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Google Explains Quantum Computing
- Thread starter CommanderFrank
- Start date
Considering that we are decades away from a practical quantum gate theory computer, I doubt it.
The NSA likes to pretend they have a lot of computing power but in reality, they get their knowledge through thuggery and the use of violence to coerce people into handing stuff over to them, not through superior intellect or computing power.
The fundamental challenge with quantum physics is twofold :
1.Things at the quantum level behave differently than at the macro level. When you are talking about things the size of subatomic particles, the laws of physics are completely different.
2.It is impossible (as of right now anyway) to directly observe most quantum phenomena because of the Heisenberg Uncertainty Principle. Therefore, one must rely on math, rather than direct observation, to prove most quantum theories.
Quantum physics, however, is very much real and there is a high probability that you are using a computer that benefits from quantum phenomena that have been proven and applied to practical uses. One good example is flash memory which uses Fowler-Nordheim tunneling to store data.
The one aspect that of these theories that trows me off is the "same time being two things" logic.
It smacks if some old philosophy do explain the mind body problem; that is how does the soul interact with the body.
I follow the cat theory; my issue is once observed if must be dead or alive (0 or 1) but in quantum physics they seem to accept that uncertainty (though lack of observation, or being unable to see it) as a new state of being both at the same time.
But I have a hard time accepting that; because once it is observed it must be in the one of the two base states dead/alive 1/0 -- to me that means it was always in that binary state, the only thing that was uncertain was out knowledge of that state. How do we use our own lack of observation to do anything meaningful?
It almost seems like probability betting on a Ali v Tyson fight, only one can win, but we will never be able to observe said fight so the outcome will always be uncertain. But how does that type of speculation help computing?
It smacks if some old philosophy do explain the mind body problem; that is how does the soul interact with the body.
I follow the cat theory; my issue is once observed if must be dead or alive (0 or 1) but in quantum physics they seem to accept that uncertainty (though lack of observation, or being unable to see it) as a new state of being both at the same time.
But I have a hard time accepting that; because once it is observed it must be in the one of the two base states dead/alive 1/0 -- to me that means it was always in that binary state, the only thing that was uncertain was out knowledge of that state. How do we use our own lack of observation to do anything meaningful?
It almost seems like probability betting on a Ali v Tyson fight, only one can win, but we will never be able to observe said fight so the outcome will always be uncertain. But how does that type of speculation help computing?
I understand it's mathematics; my thing is it is mathematics based on not looking at the binary state of a bit.
In one of the videos (hopefully I get this right), given two bits there are four possible states, 00, 01, 10, and 11. these can all be represented by two qbits that can be any of these combos based on the uncertainty of what the states is until we measure it.
How computing with qbits different from working with a bad hard drive? I'm not certain what bit I am going to pull off the drive until I go to read it. It just seems that making calculations with mystery numbers (two qbits must be one binary number 0 though 3, but we are uncertain until we look it) how does that work in creating precise calculations for anything?
In one of the videos (hopefully I get this right), given two bits there are four possible states, 00, 01, 10, and 11. these can all be represented by two qbits that can be any of these combos based on the uncertainty of what the states is until we measure it.
How computing with qbits different from working with a bad hard drive? I'm not certain what bit I am going to pull off the drive until I go to read it. It just seems that making calculations with mystery numbers (two qbits must be one binary number 0 though 3, but we are uncertain until we look it) how does that work in creating precise calculations for anything?
maybe the computer will only be moody certain times of the month
Just don't look at it and it might be okay. maybe, but the probabilities are uncertain.
The funny thing is I used to understand some of the math, but lack of use means these days I don't. I gather they can perform matrix operations on the qubits that benefits from the superposition of states possible, then look at the result.
A bad hard drive just kinda sucks...there are no fancy operations to be performed with it.
A bad hard drive just kinda sucks...there are no fancy operations to be performed with it.
You are thinking in terms of classical computing. Quantum computers require a fundamentally different approach to algorithms and programming.
Let's say you are trying to crack an MD5 hash. You know that the MD5 hash represents a password that is, at most, 20 characters long. With a classical computer, if you wanted to break that hash, you would run an algorithm that would compute the MD5 hash of different strings, one at a time (excluding multiple cores or processors for simplicity's sake), by brute force, until you found a string that produced the same hash.
With a quantum computer, instead of trying to brute force things one at a time, one could simply encode every single possible answer (assuming sufficient qubits) into a quantum superposition. Remember that, with entangle qubits, each additional qubit increases the number of possible numbers that can be stored by 2^n where n represents the number of Qubits. Currently, the record for number of qubits on a quantum gate theory computer is 84 which allows for 19,342,813,113,834,066,795,298,816 possible combinations. And the number of Qubits will only increase with time.
It is true that, in normal circumstances, observing or measuring the values of a Qubit will produce essentially random results. However, once you have encoded all of the possible answers, it is possible to do something called amplitude amplification. Each time you iterate through the process, the probability of the value measured becoming a solution increases. After enough iterations, it is then possible to solve the problem and obtain the text the MD5 hash represents.