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Extending quantum communication to space environments would enable us to perform fundamental experiments on quantum physics as well as applications of quantum information at planetary and interplanetary scales. Here, we report on the first experimental study of the conditions for the implementation of the single-photon exchange between a satellite and an Earth-based station. We built an experiment that mimics a single photon source on a satellite, exploiting the telescope at the Matera Laser Ranging Observatory of the Italian Space Agency to detect the transmitted photons. Weak laser pulses, emitted by the ground-based station, are directed toward a satellite equipped with cube-corner retroreflectors. These reflect a small portion of the pulse, with an average of less-than-one photon per pulse directed to our receiver, as required for faint-pulse quantum communication. We were able to detect returns from satellite Ajisai, a low-Earth orbit geodetic satellite, whose orbit has a perigee height of 1485 km.

hello Jose! Interesting it was proposed to do the same with the ISS as part of the ACES experiment. I don't remember the paper but i can look if you're interested

If electronics are soft and rubbery, would they maybe also tolerate launch- or landing-related vibrations better? Could we pack things more robust? Probably things get too fluffy for space engineers?

Intelligence agencies are building up a Facebook-style databank of international terrorists in order to sift through it with complex computer programs aimed at identifying key figures and predicting terrorist attacks before they happen.

All we are is stardust.

What if heuristic algorithms (PSO, DE, ...) do not actually simulate flocking birds or school gish beahviour ?!

how many of the ACT members actually have a car? maybe we are trendsetters :-)

Single celled organisms may not be able to think, but they can act in remarkable ways

Interesting, but obviously something is wrong. How the big giants can remain still if the inner planets and the sun vanish at the same time !

Are constants really constants ?

That's very interesting. The algae can be used as an absorber of CO2. The problem is that in order to be efficient it has to cover a wide surface and needs water. Would it be possible to grow algaes in the clouds...? Do you know some plants that are capable of floating in the air ?

Yes. There are some epiphytic plants who do not have roots and remove CO2 and H2O from air. Oisin is doing some calculations on it.

José - I think that we might have a look and find out where are the exactly investing and how they spend the money ....

Cockroaches accept little robots that smell like cockroaches. Cockroaches like it dark. Cockroaches explore but stay with cockroaches once they meet. Even if they are robots. If robots like it bright, cockroaches go with them.

we have to get one of these flying pinguins!!! who knows more about this company? Tobias, these are the same ones that you had shown me I assume?

females are just more social, really??

Intersting 4 years UK joint project on abserving for 4 years the behavior of robots that are programmed to imitate each other somehow. kind of mirror neurons? who knows..

An overview is given on the field of the terahertz-frequency electromagnetic waves, their properties and emerging applications. Some widespread sources with their advantages and drawbacks are presented; an emphasis is placed on the parametric generation s

A number of biological models with interesting photonic properties are reviewed, such as butterfly wings or moth eyes.

Nigeria's space agency. And yes they are working with a European university, the obvious one for microsatellites, Surrey The official website is hard to read but here it is http://www.nasrda.org/

Ultrathin films of highly monodispersed luminescent Si nanoparticles are directly integrated on polycrystalline Si solar cells. The authors monitor the open-circuit voltage and the short circuit current. The results demonstrate that films of 1 nm blue lu