Quantum Complexity - Leonard Susskind
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- čas přidán 2. 06. 2018
- Lecture on quantum complexity and uncomplexity by Leonard Susskind given at the Kavli Institute for Theoretical Physics
Date: October 12, 2017
arxiv.org/pdf/1701.01107.pdf - Věda a technologie
![Leonard Susskind - Copenhagen vs Everett, and ER=EPR [2016]](http://i.ytimg.com/vi/LndrOIXG3i8/mqdefault.jpg)
Thank you for recording this lecture. He is so funny and keen on simplifying such a complex subject (no pun intended)
You are the great man. You deserve applause and all the good things.
A gifted teacher. Thanks.
😇 Say thanks to you for the helpful video, it is very much appreciated and I really value your hard work !👍
Lenny Susskind, making things uncomplex as he does ;)
Agreed, this man has made the incredibly complex world of advanced physics, generally understood by a total math moron, like me. I have enjoyed his talks for years and learned so much...the equations are lost on me, but his way of explaining them, somehow make sense to me.
Like his old friend, Feynam, Susskind, is as brilliant a teacher, as he is a physicists. My whole perception of reality, has drastically changed over the recent years, largely due to these 2 brilliant teachers.
Ever notice how some of the best teachers, have a well developed sense of humor...it seems all the "greats' in modern physic's had, and have, a natural ease with 'whimsy"...at least I have come to that conclusion.
Susskind version of high school thermodynamics: "Take two Hilbert spaces of N cubits..."
This made me laugh so hard dude.
qubit*
Thanks a lot sir its really a very simplistic explanation...
three shapes in contrast to compute a self referential 12 dimension equation. (2/3 +2/3) : (3/4 + 1/3) four parts of three in contrast with three parts of four with a remainder of one part of twelve. ( 4:3 )
Thankyou
Thankyou.
"Again, I can't prove this is the case. But also, Scott can't prove it either."
Hawking radiation must be when a quantum recurrence happens?
Don't start the clock yet...
wow it has been 5 years from this. Wonder whats the latest on this subject!
Strange he says time evolution by Scrodinger makes two states close to each other exponentially to diverge in gate complexity metric. If you slice the time evolution in discrete steps and consider each step as a gate, the you will get at step k no further than gate distance k from each other. Am I wrong?
It could be the case. But I think the point is you don't get to choose that gate. Paths are already defined randomly. As you let the states to evolve, they tend to get further apart.
You could insert a single gate to go from one state to any other, everything would have a complexity of 1. So inserting gates should not been allowed.
Therefore the question is: how probably is for two states to get closed again if the gates are always chosen randomly.
@@veteatomarporculo100 125one way 125 the other? Gee , beats me.
The complexity increase depends on the memory for the computation… small memory = small complexity. Complex computation is not possible without memory processing… future complex states, require preserved past/previous states. Keeping tye specific order of the states also requires a memory and is a state on its own… a lot s still missing. Universe is not computational the way we think…
Leonard Susskind should make paintings off the complexity and uncomplexity. He probably wouldn't want to be evolved with the art world though.
If laws of physics are reversible and we see irreversibility in nature then probably, irreversibility should be inherently there even in microscopic domain it might be that its signature are found when the system grows to mesoscopic or macroscopic scale. The laws accounting for irreversibility are diferent from as described using Schrodinger equation or quantum mechaincs. Complexity seems to be a good cadidate to account for this irreversibility and probably is not inheritable from quantum mechanics but something more deeper . ... Its probablly a roadmap to what is intelligence and ...its just that can we find a more generic way to motivate complexity independently of known laws of nature...
Isn't the Complexity circular polarization ?
Is there a reason to name it "uncomplexity" instead of "simplicity"?
Because it is not simple but rather the distance of the complexity of your system to its maximum possible complexity.
@Rainer Langlotz is right. In more common parlance, uncomplexity (Susskind's sense) implies you have room to get into a more complex state. Simplicity does not necessarily imply such room.
Complexity equilibrium = dark matter?
no...it's much more more significant. The Heat death of the universe is the universe at maximal entropy...so the maximal complexity, is the state of the universe in which, all states of the universe have been explored in every configuration...meaning it's something way beyond Heat Death...it's like experiencing the heat death of the universe in 2^N different possible ways.