Are you saying that a faraday cage blocks the electromagnetic field?
If so, how can we be sure that it blocks the field, rather than just blocking disturbances in the field?
Nope if transfers the field around and area of spacetime the same process is being used to build cloaking devices use QM.
Cloaking devices are using the same trick as a faraday cage just on other QM properties not the EM and the faraday cage was never actually understood in it's day as to why it created and electromagnetic shield.
You can cloak any object based on a QM property by transferring that property out at one boundary and back again at the next effectively cloaking in between the two boundaries.
In short you can cloak any QM property but you can not cloak all simultaneously to make an area of nothing the laws of QM conservation stop that happening
Background:
http://phys.org/news107011336.htmlLight cloak:
http://www.sciencedaily.com/releases/2011/07/110727121651.htmMagnetic cloak:
http://www.wired.com/wiredscience/2011/09/magnetic-invisibility-cloak/Heat Cloak:
http://www.sciencedaily.com/releases/2012/03/120326133516.htmPlasmonic Cloak:
http://www.iopblog.org/scientists-create-freestanding-3d-cloak/Time cloak:
http://www.technewsworld.com/story/74116.html
