SCOPE · Spinor Bose-Einstein Condensates for many-particle entanglement
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2009-05-01 → 2011-04-30
- Финансиране от ЕС
- 173 969 €
- Участници
- 1
- Схема
- MC-IEF
Линиите свързват координатора с партньорите.
Накратко на български
Квантовите състояния на кондензати от Бозе-Айнщайн се изследват чрез създаване на сплитане между множество частици в натриеви атоми. Това помага да се разберат границата между квантовия и класическия свят и процесите, при които квантовите свойства изчезват.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Spinor Bose-Einstein Condensates for many-particle entanglement
Project context and objectives The 2001 Nobel Prize for Physics was awarded jointly to Eric A. Cornell, Wolfgang Ketterle and Carl E. Wieman 'for the achievement of Bose-Einstein condensation in dilute gases of alkali atoms, and for early fundamental studies of the properties of the condensates'. This realisation of degenerate bosonic gases made a system available to scientists in which extremely low temperatures can be reached in a relatively isolated environment. Bose-Einstein condensates are well-controlled, mesoscopic quantum objects that provide an ideal platform where central ideas in quantum mechanics, such as decoherence or the existence of a 'quantum-classical' boundary, can be tested. The unusual features of quantum mechanics can be probed by producing so-called entangled states and typically measuring correlations that are unexplainable using a purely classical theory. The goal of this project relates to experimentally producing such entangled states in spin 1 Bose-Einstein condensates, where three distinguishable Zeeman components with spin projection mF = 0, ±1 exist, to demonstrate the non-classical correlations built in these many-particle systems and how they undergo decoherence. Work performed The project made a decisive step in this direction by allowing the construction of an experimental apparatus that was able to produce spin-1 Sodium Bose-Einstein condensates. This required several experimental advances, such as developing a new Sodium atomic source, a new laser system for laser cooling and a new method for all-optical evaporation. In parallel, the robustness of entangled states and of their preparation methods to inelastic collisions or experimental imperfections were studied theoretically. Main results By producing entangled states (for instance, a twin Fock state with exactly half of the atoms in the +1 and -1 components) is realistic for mescoscopic samples, which contain between a few tens and a hundred atoms.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
Since the early days of quantum theory and even more since development of the field of quantum computation, it is well established that correlation and entanglement are fundamental in quantum mechanics and a remarkable effort is on the way to better understand these concepts, both from the theoretical and the experimental point of view. In this proposal a series of new experiments devoted to the study of quantum entanglement in a mesoscopic system are presented. All the proposed experiments will be carried out on a sample of sodium atoms cooled down to quantum degeneracy. In such a system, the spin dependent interaction gives rise to full many-body entanglement whose observation is the central theme of this proposal. Due to the antiferromagnetic character of this spin interaction in sodium, several quantum states can be engineered going from Shroedinger cats to fragmented Bose-Einstein condensates. Beside the intrinsic interest of observing these many-body states, the ability to access and manipulate them could shine new light on the ubiquitous phenomenon of decoherence. To be able to access such highly entangled states, which have never been observed in any domain of physics for a number of particle higher than ten, several technical obstacles have to be overcome. A first crucial point will be the reliable production of such mesoscopic samples and a matching ability to precisely count the number of particle. An important part of this proposal is the implementation of the required experimental techniques, many of them already tested in different environments, into a new experimental apparatus. In a wider perspective, highly entangled mesoscopic states can lead to groundbreaking developments in the field of quantum metrology since these states can overcome the so called quantum projection noise limit, a fundamental limit of conventional atomic interferometers.
Оригинален текст от CORDIS (на английски).
Участници
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisКоординаторФранция
Връзки
Данни: CORDIS, © Европейски съюз