H2020Индивидуална стипендия2015–2017

RyM · Experimental Studies of Strongly Interacting Quantum Gases in an Optical Lattice

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2015-05-01 → 2017-04-30
Финансиране от ЕС: 159 461 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Квантовите газове в оптични решетки се анализират чрез техники с Ридбергови атоми за създаване на супертвърди фази и локализирани състояния. Резултатите помагат за развитието на теорията за квантовите системи и създаването на нови инструменти за симулация.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Experimental Studies of Strongly Interacting Quantum Gases in an Optical Lattice

During the action the research fellow has investigated various aspect of Rydberg dressing scheme in many-body systems and non-equilibrium quantum phenomena in a disordered system. The Rydberg dressing technique is essential in realizing a supersolid phase, and the fellow successfully demonstrates this experimental scheme in many-body systems. Furthermore, coherence in the dressed system is recently observed by collapse and revival dynamics. In the experiment, however, the researcher find out the lifetime of the system is significantly shorter than theoretical predictions, which could be attributed to a complex molecular spectrum in dressed system. After finding suitable parameter window that shows enough lifetime, experimental efforts towards the supersolid phase will be continued. Still, the experimental works provide a stepping stone to realize long-range interacting many-body system with Rydberg atoms. Furthermore, the fellow has observed a many-body localized phase in two-dimensional Bose gas. The many-body localization (MBL) is a new quantum phase in non-equilibrium state, where initial state memory persists for infinitely long time. The major findings in the experiments are as follows. followings are the main questions that we addressed in the experiments. 1) The observation MBL phase transition in two-dimensions 2) Evidence of diverging length scale near the critical disorder. Our findings show the many-body localization is not a theoretical artifact from numerical errors or finite size effect, but it exists in real system. Especially, we have studied the localized phase in two dimensions, where it is impossible to study with the current state-of-art numerical techniques. Thus, our results provide a guide to the development of MBL theory or new tools for simulating complex quantum dynamics.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Quantum gas systems have been recognized as quantum simulators that can directly compare theoretical models and experiments because of unprecedented experimental conditions. Here, we propose experimental studies on strongly interacting quantum gases in an optical lattice. The key ingredients of our research are the strong and long-range dipolar interactions from Rydberg excited states and two-component Bosonic atoms in optical lattices, which can simulate Heisenberg Hamiltonian. Rydberg atom, having a high principle quantum number, engages in strong interactions because of its large dipole matrix element. Since the dipolar interaction of the systems can be coherently controlled and manipulated by laser light, we will investigate novel ground states of many Rydberg systems and realize many-body fast quantum gates. In this proposal, we introduce a supersolid phase in Rydberg systems, where the dipolar interaction can be tailored to a soft-core potential by off-resonant coupling. Moreover, studying coherent excitation dynamics of many-body Rydberg atoms, fast quantum gates can be realized in optical lattices. Finally, we propose a direct measurement of spin correlation function of anisotropic Heisenberg Hamiltonian in optical lattices by adapting the Ramsey interferometric technique. Our research will extend the boundaries of atomic physics by demonstrating many-body quantum phenomena and offering a new systems to study quantum information science. Demonstration of supersolid will open a new chapter of superfluidity and can clarify long-debates about the existence of superflow in solid He-4. Moreover, our experimental techniques can be further developed to study more complex phenomena such as, spin liquid phase in Rydberg system and many-body localised state in disordered spin Hamiltonian. Through the successful demonstration of ground breaking experiments, the competitiveness of European Research Area will be increased.

Оригинален текст от CORDIS (на английски).

Участници

MAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV · MUNCHENКоординаторГермания