One-dimensional Bose-Einstein Condensates in Micro-traps - 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 One-dimensional Bose-Einstein Condensates in Micro-traps write by Stephan Wildermuth. This book was released on 2005. One-dimensional Bose-Einstein Condensates in Micro-traps available in PDF, EPUB and Kindle.
One-dimensional Bose-Einstein Condensates in Micro-traps
One-dimensional Bose-Einstein Condensates in Micro-traps - 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 One-dimensional Bose-Einstein Condensates in Micro-traps write by . This book was released on 2005. One-dimensional Bose-Einstein Condensates in Micro-traps available in PDF, EPUB and Kindle. A novel wire-based magneto-optical trap has been demonstrated which enables to collect up to 3x10^8 cold atoms close to the reflecting surface of an atom chip. These atoms are subsequently transferred to micro-traps generated by wires mounted on the atom chip and Bose-Einstein condensation has been achieved. The Bose-Einstein condensates (BECs) created in the micro-traps form in the one-dimensional Thomas-Fermi regime. The cross-over between three-dimensional and one-dimensional BECs has been investigated by monitoring the transverse size of the BEC after ballistic expansion. Good agreement to theory has been found. As an application, one-dimensional BECs have been used to implement a microscopic magnetic field sensor. This sensor enables field measurements in a region which is not accessible for today's state-of-the-art sensors. A field sensitivity of 4 nT at a spatial resolution of 3 micrometer has been demonstrated. To investigate the phase-properties of a one-dimensional BEC, coherent splitting of a one-dimensional BEC has been achieved and interferometry on an atom chip has been demonstrated.
Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential
Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential - 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 Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential write by Tarik Berrada. This book was released on 2015-12-17. Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential available in PDF, EPUB and Kindle. This thesis demonstrates a full Mach–Zehnder interferometer with interacting Bose–Einstein condensates confined on an atom chip. It relies on the coherent manipulation of atoms trapped in a magnetic double-well potential, for which the author developed a novel type of beam splitter. Particle-wave duality enables the construction of interferometers for matter waves, which complement optical interferometers in precision measurement devices, both for technological applications and fundamental tests. This requires the development of atom-optics analogues to beam splitters, phase shifters and recombiners. Particle interactions in the Bose–Einstein condensate lead to a nonlinearity, absent in photon optics. This is exploited to generate a non-classical state with reduced atom-number fluctuations inside the interferometer. This state is then used to study the interaction-induced dephasing of the quantum superposition. The resulting coherence times are found to be a factor of three longer than expected for coherent states, highlighting the potential of entanglement as a resource for quantum-enhanced metrology.
Non-equilibrium Dynamics of One-Dimensional Bose Gases
Non-equilibrium Dynamics of One-Dimensional Bose Gases - 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 Non-equilibrium Dynamics of One-Dimensional Bose Gases write by Tim Langen. This book was released on 2015-05-22. Non-equilibrium Dynamics of One-Dimensional Bose Gases available in PDF, EPUB and Kindle. This work presents a series of experiments with ultracold one-dimensional Bose gases, which establish said gases as an ideal model system for exploring a wide range of non-equilibrium phenomena. With the help of newly developed tools, like full distributions functions and phase correlation functions, the book reveals the emergence of thermal-like transient states, the light-cone-like emergence of thermal correlations and the observation of generalized thermodynamic ensembles. This points to a natural emergence of classical statistical properties from the microscopic unitary quantum evolution, and lays the groundwork for a universal framework of non-equilibrium physics. The thesis investigates a central question that is highly contested in quantum physics: how and to which extent does an isolated quantum many-body system relax? This question arises in many diverse areas of physics, and many of the open problems appear at vastly different energy, time and length scales, ranging from high-energy physics and cosmology to condensed matter and quantum information. A key challenge in attempting to answer this question is the scarcity of quantum many-body systems that are both well isolated from the environment and accessible for experimental study.
Non-equilibrium Dynamics of Tunnel-Coupled Superfluids
Non-equilibrium Dynamics of Tunnel-Coupled Superfluids - 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 Non-equilibrium Dynamics of Tunnel-Coupled Superfluids write by Marine Pigneur. This book was released on 2020-08-28. Non-equilibrium Dynamics of Tunnel-Coupled Superfluids available in PDF, EPUB and Kindle. The relaxation of isolated quantum many-body systems is a major unsolved problem of modern physics, which is connected to many fundamental questions. However, realizations of quantum many-body systems which are both well isolated from their environment and accessible to experimental study are scarce. In recent years, the field has experienced rapid progress, partly attributed to ultra-cold atoms. This book presents the experimental study of a relaxation phenomenon occurring in a one-dimensional bosonic Josephson junction. The system consists of two 1D quasi Bose-Einstein condensates of 87Rb, magnetically trapped on an atom chip. Using radio-frequency dressing, the author deforms a single harmonic trap, in which the atoms are initially condensed, into a double-well potential and realizes a splitting of the wave function. A large spatial separation and a tilt of the double-well enable the preparation of a broad variety of initial states by precisely adjusting the initial population and relative phase of the two wave packets, while preserving the phase coherence. By re-coupling the two wave packets, the author investigates tunneling regimes such as Josephson (plasma) oscillations and macroscopic quantum self-trapping. In both regimes, the tunneling dynamics exhibits a relaxation to a phase-locked equilibrium state contradicting theoretical predictions. The experimental results are supported with an empirical model that allows quantitative discussions according to various experimental parameters. These results illustrate how strongly the non-equilibrium dynamics differ from the equilibrium one, which is well described by thermodynamics and statistical physics.
