CATINFO · Non-local mesoscopic cat states and quantum information
6РП — Действия „Мария Кюри“
- Период
- 2004-04-01 → 2006-03-31
- Финансиране от ЕС
- 149 670 €
- Участници
- 1
- Схема
- EIF
Линиите свързват координатора с партньорите. За проекти отпреди 2014 г. CORDIS не винаги дава точни координати. Тези точки са на ниво град или държава.
Накратко на български
Квантовите състояния на полета и атомите се изследват чрез нови свръхпроводящи кухини, което позволява например квантова телепортация на атомни състояния. Постигнатият дълъг живот на фотоните помага за по-доброто проследяване на еволюцията на многофотонни квантови състояния.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - CATINFO (Non-local mesoscopic cat states and quantum information)
Our project focused on building a completely new experiment using two microwave cavities. The use of two separate cavities will make it possible to manipulate field and atomic coherences over large distances (15 cm). A major achievement was the development and test of new superconducting cavities with long photon lifetimes in a geometry which allows us to maintain the atomic coherences during the passage through the apparatus. Using mirrors consisting of superpolished copper substrates coated with a thin layer of superconducting Nb, we obtained photon lifetimes of 100 ms - an improvement of two orders of magnitude with respect to the existing ones. The lifetimes were the longest ever seen in an open resonator worldwide and were far beyond our expectations. A lot of efforts were devoted to the planning, construction and assembly of the new setup. Many technical difficulties had to be overcome since the experiment has to be operated under vacuum at cryogenic temperatures, with very good shielding of magnetic stray fields. In order to match the cavity resonance to the atomic transition, the mechanical parts had to be manufactured and carefully put together with micrometer precision. Moreover, a computer control system had to be developed in order to realise complex experimental sequences and to simplify and to accelerate the data acquisition. Now, the setup is almost finished and has reached a state where very interesting experiments such as atomic state quantum teleportation or the realisation of non-local mesoscopic field states can be envisaged in the near future. Especially the photon lifetimes of 100 ms will allow fascinating experiments such as quantum non-demolition measurements to monitor the evolution of a many-photon quantum states in the cavity.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
We plan to build a new cavity QED self-up for fundamental tests of quantum effects and for the demonstration of quantum information processing functions. We will use circular Ryder atoms and super conducting cavities in the millimetre-wave domain. Both the atomic levels and the cavity modes have very long lifetimes. Their coherent coupling overwhelms dissipation. This makes it possible to realize complex entanglement sequences and to manipulate macroscopic quantum superpositions. This domain has already provided interesting experimental insights into quantum information techniques. We plan to extend the realm of these experiments much farther by entangling two separate cavities with a single atomic beam. The two independent field modes will be used for new and quantitative tests of the lecherous processes. They make it possible to realize unprecedented quantum states, entangled pairs of macroscopic objects (non local Schrödinger cat states). The study of these quantum states will lead to a deeper understanding of quantum on-locality, which is at the heart of the power of quantum information transmission (particularly with continuous variable approaches). We will also study the lecherous process for these macroscopic quantum superpositions. The lecherous dynamics will be investigated, for instance, through the determination of the complete two-mode Wagner distribution. This detailed understanding of lecherous is an essential point to assess the limits set by relaxation on quantum information processing and to learn how to fight it. This cavity QED set-up will also be used for quantum information processing. The two cavities and the ability to manipulate four or five atomic samples in an experiment allow realizing rather complex sequences. We will study the teleportation of an atomic quantum state. This could be the first realization of quantum teleportation with matter particles. We will also implement a quantum error correction code#
Оригинален текст от CORDIS (на английски).
Участници
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, DéLéGATION PARIS B · PARISКоординаторНиво градФранция
Връзки
Данни: CORDIS, © Европейски съюз