[@catchamber]

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1. Quantum communication and that stuff
What I mean with microchips using quantum mechanics to communicate is simple.

Quantum entanglement is a pair of particles- two particles- that are inexplicably connected. When Particle 1, P1, is in State A, SA, then Particle 2, P2, will be in State B, SB, which is an opposite state than SA. So if something causes P1-SA to become P1-SB, then P2-SB will instantly- regardless of distance or interference- become P2-SA. By using two sets of AT LEAST 3 or 4 dozen entangled pairs, you could make a microchip- likely a very, very complex one- that uses one group of paired particles to transmit to the other chip, and the other group that the opposite chip to transmit. This way, they can send and receive either simpler messages or very much larger packets of data. It's nothing too terribly complex. If anything, all the other types would be more complex, because all this is is controlling, recording, and changing the states of particles- a few simple little commands that translates into much more important things, like a letter.

https://en.wikipedia.org/wiki/Quantum_entanglement

2. Star brains & wormholes
I don't even know what this is. 
It's safe to say that quantum communication would be very difficult to achieve on a great big scale, especially because it'd be very delicate and might not hold up well. Perhaps we could place a minor restriction- that it's good for handling a decent flow of information, but the larger it gets, the more and more expensive it gets. As in, the more quantum entangled pairs via literal numbers, the more expensive it gets by exponential numbers. 1 entangled pair = 1 unit of large currency. 10 entangled pairs = 100 units of large currency. That sort of thing.

And no, I wasn't talking about wormholes or any of that. Hells, that'd be some extremely difficult research to be done, and then to stabilize it and use it?

3. Smashing physics.

Tbh, physics have never been solid. When it comes to nuclear and quantum mechanics, regular physics go out the window. Technically, the Electromagnetic drive- the EM Drive- shouldn't work, because it breaks a special law of particle physics, but it works anyways!

4. Warp graviton engine
o.0
Why not EM Drive on steroids?
Or ion drives
Or plasma
or antimatter?