Chinese scientists test quantum entanglement over unprecedented distance

A staple of sci-fi has been a pair of boxes with quantum entangled particles inside allowing FTL communications once the boxes travel (sub-FTL) to their destination.<p>By my understanding that&#x27;s impossible, although I always wondered if you could coordinate FTL, by detecting when a particle was no longer entangled.<p>Can someone with the background comment?

I thought quantum entanglement is the idea that two quantum particles separated by distance will behave the same at the same time regardless od distance.<p>Why is sending photons over distances a verification of quantum entanglement?<p>Can someone elaborate on what this is?

Wikipedia says:<p>&quot;<i>If Bohmian Mechanics as an non-local hidden variables interpretation of quantum mechanics is accurate it should allow quantum computers to implement a search of an N-item database at most in O ( N 3 ) {\displaystyle O({\sqrt[{3}]{N}})} steps. This is slightly faster than the O ( N ) O({\sqrt {N}}) steps taken by Grover&#x27;s algorithm using standard interpretations of quantum mechanics. Neither search method will allow quantum computers to solve NP-Complete problems in polynomial time.[4]</i>&quot;<p>I thought there was no way to figure out which interpretation of QM is correct. Can someone explain?

As a child I dreamt of having two futuristic walkie-talkies sharing several pairs of entangled particles making perfect instant communication across the galaxy possible. Later my physics teacher crushed my dreams by telling me it&#x27;s far from as easy as that and probably impossible due to Heisenberg&#x27;s ... (no clue what it&#x27;s called in English). It&#x27;s pretty awesome to hear that something <i>similar</i> is actively being worked on and seems possible, although being a huge challenge.

Note that while particles can be entangled, the special&#x2F;useful thing is the postponement of further entanglement (with the rest of the world).

The interesting part of &quot;quantum communications&quot; is the impact on security and surveillance. Does &quot;quantum communications&quot; even needs switches and routers? Backdoors don&#x27;t seem to be possible...

So if quantum entanglement does not enable FTL communication, what is it good for? How do you keep getting entangled particles from one place to another?

Could you use this for untraceable communication with hidden non-traceable submerged subs? That would be a military advantage.

we can use quantum tech to break the GFW firewall

Imagine being able to explore distant planets with robots and VR googles <i>in real time</i>!