QUSWITCH
A Quantum Switch for Light
| Coordinatore | TECHNISCHE UNIVERSITAET WIEN
Organization address
address: Karlsplatz 13 contact info |
| Nazionalità Coordinatore | Austria [AT] |
| Totale costo | 242˙193 € |
| EC contributo | 242˙193 € |
| 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-2011-IEF |
| Funding Scheme | MC-IEF |
| Anno di inizio | 2012 |
| Periodo (anno-mese-giorno) | 2012-04-01 - 2014-03-31 |
Partecipanti
| # | ||||
|---|---|---|---|---|
| 1 |
TECHNISCHE UNIVERSITAET WIEN
Organization address
address: Karlsplatz 13 contact info |
AT (WIEN) | coordinator | 242˙193.40 |
Mappa
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Obiettivo del progetto (Objective)
'Optical switches are devices that allow rerouting an incident optical signal to different ports and play a vital part in fiber optic communication networks. The realization of future quantum networks and quantum communication applications require so-called quantum switches, which, in contrast to classical optical switches, have to be treated quantum mechanically. In particular, quantum switches can be prepared and operated in coherent superposition states.
We propose the experimental implementation of a fiber based quantum switch, for which the internal state of a single laser-cooled atom defines the output port of the incident light field. The key element of this proposal is a novel type of optical whispering-gallery-mode microresonator. It allows one to reach the regime of strong coupling, where a single atom is sufficient to drastically change the transmission properties of the resonator. The coupling of light into and out of this so-called bottle microresonator is realized with very low losses using tapered optical fibers. This fiber integration in conjunction with the extremely high optical quality of the resonator enables the realization of a highly efficient quantum switch with properties adequate for real applications.
In addition to its potential use in quantum communication, an intrinsic property of this quantum switch is that it allows one to efficiently generate matter-light entanglement as well as highly entangled multi-photon states as, e.g., Schrödinger cat states. This is interesting both from an applied and from a fundamental point of view because the number of entangled particles can easily be adjusted, thus allowing the quantitative study of the transition from the quantum mechanical behaviour of the switch to the classical regime.'
Introduzione (Teaser)
Much as a light switch controls current flow to a lighting device, an optical switch reroutes incident light. Novel quantum optical switches have rerouted single incident photons with implications for future photonics and quantum computing devices.