QUANTUMDOTS
Experimental generation of distant quantum dot spin entanglement
| Coordinatore | EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZURICH
Organization address
address: Raemistrasse 101 contact info |
| Nazionalità Coordinatore | Switzerland [CH] |
| Totale costo | 187˙028 € |
| EC contributo | 187˙028 € |
| Programma | FP7-PEOPLE
Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013) |
| Code Call | FP7-PEOPLE-2010-IIF |
| Funding Scheme | MC-IIF |
| Anno di inizio | 2011 |
| Periodo (anno-mese-giorno) | 2011-07-01 - 2013-06-30 |
Partecipanti
| # | ||||
|---|---|---|---|---|
| 1 |
EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZURICH
Organization address
address: Raemistrasse 101 contact info |
CH (ZUERICH) | coordinator | 187˙028.80 |
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Obiettivo del progetto (Objective)
'Quantum dot spins, known as “artificial atoms”, not only provide platforms for studying spin dynamics in a solid-state environment, but also serve as promising candidates for implementing scalable quantum computation. Considerate efforts have been devoted to manipulating quantum dot spins as qubits. Precise preparation of initial qubits and complete control of a single quantum spin with optical means have been reported. Until now, however, the generation of distant quantum dot spin entanglement still remains challenging. Here, we propose to prepare quantum dot spin entangled states by making the photons from two distant quantum dots interfering on a wave-guide beam splitter, which is out of reach of all previous experiments. We also plan to study problems of fundamental importance in quantum mechanics, such as entanglement swapping, entanglement purification and testing of Bell inequality with quantum dot spins.'
Introduzione (Teaser)
To create a quantum computer, scientists believe it will be necessary to combine or connect stationary quantum bits (qubits) with mobile or 'flying' qubits.
Descrizione progetto (Article)
The 'Experimental generation of distant quantum dot spin entanglement' (QUANTUMDOTS) project used quantum dots to represent stationary particles as well as photons, particles that fly. A propagating photon can be used for the transmission of quantum information and a stationary qubit for storage and manipulation. To connect them, the researchers relied on entanglement between a pair of particles and the properties they share.
Broadly speaking, as a pair of particles shares characteristics, altering one changes the other. The QUANTUMDOTS researchers used a very small region of a semiconductor to trap a single electron and create a so-called quantum dot. Considered to be an artificial atom, the dot trapped electrons and possessed a spectrum of discrete energies.
Specifically, laser light of wavelengths stimulated the quantum dot to spontaneously emit a photon and return to its lower state. The photon was released as either horizontally or vertically polarised with a wavelength that was demonstrated to be of either a red or blue colour.
However, to use the information from a spin qubit, only one of the two properties can exist; the other must be removed. The QUANTUMDOTS researchers' removed the colour by runningthe photon through a crystal that was also shot with a laser beam. The colour smeared enough to consider this property removed from the entangled particles, opening the way for coupling distant qubits.
The QUANTUMDOTS researchers described the process and results in papers they have published in the Nature and Nature Communications magazine. It is hoped that the spin-photon entanglement will be key enabling technology for a distributed approach to quantum information processing and new computing devices.