How close are practical quantum computers really?

We are the Borg.
Anaxagoras
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How close are practical quantum computers really?

Post by Anaxagoras »

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.
Doctor X
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Re: How close are practical quantum computers really?

Post by Doctor X »

It is difficult to determine. . . .

--J.D.
Anaxagoras
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Re: How close are practical quantum computers really?

Post by Anaxagoras »

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

Post by Rob Lister »

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.
Cool Hand
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Re: How close are practical quantum computers really?

Post by Cool Hand »

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.

CH
DrMatt
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Re: How close are practical quantum computers really?

Post by DrMatt »

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

Post by Anaxagoras »

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."
Doctor X
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Re: How close are practical quantum computers really?

Post by Doctor X »

Your new laptop:

http://timecheapskate.files.wordpress.c ... .jpg?w=576





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

--J.D.
DrMatt
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Re: How close are practical quantum computers really?

Post by DrMatt »

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

Post by Anaxagoras »

Another advance

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

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

Post by DrMatt »

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

Post by ed »

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

Post by Anaxagoras »

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.
Tez
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Re: How close are practical quantum computers really?

Post by Tez »

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.
Dragline
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Re: How close are practical quantum computers really?

Post by Dragline »

Thread is filled with men who got their mind right.
Witness
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Re: How close are practical quantum computers really?

Post by Witness »

And AC will want a 16-quantum-core machine. :shock:
Anaxagoras
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Re: How close are practical quantum computers really?

Post by Anaxagoras »

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

https://d3w2mpp70f6o8z.cloudfront.net/m ... th-880.jpg

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.
Doctor X
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Re: How close are practical quantum computers really?

Post by Doctor X »

Anaxagoras wrote: Mon Jan 21, 2019 11:46 amNor 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.
Nyarlathotep
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Re: How close are practical quantum computers really?

Post by Nyarlathotep »

They are only about 6 inches away, but very very small
Witness
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Re: How close are practical quantum computers really?

Post by Witness »

Anaxagoras wrote: Mon Jan 21, 2019 11:46 am https://d3w2mpp70f6o8z.cloudfront.net/m ... th-880.jpg
Does it brew good espresso? :P
Anaxagoras
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Re: How close are practical quantum computers really?

Post by Anaxagoras »

Interesting analysis from an actual scientist:



The video description has links to some of the articles and resources mentioned in the video.

The quantum hype cycle, revisited (physicsworld)

The quantum computing bubble (Financial Times)

Quantum Computing Hype is Bad for Science (Professor Victor Galitski via Linkedin)
Crazy headlines abound: "quantum computing will change life as we know it," "quantum computing will solve global warming," "Quantum computing will revolutionize science and industry," etc etc. These statements are not based on any research or reality at all, they are not even wishful thinking. The number of known quantum algorithms, which promise advantage over classical computation, is just a few (and none of them will "solve global warming" for sure). More importantly, exactly zero such algorithms have been demonstrated in practice so far and the gap between what’s needed to realize them and the currently available hardware is huge, and it's not just a question of numbers. There are qualitative challenges with scaling up, which will likely take decades to resolve (if ever).