How close are practical quantum computers really?

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Anaxagoras
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How close are practical quantum computers really?

Post by Anaxagoras » Fri Apr 13, 2012 3:53 am

Why the age of quantum computing is nearer than you think
Tech-buffs, investors, IT industrialists, and boffins alike eagerly await the day when the science of quantum computing yields practical technology. Physicists of the Max Planck Institute of Quantum Optics (MPQ), recently published research that, they believe, has brought that pivotal day closer.

For many years, physicists have sought to create an information network far superior to today's by exploiting quantum phenomena. The team of German researchers have constructed the first vital component of such a network: a link between two atomic nodes over which information can be received, sent, and stored using a single photon. Successful exchanges of information recently took place in Garching, Germany, between two MPQ labs connected by a 60-meter fiber-optic cable. Though only a prototype, this rudimentary network could be scaled up to more complex and distanced quantum networks. The team reports their research in Nature.

The idea of quantum computing was introduced by the physicist Richard Feynman in 1982. The essential unit of classical computing, the bit, is binary. Like a light switch, it's either on or off, 1 or 0. The quantum bit, by contrast, can be 1, 0, or a mix of both states – this last state being like a flipped coin that's still spinning in the air.

The usefulness of this extra dimension seems, at first pass, more confusing than anything else, but it actually creates an new opportunity to represent data. Whereas a trillion classical bits can hold 243 on/off values, a mere 200 quantum bit, or qubits, as they are known, could represent 2200 values. This new capacity would allow future computers to do involved calculations at nearly unthinkable speeds, and solve problems that are currently unsolvable. The technological implications are too many to list, which suggests why there's such excitement surrounding the field.
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Re: How close are practical quantum computers really?

Post by Doctor X » Fri Apr 13, 2012 4:02 am

It is difficult to determine. . . .

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Re: How close are practical quantum computers really?

Post by Anaxagoras » Fri Apr 13, 2012 5:21 am

:lol:
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Re: How close are practical quantum computers really?

Post by Rob Lister » Fri Apr 13, 2012 11:09 am

And for the skeptical component

http://www.dwavesys.com/en/dw_homepage.html

I don't have it in me to research them. Mostly because I don't have it in me to 'get' quantum computing. There's some level of fundamental understanding I'm either missing or not.

http://tph.tuwien.ac.at/~oemer/doc/structquprog.pdf

Above if you have a fundamental want for a fundamental understanding. Good luck.

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Re: How close are practical quantum computers really?

Post by Cool Hand » Fri Apr 13, 2012 12:38 pm

Schrödinger's Mac? It's awesome and it sucks because Steve Jobs was an egomaniac at the same time until you turn it on. Then you find out you should have saved the Apple tax and just gotten a cheap PC instead.

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Re: How close are practical quantum computers really?

Post by DrMatt » Fri Apr 13, 2012 2:28 pm

I'm still hoping for a graphene-based system without all the weird stuff and heat loss.
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Re: How close are practical quantum computers really?

Post by Anaxagoras » Fri Apr 27, 2012 5:13 am

Researchers claim quantum breakthrough
Researchers say they have designed a tiny crystal that acts like a quantum computer so powerful it would take a computer the size of the known universe to match it.

Details of the crystal, which is made up of just 300 atoms, are published today in the journal Nature.
Wow.
And he adds that there is still plenty of work to be done before quantum computers start appearing on desks in homes and offices.

"The central element is something like a millimetre in diameter, 300 atoms that are suspended in space," says Biercuk.

"But of course everything depends on a huge amount of technical infrastructure around it. There are vacuum chambers and pumps and lasers, and all of that takes up something like a room."
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Re: How close are practical quantum computers really?

Post by Doctor X » Fri Apr 27, 2012 6:46 am

Your new laptop:

Image





We hope to have it in Technicolor [Tm.--Ed.] soon. . . .

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Re: How close are practical quantum computers really?

Post by DrMatt » Fri Apr 27, 2012 4:58 pm

Your new laptop might be a dumb terminal to something like that.
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Re: How close are practical quantum computers really?

Post by Anaxagoras » Wed Jul 04, 2012 11:47 am

Another advance

http://m.tgdaily.com/trendwatch-feature ... it-created

Sorry for the mobile link.
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Re: How close are practical quantum computers really?

Post by Abdul Alhazred » Wed Jul 04, 2012 4:06 pm

Coincidence? :o

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Re: How close are practical quantum computers really?

Post by DrMatt » Wed Jul 04, 2012 6:39 pm

Right, that's me driving: Auto-Matt...
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Re: How close are practical quantum computers really?

Post by ed » Wed Jul 04, 2012 9:22 pm

Pillory is holding out for an alcohol based computing system. :D
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Re: How close are practical quantum computers really?

Post by Anaxagoras » Mon Aug 08, 2016 11:58 am

Some recent news on the quantum computer front:

http://www.techradar.com/news/computing ... rd-1326213

And this:

http://www.livescience.com/55642-reprog ... eated.html

I don't know if this means practical quantum computers are just around the corner or if I'll be bumping this thread again in 4 years with another story about the latest 'breakthrough' published in Nature.
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Re: How close are practical quantum computers really?

Post by Tez » Mon Sep 05, 2016 8:56 pm

Anaxagoras wrote: I don't know if this means practical quantum computers are just around the corner or if I'll be bumping this thread again in 4 years with another story about the latest 'breakthrough' published in Nature.
you will be bumping this thread in 4 years (if you still care). I invest a lot of time (and other peoples money) in trying to build one and its a serious engineering challenge as well as a basic physics research opportunity.

Hopefully you do still care - having a QC will let us solve problems we don't even bother contemplating trying to simulate on a classical computer at present (eg problems in biochem/quantum chemistry/material science) and so the potential for these computers is difficult to quantify. It really is presently difficult to quantify what the upside is. I guess the same was true of regular computing at an early stage.

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Re: How close are practical quantum computers really?

Post by Dragline » Tue Sep 06, 2016 12:27 am

Thread is filled with men who got their mind right.
He ain't in the box because of the joke played on him. He back-sassed a free man. They got their rules. We ain't got nothin' to do with that. Would probably have happened to him sooner or later anyway, a complainer like him. He gotta learn the rules the same as anybody else.

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Re: How close are practical quantum computers really?

Post by Witness » Tue Sep 06, 2016 3:07 am

And AC will want a 16-quantum-core machine. :shock:

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Re: How close are practical quantum computers really?

Post by Anaxagoras » Mon Jan 21, 2019 11:46 am

CES: IBM announces Q System One, a quantum computer in a 9ft cube

Image

I guess this means we're at the Eniac stage of quantum computing. A 9-foot cube. Still, the thing exists. Like the early computers, it's not at the stage where you or I can afford one. Nor would I have the faintest idea what to do with it if I did have one. But I'm happy that they exist and that presumably somebody will know how to use them.
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Re: How close are practical quantum computers really?

Post by Doctor X » Mon Jan 21, 2019 11:57 am

Anaxagoras wrote:
Mon Jan 21, 2019 11:46 am
Nor would I have the faintest idea what to do with it if I did have one.
What you and all men do: look for tentacle porn.

--J.D.
Mob of the Mean: Free beanie, cattle-prod and Charley Fan Club!
"Doctor X is just treating you the way he treats everyone--as subhuman crap too dumb to breathe in after you breathe out."--Don
DocX: FTW.--sparks
"Doctor X wins again."--Pyrrho
"Never sorry to make a racist Fucktard cry."--His Humble MagNIfIcence
"It was the criticisms of Doc X, actually, that let me see more clearly how far the hypocrisy had gone."--clarsct
"I'd leave it up to Doctor X who has been a benevolent tyrant so far."--Grammatron
"Indeed you are a river to your people.
Shit. That's going to end up in your sig."--Pyrrho
"Try a twelve step program and accept Doctor X as your High Power."--asthmatic camel
"just like Doc X said." --gnome

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Re: How close are practical quantum computers really?

Post by Abdul Alhazred » Mon Jan 21, 2019 2:20 pm

Are you sure "Quantum" isn't just a brand name, as it might be "Android". :BigGrin3:
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