
Theory of Computation Theoretical Computer Science  Automata Theory, Computability Theory, and Computational Complexity Theory 
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December 2nd, 2007, 12:35 PM  #1 
Joined: Dec 2007 Posts: 138  Quantum Computing...
Anyone know offhand the state of solidstate quantum computing today? Number of bits... Time before the machines stop working... etc... 
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December 4th, 2007, 07:08 AM  #2 
Joined: Dec 2007 Posts: 24  Re: Quantum Computing...
That's pretty bad, when we're talking about how long it takes before the machine breaks. :mrgreen: At least last I knew, not much progress had been made beyond very simple computations. I remains to be seen whether any new significant breakthroughs can be achieved, ones which would allow the quantum computer to actually function as well as the PC's we have these days. The only quantum calculation I remember was where 15 was factored into 3 and 5. Not very many bits are required for that. :roll:

December 4th, 2007, 12:11 PM  #3  
Joined: Dec 2007 Posts: 138  Re: Quantum Computing... Quote:
the "how long before it breaks" part is mostly because entangled particles don't like to stay entangled for very long. Last I knew, they had gotten a 3 bit machine to work for a few hours.. but that was a couple of years ago.  
December 6th, 2007, 07:28 AM  #4  
Joined: Dec 2007 Posts: 232  Re: Quantum Computing... Quote:
21 won't be nearly as easy, and 35 seems all but impossible.  
December 8th, 2007, 09:14 AM  #5 
Joined: Dec 2007 Posts: 24  Re: Quantum Computing...
So is a quantum computer really digital, or is it something else?

December 8th, 2007, 12:17 PM  #6  
Joined: Dec 2007 Posts: 138  Re: Quantum Computing... Quote:
Basically, each bit can be used in more than one computation at the same time, so it can have a state of 1 for computation A and 0 for computation B. Suddenly, you have a lot more power.  
December 8th, 2007, 06:14 PM  #7 
Joined: Dec 2007 Posts: 187  Re: Quantum Computing...
I have a question: if a person wants to study about quantum computing, then does that person also has to know quantum physics? (Reason I'm asking this is because the names of the topics sound similar "quantum" computing and "quantum" physics). I was interested in quantum computing, but I don't really want to study physics.

December 8th, 2007, 07:49 PM  #8  
Joined: Dec 2007 Posts: 138  Re: Quantum Computing... Quote:
Assuming you're in high school (Yes?), I would guess that by the time you would be at a stage to be "researching" quantum computing, it will be at a much more advanced stage... but the future is a fickle mistress... I've thrown out far too many good one liners in far too short of a time span on this forum... AND I'm humble.  
December 8th, 2007, 08:28 PM  #9  
Joined: Dec 2007 Posts: 232  Re: Quantum Computing... Quote:
http://arxiv.org/pdf/quantph/0112176  
December 8th, 2007, 08:29 PM  #10 
Joined: Dec 2007 Posts: 232  Re: Quantum Computing...
Plus, there's no such thing as a quantum computer, not yet. The factorization of 15 was done under very controlled conditions, in a lab not a standalone unit.

December 8th, 2007, 09:36 PM  #11 
Joined: Dec 2007 Posts: 187  Re: Quantum Computing...
Thanks to cknapp and CRGreathouse for the informations on quantum computing. I have another question: In general (not necessary only quantum computing), if someone wants to study computer science, then does that person also has to study physics? I don't have interest studying physics, but I would like computer science. 
December 9th, 2007, 08:52 AM  #12  
Joined: Dec 2007 Posts: 138  Re: Quantum Computing... Quote:
 
December 9th, 2007, 10:54 AM  #13  
Joined: Dec 2007 Posts: 187  Re: Quantum Computing... Quote:
 
December 9th, 2007, 01:47 PM  #14 
Joined: Dec 2007 Posts: 138  Re: Quantum Computing...
You won't need any advanced physics, no.

January 21st, 2009, 06:28 AM  #15 
Joined: Dec 2008 Posts: 32  Re: Quantum Computing
I like Quantum Computing very much.


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