I think that teleportation of photons is already being done. But they are massless particles.
Tullio

An interesting particle is the photon, especially when split for each half
manages to stay in communication with the other.

Yep Tullo is correct it is Qantum Entangled yes there spooky action but Einstein didn't believe it he said God doesn't throw dice

However resent experiment with Teleportion in Hawai proves it does happen and teleportation would invole 3 protons
Again you need to watch Professer Brain Green doco Fabric of the cosmos episode 3 Qantum Leap

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I've read that a quantum computer built by D-Wave of Canada (D-Wave 2) has proven to be 4000 times more efficient in solving the traveling salesman optimization problem than a Xeon-based PC. But it needs cryogenic equipment and it costs 6666 times more.
Tullio

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The traveling salesman problem is "solved" by tree pruning algorithms that promise that no better solution is worth the extra computer time. The best known method for this involves the Karmarkar method for linear programming problems(Actually he wanders around inside of the pivot points).

Can anyone explain what a quantum computer is, how it works and why it would be more efficient in solving this type of problem. In what sense is it more efficient (speed, time, number of calculations ?)

A true Qantum computer with 300 Qantum bits would have more processing power than all the computers on the planet

it unlike a digital silicon computer does not think In 0 , 1

0 being off 1 being on

it thinks in 0,1 and somewhere in between and it can do it at the same time

unlike a normal digital computer that can only do 1 calculation at a time

true Qantum computer would be able to for the perpose of explaining it would be

doing 3 calculations at the same time . I hope that explains it

my math is not that good but I think it's ,for a 300 Qantum bit machine is

3 to the power of 300 calculations at the same time

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I heard some time ago about a silicon chip that can also be on off and hrf on or hrf off depending on how you wish to put it

I believe it has been called the GOD chip not shore if the one Tullio is talking about is based on it

It is also called the digital analogue chip

[edit] if the one Tullio is talking about is based on the GOD chip I do not think it can do the calculations at the same time and therefore is not a true Qantum computer [edit]

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oh one more thing a true Qantum computer with 300 Qantum bits would be the size of a grain of sand

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It would need more space, but the basic idea of a quantum computer is that a qubit can have both values zero and one at the same time, so that a byte could have 2 exp 8 different values. This greatly amplifies the computing power of a quantum computer, but the real problem is that of extracting one from all possible results of a calculation. This is nothing but the measurement process in quantum mechanics, so quantum computers depend on the machinery of quantum mechanics. Quantum computing power is increased by the idea of entanglement between two separated measurements, so that measuring one value gives also the result of the other. As far as I know, this is only a theoretical possibility and has not been exploited by the D-Wave computers.
Quantum computing is employed also in quantum encryption method for secure transmission of cyphers, and this has had already practical applications, especially due to prof. Anton Zeilinger of Vienna University.
Tullio

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Tullio you watched the Brian Green Doco Qantum leap was he wrong in explaining it or did I get it Wrong based on that doco ?

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Tullio you watched the Brian Green Doco Qantum leap was he wrong in explaining it or did I get it Wrong based on that doco ?

I cannot remember what he said, but this is not an easy matter to explain since it is really an application of quantum mechanics and if you do not know it well enough you cannot really grasp what is being sought. I have studied quantum mechanics at the University of Trieste, and have also followed the lectures of prof. Seth Lloyd of Cambridge University on the Internet (www.qubit.org) but I am not sure I have understood it completely. Quantum mechanics is still an area of research after about eighty years and the search for quantum computers has brought to a better understanding of its features but also of some its problems,which are still discussed.
Tullio

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Ok . Thank you for answering me maybe William would be better if he watched the doco too as I find Quantum mechanics hard to understand as well and I have not studied it and only know what I have read or watched in documentary's

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A byte of eight binary bits now has 2 to the eighth power possible patterns (that is 256)

I understand that a Qubit has three states so a Qubit byte of 8 qubits would have 6561 possible patterns. So I say so what--how does that make it faster. Entanglement involves positive or negative spin --2 states. I don't see the qubit thing here.

There would have to be an explanation of how doing "Quantum Logic" is superior to doing Boolean Logic. And some explanation of how this could be done faster than todays logic circuits.

In the old days Neural Networks were supposed to be more powerful as well. I and others, I am sure, showed that this was no different from Boolean logic (for the neurons being proposed back 50 years ago)

maybe William would be better if he watched the doco too

You are probably right. But each time I try to dig into this subject i always come away with "Huh?".

I minored in Theoretical Physics for my master's degree but also had a disbelief about the Copenhagen folks and Schrodinger himself as well. I always got a queazy felling in my stomach when trying to swallow these ideas. Plus,

I am with Feynman who said "Anyone who thinks that they understand quantum mechanics--doesn't"

Going "quantum" allows the potential for nearly infinite compute capability in that in the quantum world, you can 'test' all possible solutions simultaneously. Sort of the ultimate in parallel computation...

The only problem is that there seems to be only one 'secret' machine ever sold to work quantum magic. There is also a theoretical problem in that if the Canadian quantum machine really did work, then the theory of holographic representation of physical state for our universe would be violated...


Whichever way, we would get some very 'interesting' results!

Looks like something for Dadio to draw up some designs for!! ;-)

Possibly a competition between a coupling of dog biscuits vs a really hot cup of tea?...


Keep searchin',
Martin

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See new freedom: Mageia Linux
Take a look for yourself: Linux Format
The Future is what We all make IT (GPLv3)

you can 'test' all possible solutions simultaneously.

That's implied by Feynman's interpretation in that all paths are traversed from A to B. I still don't see how that relates to logic or to a computer program that could make use of the stated fact.

Exactly how could all possible paths through a network be tested at once?

you can 'test' all possible solutions simultaneously.

That's implied by Feynman's interpretation in that all paths are traversed from A to B. I still don't see how that relates to logic or to a computer program that could make use of the stated fact.

Exactly how could all possible paths through a network be tested at once?

William you asked for Quantum computers to be explained so I and Tullio have done our best to do that so do yourself a faver please before commenting and watch Brian Greens program just because you don't understand it does not make it wrong .
You are like a lot of people that go to uni you become trained to not open your mind at things we do not yet fully understand the old black and white attitude

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As I said earlier, it is difficult to explain quantum computing in a message board. I suggest to any interested person to go to www.qubit.org, you can find courses and tutorials there.
A qubit can have 2 possible states, |0> and |1> It is in a linear combination of these states a|0> + b|1> until you make a measurement on it and collapse it on either |0> or |1>. a square plus b square = 1. This is standard quantum mechanics.
Tullio

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My understanding of what the quantum computer is all about is that it could
mimic the operation of the human brain, itself a quantum computer. Hence the
difference then between the quantum computer and that of a conventional computer
will be that you programme the conventional computer to carry out tasks but
with the quantum computer you actually have to educate it to do the same...as
you do with the human brain....anyone come across this aspect regarding the
quantum computer/human brain relationship?

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The Kite Fliers

--------------------
Kite fliers: An imaginary club of solo members, those who don't yet
belong to a formal team so "fly their own kites" - as the saying goes.

My understanding of what the quantum computer is all about is that it could
mimic the operation of the human brain, itself a quantum computer. Hence the
difference then between the quantum computer and that of a conventional computer
will be that you programme the conventional computer to carry out tasks but
with the quantum computer you actually have to educate it to do the same...as
you do with the human brain....anyone come across this aspect regarding the
quantum computer/human brain relationship?

Yes Nick I read a article a long time ago about the brain being a Quantum computer but it was a while ago so I can't be shore of all the facts it said .It was a study of neurons on the atomic scale.

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Yes Nick I read a article a long time ago about the brain being a Quantum computer but it was a while ago so I can't be shore of all the facts it said .It was a study of neurons on the atomic scale.

Possibly Glen there may be two lines of research/development with reference to
quantum computers. One down the conventional lines in line with conventional
computer technology but much-much more advanced. The other line following the
development of cell like structures, kind of neurocell in nature, that will be
used inside this quantum computer. Like you, I came across this article many
years ago...I think it may have appeared in the New Scientist magazine.
The article went on to say that once developed this computer would be able to
operate a robot that would be capable of virtually mimicking a human in operation.
It may all seed a bit scifi but actually no....all the bits are there, scientist's
just have to put them all together which as we know they are really good at
doing, eventually.

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The Kite Fliers

--------------------
Kite fliers: An imaginary club of solo members, those who don't yet
belong to a formal team so "fly their own kites" - as the saying goes.

My understanding of what the quantum computer is all about is that it could
mimic the operation of the human brain, itself a quantum computer. Hence the
difference then between the quantum computer and that of a conventional computer
will be that you programme the conventional computer to carry out tasks but
with the quantum computer you actually have to educate it to do the same...as
you do with the human brain....anyone come across this aspect regarding the
quantum computer/human brain relationship?

Read "The emperor's new mind" and "Shadows of the mind" by prof.Roger Penrose of Oxford University. The first is easier, the second requires some understanding of quantum mechanics.
Tullio

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