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Author Topic: Quantum computer?  (Read 6284 times)
Realpra
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December 12, 2015, 11:14:47 AM
 #21

Biggest quantum computer yet was able to figure out that 3 and 5 multiplied gave 15.

I think we will be ok the next 20 years or more Wink


(The 500 qbit computer was a dud, the scientist who discovered the principle behind it, said it did not apply to their solution aka. a big paper weight and no results)

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There are several different types of Bitcoin clients. The most secure are full nodes like Bitcoin Core, but full nodes are more resource-heavy, and they must do a lengthy initial syncing process. As a result, lightweight clients with somewhat less security are commonly used.
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Yakamoto
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December 13, 2015, 05:11:12 AM
 #22

Biggest quantum computer yet was able to figure out that 3 and 5 multiplied gave 15.

I think we will be ok the next 20 years or more Wink


(The 500 qbit computer was a dud, the scientist who discovered the principle behind it, said it did not apply to their solution aka. a big paper weight and no results)
Well I wouldn't necessarily say we'll be fine for the next 20 years, but I can be fairly sure we won't have any issues with Quantum computers for at least another decade.

It's kind of a shame the 500 qbit was a dud, I was hoping that they would be able to usher in a new era of computing soon. But at the same time it does have its own issues, so maybe it is better that it hasn't worked yet.
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December 13, 2015, 05:43:59 AM
 #23

i think your Quantum Computer should neaeds 51% of the btcnetwork which is quit impossible..
Simply the google Somputers arent fast enough for thoose tasks.

Anyways why you want to sabotage it. Thats not so good idea i think Wink

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December 13, 2015, 10:26:18 AM
 #24

https://en.bitcoin.it/wiki/Myths#Quantum_computers_would_break_Bitcoin.27s_security
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December 13, 2015, 10:29:52 AM
 #25

Biggest quantum computer yet was able to figure out that 3 and 5 multiplied gave 15.

Actually, it was able to figure out the inverse operation. (15 is produced by which multiplication? Ah, it is 3*5.)  Wink
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December 13, 2015, 11:26:35 AM
 #26

Haven't found much on the topic there, so asking away.

Let's say i have a practicable quantum computer or other device capable of rapid factorization of large enough integers.
What are the consequences to a developed bitcoin network?
Any way it could let me cheat in generation?
Any way it would let me cheat in transactions?

With a device of this kind i can get the private key from public key, right?
So after receiving a bitcoin from someone, can i subsequently successfully fake a transfer of all there was on his side?

Actually the usefulness of all these odd features of quantum computing. Well, thanks to those quantum mechanical quirks, a quantum computer could crunch complicated calculations much quicker than the fastest computers today. Because the qubit exists in a superposition of one and zero, rather than one or the other, it can use ones, zeroes, and the superposition of both. By being able to encode multiple possibilities in its fundamental units and It can tackle the problem more efficient than Normal computer.
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December 14, 2015, 07:23:10 PM
 #27

This is not sci-fi anymore. Nasa and Google revealed their first Quantum computer that is 100,000,000 times faster than traditional ones. http://www.pcworld.com/article/3013214/hardware/nasa-google-reveal-quantum-computing-leap.html

Sorry to disabuse you, but the DWAVE technology is not a general purpose quantum computer and can not be used to "break" public key cryptography.  And even if it could be, there wouldn't be any 100M speedup, because that number is from a rigged "benchmark".
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