NANOELECTRONOISE · Exploring entanglement by noise measurements in nanoelectronic devices
6РП — Действия „Мария Кюри“
- Период
- 2006-10-18 → 2008-10-17
- Финансиране от ЕС
- 184 021 €
- 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
Наноелектронни устройства с InAs наножици се използват за създаване и измерване на сплитани електрони от суперпроводници. Това помага за развитието на квантови компютри, базирани на спина на електрона.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - NANOELECTRONOISE (Exploring entanglement by noise measurements in nanoelectronic devices)
In order to achieve electron spin based quantum computer the demonstration of separated entangled electrons is an essential step. In the framework of this project, the possibility to create entangled mobile electrons from Cooper-pairs of a superconductor (S) was investigated. InAs nanowires (NWs) were chosen as a platform to fabricate superconductor - normal (N) beam splitter device. After the establishment of the handling of InAs NWs, NW based quantum dots were designed and studied. Giant fluctuation of the g-factor of the discrete electron states of the dots was observed. Ferromagnetic leads were connected to NWs and the injection of ferromagnetic correlation was shown, investigating the spin ½-Kondo effect. Furthermore, electric-gate-tuning of the orientation of a single electron spin was demonstrated. Combining these ingredients F-QDot-S-QDot-F beam splitter device was fabricated. Due to the high degree of tunability of the beam splitter, Crossed-Andreev reflection was successfully detected, when Cooper-pair-originated entangled electrons enter into the two normal arms of the beam splitter.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The measurements of the time dependent current fluctuations (noise) in mesoscopic devices represent a great tool to investigate electron correlations. This tool can give access to information, which is not contained in usual conductance measurements, such a s the effective charge of carriers or to distinguish the classical and quantum nature of chaotic scattering in cavities. It can also be used to test particle statistics. The fermionic/bosonic character leads to anti-bunching/bunching of the particles.The antibunching of the fermions is a consequence of the Pauli principle. If a fermionic beam splits into two partial ones, the fluctuations in the two partial beams are anticorrelated. A few years ago the host institute realized a fermionic analogon of the single-source Hanbury-Brown and amp;Twiss (HBT) experiment demonstrating that electrons anti-bunch as a consequence of their fermionic nature. However, bunching of electrons is possible, if for example electrons are paired in a spin singlet state, as realize d in conventional superconductors. This pairing would lead to positive correlations.The goal of this project is to `search for positive current cross-correlations due to the entanglement of electrons. We will focus on correlation originated from two different types of entanglement in multiterminal semiconducting nanostructures: Spin entanglement will be studied in superconductor-normal hybrid structures; a super-conducting (Nb) electrode will be used as an emitter of correlated electron pairs into a Y-shaped beam splitter constructed in 2-dimensional electron gas (2DEG). Entanglement based on the orbital degree of freedom will be probed in a two-source HBT-interferometer, which will be fabricated in 2DEG operating in the quantum Hall regime.These experiments help to understand and control the entangled mobile electrons, which is fundamental for the new field of quantum computation and communication in solid state environment.
Оригинален текст от CORDIS (на английски).
Участници
- UNIVERSITY OF BASEL · BASELКоординаторНиво градШвейцария
Връзки
Данни: CORDIS, © Европейски съюз