Old school QM thought entanglement was fragile turns out it isn't just hard to measure through the vibrational noise.
There is a big difference between fragile and hard to measure :-)
QM information can not be destroyed by any normal physical means we have been able to test, it only collapses (Decoherence) by observation.
You have to stop thinking of QM in normal physics ways it simply doesn't exist in that realm the ultra-cold etc are just needed to measure it.
For example to measure temperature for reporting on the news the thermometer is placed in a box to stop wind and rain etc affecting the reading. It's not that temperature exists only in the box it's just you need to isolate out other factors to get an accurate reading.
Infact we have lately found ways to test entanglement at room temperature and on macroscopic objects km's apart
http://phys.org/news/2012-03-crystals-linked-quantum-physics.htmlThe development of a camera like device capable of seeing QM and entanglement is also close to a reality
http://phys.org/news/2012-01-quantum-mechanics-naked-eye.html
