Transport and Turbulence in Quasi-Uniform and Versatile Bose-Einstein Condensates available in PDF, EPUB and Kindle. Advancing the experimental study of superfluids relies on increasingly sophisticated techniques. We develop and demonstrate the loading of Bose-Einstein condensates (BECs) into nearly arbitrary trapping potentials, with a resolution improved by a factor of seven when compared to reported systems. These advanced control techniques have since been adopted by several cold atoms labs around the world. How this BEC system was used to study 2D superfluid dynamics is described. In particular, negative temperature vortex states in a two-dimensional quantum fluid were observed. These states were first predicted by Lars Onsager 70 years ago and have significance to 2D turbulence in quantum and classical fluids, long-range interacting systems, and defect dynamics in high-energy physics. These experiments have established dilute-gas BECs as the prototypical system for the experimental study of point vortices and their nonequilibrium dynamics. We also developed a new approach to superfluid circuitry based on classical acoustic circuits, demonstrating its conceptual and quantitative superiority over previous lumped-element models. This has established foundational principles of superfluid circuitry that will impact the design of future transport experiments and new generation quantum devices, such as atomtronics circuits and superfluid sensors.
Cavity Optomechanics in the Quantum Regime
Cavity Optomechanics in the Quantum Regime - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Cavity Optomechanics in the Quantum Regime write by Thierry Claude Marc Botter. This book was released on 2013. Cavity Optomechanics in the Quantum Regime available in PDF, EPUB and Kindle. An exciting scientific goal, common to many fields of research, is the development of ever-larger physical systems operating in the quantum regime. Relevant to this dissertation is the objective of preparing and observing a mechanical object in its motional quantum ground state. In order to sense the object's zero-point motion, the probe itself must have quantum-limited sensitivity. Cavity optomechanics, the interactions between light and a mechanical object inside an optical cavity, provides an elegant means to achieve the quantum regime. In this dissertation, I provide context to the successful cavity-based optical detection of the quantum-ground-state motion of atoms-based mechanical elements; mechanical elements, consisting of the collective center-of-mass (CM) motion of ultracold atomic ensembles and prepared inside a high-finesse Fabry-P'erot cavity, were dispersively probed with an average intracavity photon number as small as 0.1. I first show that cavity optomechanics emerges from the theory of cavity quantum electrodynamics when one takes into account the CM motion of one or many atoms within the cavity, and provide a simple theoretical framework to model optomechanical interactions. I then outline details regarding the apparatus and the experimental methods employed, highlighting certain fundamental aspects of optical detection along the way. Finally, I describe background information, both theoretical and experimental, to two published results on quantum cavity optomechanics that form the backbone of this dissertation. The first publication shows the observation of zero-point collective motion of several thousand atoms and quantum-limited measurement backaction on that observed motion. The second publication demonstrates that an array of near-ground-state collective atomic oscillators can be simultaneously prepared and probed, and that the motional state of one oscillator can be selectively addressed while preserving the near-zero-point motion of neighboring oscillators.
Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids
Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids write by A.F.G. Wyatt. This book was released on 1991-07-31. Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids available in PDF, EPUB and Kindle. Proceedings of a NATO ARW held in Exeter, UK, August 10--15, 1990
Physics of Quantum Fluids
Physics of Quantum Fluids - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Physics of Quantum Fluids write by Alberto Bramati. This book was released on 2013-07-11. Physics of Quantum Fluids available in PDF, EPUB and Kindle. The study of quantum fluids, stimulated by the discovery of superfluidity in liquid helium, has experienced renewed interest after the observation of Bose-Einstein condensation (BEC) in ultra-cold atomic gases and the observation a new type of quantum fluid with specific characteristics derived from its intrinsic out-of-equilibrium nature. The main objective of this book is to take a snapshot of the state-of-the-art of this fast moving field with a special emphasis on the hot topics and new trends. Bringing together the most active specialists of the two areas (atomic and polaritonic quantum fluids), we expect that this book will facilitate the exchange and the collaboration between these two communities working on subjects with very strong analogies.
