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BitcoinBarrel
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February 16, 2017, 05:40:22 PM
 #21

It's very simple, a value cannot be two values at the same time. This is a flawed idea from the start.



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bob123
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February 17, 2017, 11:42:43 AM
 #22

Hold your horses folks, Quantum Computing is Science-Fiction and NOT reality. Most likely will never exist.

Google made a simple quantum "computer" with three logic gates (well quantum gates in this case). While it does not compute anything, the outputs and inputs from the test rig confirms the theories on it. Might take a while but quantum computing is real.

This would probably take about 5-7 years until first real prototypes are available..
A solution to that problem can be found in this time easily.
But once it happened, todays crypthography can be thrown away.

vnvizow
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February 17, 2017, 03:20:00 PM
 #23

It's very simple, a value cannot be two values at the same time. This is a flawed idea from the start.
Prove all the scientists working on it wrong then, probably could make a name for yourself and that generic website.
AgentofCoin
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February 17, 2017, 08:15:45 PM
 #24

Quantum computing will be like the jump from 32 bit to 64 bit CPU's.

Except the advancement will be much bigger.

IMHO, it would be much more complicated than that, but I do not think it can even be possible, according to quantum mechanics, a physical system, whether a set of electrons orbiting an atom, is described by a wave function but there is the postulate that a measurement destroys the consistency of an unobserved state and inevitably after the measurement stays in an unpredictable mixed state,
starting from that fact the traditional computation is based on two predictable states 1 y 0 (absence or presence of voltage) which allows operations at low level, behavior of the particles it is sometimes unpredictable, or are subject to admit there are non-physical objects called "consciousness", so that being uncontrolled states can not be used because it would not be the expected result, the mere fact of trying to understand and manipulate these phenomena can be sanctioned by that consciousness, in the same way that the human being defines its rules and as far as another can do use of his creation or created things and sanctions to those who do not meet, in my opinion that is something that should be avoided.

My understanding is that consciousness has now been shown by experimentation
not to be a factor in the outcome. The observer can be a non-conscious system as
long as that system is designed for observation, like a powered up camera.
Consciousness has no effect on the outcome, it seems to be pure observation alone.

In theory, a non-conscious advanced robot that could "observe", could collapse the
wave, and in theory create outcomes unknowingly.

I support a decentralized & unregulatable ledger first, with safe scaling over time.
Request a signed message if you are associating with anyone claiming to be me.
nemgun
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February 18, 2017, 06:09:03 PM
 #25

Just in order to setup some informations for the people who thinks Quantum Computing is scify, have a look at this website : https://www.dwavesys.com/
It is Dwaves, with some millions of dollars, you can have your own quantum computer. I wonder why there isn't any altcoin who wants to buy one and use it to break bitcoin algo, or any other algo.

Even if it is hard to predict wether a quantum computer can or can't break the code, everyone knows that he have serious chances to do it.
By the way, Dwaves isn't the only manufacturer, there is annother one in china.


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BitcoinBarrel
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February 19, 2017, 08:55:06 PM
 #26

It's very simple, a value cannot be two values at the same time. This is a flawed idea from the start.
Prove all the scientists working on it wrong then, probably could make a name for yourself and that generic website.

Lol why would I invest time and energy in something I think is ridiculous?



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nemgun
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February 20, 2017, 05:13:38 PM
 #27

It's very simple, a value cannot be two values at the same time. This is a flawed idea from the start.
Prove all the scientists working on it wrong then, probably could make a name for yourself and that generic website.

Lol why would I invest time and energy in something I think is ridiculous?

If you have some millions $, we could do something to prove that bitcoin is superior to quantum computers, at least for now, because sooner or later they will be strong enough to break bitcoin double sha256.
But untill there, bitcoin is safe, do not believe the lies about wallet.dat been hacked, it is totally fake, anyone can generate fake informations in a unix terminal, they can even make a matrix-like screen, the package is "cmatrix" if you want to have it as a screen saver.


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Hydrogen
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February 26, 2017, 05:30:33 PM
 #28

I don't think there are true quantum computers.

Only quantum emulators.

A true quantum computer could probably break all existing encryption in seconds/minutes/hours.

Rather than months/years/decades.


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vnvizow
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February 27, 2017, 06:51:29 AM
 #29

I don't think there are true quantum computers.

Only quantum emulators.

A true quantum computer could probably break all existing encryption in seconds/minutes/hours.

Rather than months/years/decades.
It'll take a while before it gets to that, remember when regular computers take up stadium sized spaces because the logic gates are huuuge? That's where Quantum computers are at rn
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February 28, 2017, 08:28:50 PM
 #30

It'll take a while before it gets to that, remember when regular computers take up stadium sized spaces because the logic gates are huuuge? That's where Quantum computers are at rn

I'm not certain what the processing capability of a 1 QBIT CPU is.

It could be a lot. Even a basic quantum computer with 1 quantum bit could be groundbreaking technology.

 Smiley


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nemgun
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February 28, 2017, 08:41:42 PM
 #31

The links i sent you are about true quantum computers, not emulators, they work with close to subzero coolers. have a closer look at what they are offering.
There are also some shows in the informatics scene where companies from different countries shows their state of the art quantum computers.
For sure they are not miniaturized, and maybe this is why you think they are emulators, but i don't think you can emulate a quantum computer. Check also MIT quantum computer.


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Hydrogen
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February 28, 2017, 08:55:38 PM
 #32

The links i sent you are about true quantum computers, not emulators, they work with close to subzero coolers. have a closer look at what they are offering.
There are also some shows in the informatics scene where companies from different countries shows their state of the art quantum computers.
For sure they are not miniaturized, and maybe this is why you think they are emulators, but i don't think you can emulate a quantum computer. Check also MIT quantum computer.

As far as I know, the only difference between a quantum computer and an intel or amd CPU is the bit size of the registers.

An intel/amd x86 CPU is limited to binary bits. Its registers have 64 bits and each bit can only represent two binary values 0's and 1's.

A quantum computer has a bitsize larger than binary. Rather than being limited to 0's and 1's, its registers can hold greater values.

1 quantum bit could represent values from 0 to 1,000,000,000 or greater. This gives it a much higher base information density in comparison to existing CPU's.

Higher data density should translate to greater computational capacity.

There are a lot of emulators available which emulate the functionality of quantum bits on normal intel/amd hardware.

Search for "qubit emulator" there are a lot of them.

I think a true quantum computer should represent a big jump in computational capacity over existing architecture.

If there is no real technical advantage, its probably an emulator of some type.


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cmacwiz
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February 28, 2017, 09:09:17 PM
 #33

We're at the early working stages of quantum annealing computers, which are probabilistic. They isomorphically map a problem (map coloring maybe) to a quantum system (100 SQUIDS in an array), set initial conditions, then let the system relax into it's ground state (probably). This is not a universal quantum computer with logic gates acting on qubits.

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QRL
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The vault for blockchain transactions.


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May 02, 2017, 05:10:57 AM
 #34

So, I am happy to announce that www.theqrl.org The Quantum Resistant Ledger is working on this problem specifically. We also have our replies to a number of the questions and statements posed here within our medium publication https://medium.com/the-quantum-resistant-ledger.

A Discussion of Quantum Computing and Cryptocurrencies: https://medium.com/the-quantum-resistant-ledger/be-prepared-for-quantum-computing-era-bb1a9ec6cd35

In regards to the hard fork or changing of signature: https://medium.com/the-quantum-resistant-ledger/peter-waterland-2deed7bdbf65deed7b and https://medium.com/the-quantum-resistant-ledger/wouldnt-they-just-be-able-to-switch-to-some-hash-based-or-symmetric-cryptographic-algorithm-if-bdd99dfa03be

A basic risk and value assessment: https://medium.com/the-quantum-resistant-ledger/the-investment-thesis-for-a-quantum-resistant-ledger-9d335f8cf9ef

Our Solution: https://medium.com/the-quantum-resistant-ledger/seed-investment-strategy-pos-algorithm-updates-3b3854e83a4a

We would love your feedback on our assumptions and development.
fan_of_things_and_stuff
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June 05, 2017, 05:53:40 AM
 #35


I know, that all of todays cryptology (as we know it) will become obsolete once quantum computing is operative, because all keys can be cracked in minutes. I assume, that operative quantum computing is still some years away (beteen 5 and 20 years is my guess) but I would like to understand what the impact will be.

I guess its save to assume, that digital / crypto currencies will still be relevant. But how might the transiton look like? I am looking for thoughts on this questions:

1.) Can the SHA-256 algorythm in the bitcoin protocoll be replaced by some other (quantum computed) algorythm? Or is thsi part of the unchangeable bitcoin core? If it can be replaced - how would this be done and is someone working (researching) on this?


This is incorrect for a few reasons. Cryptology = Cryptography (the art of securing) + Cryptanalysis (the art of breaking), so if anything, I'm guessing what you mean to say is that quantum computers will break Cryptography.

Aside from that, quantum computing will only "break" asymmetric cryptography - the kind of crypto that uses one key to encrypt something, and another key to decrypt it. This is because current asymmetric crypto uses a really difficult (but not impossible) math problem to secure the message. Quantum computers will be able  (in theory) to solve that problem very quickly, removing the need for a key to decrypt it. See Shor's algorithm for details.

Symmetric crypto will be largely unaffected by quantum computing. Anything that uses a pre-shared key is going to be slightly less secure, but doubling whatever key size is currently being used (which for symmetric crypto is very easy) will bring you back to the same level of security you enjoy today. See Grover's algorithm for details.


2.) Is someone working (researching) on a quantum computing based cryptology approach? Who? Where?


Probably, dunno


3.) Would it be thinkable to have a smooth transiton between bitcoin and a follow up currency? Or will it be a "run for your life" thing, letting bitcoin exchange rate collapse?

Thanks for your input


This is an interesting question. TBH I'm not sure.  The hashing algorithms will probably have to be changes, and the addresses you use might need to be re-secured on a new public key system, but I'm not sure what would happen to the existing blockchain. Since each block (in BTC anyway) doesn't have a copy of current balances, there might be an issue.  Other blockchains store current state in every block, so maybe they avoid the issue of prior block tampering (maybe not, idk)


4.) Is it even possibel to develope a new currency before quantum computing is operative? Because once its here, bitcoin is not secure any more, but a new currency might not be available if development can not start without quantum computing being operative.


I would hope so. AFAIK there are no asymmetric systems that will be able to stand up to quantum computing, but presumably once there are it wouldn't be a big deal to develop a blockchain around it.  The hard part is developing the asymmetric system before quantum computing is able to catch up to our current crypto.

Hopefully that helps!
TechPriest
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June 05, 2017, 10:02:30 PM
 #36

Quantum Computing is Science Fiction and will never exist. Sorry.

Lol. Maybe people thought such things about ordinary computers (for us) 50 or 60 years ago.


Anything consensus related (hash algo, etc.) can be replaced via a hard fork. Hard forks require everyone to upgrade so they can be difficult to carry out.

Yeah, here is it - https://en.wikipedia.org/wiki/Post-quantum_cryptography . If somethings like that happens, bitcoin network can use one of theese algos.

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ppaul15
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June 08, 2017, 04:42:36 PM
 #37

Google made a straightforward quantum "PC" with three rational entryways (well quantum doors for this situation). While it doesn't figure anything, the yields and contributions from the test fix affirms the hypotheses on it. Might take a while however quantum computing is real
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