Go Back   Physics Help Forum > College/University Physics Help > Quantum Physics

Quantum Physics Quantum Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Sep 5th 2009, 03:22 PM   #1
Junior Member
 
Join Date: Aug 2009
Posts: 27
Describe a quantum computer

I would like to know if the following counterintuitive statement is representative for how a supposed quantum computer is believed to posses an exponential speed up over modern modern computers:

Define a $\displaystyle 1 qubit$ system as one machine, a $\displaystyle 2 qubit$ system as two machines, and so on.

If one machine can accomplish a task in 64 minutes, then 2 machines can accomplish the task in 16 minutes, while 3 machines can accomplish it in 8 minutes, while 4 machines in only 4 minutes.
jamix is offline   Reply With Quote
Old Sep 5th 2009, 05:26 PM   #2
Physics Team
 
Deco's Avatar
 
Join Date: Jul 2009
Posts: 310
You have the correct idea.

I like to think of it by comparing a computer to
a building full of offices. Instead of checking
one office at a time, a quantum computer allows
us to check multiple (or several) offices at one time.
__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC
Deco is offline   Reply With Quote
Old Sep 5th 2009, 05:38 PM   #3
Junior Member
 
Join Date: Aug 2009
Posts: 27
I doubt an efficient quantum computer will ever be realized. The ideas for what such a device can accomplish sounds like pseudoscience when you think about it.
jamix is offline   Reply With Quote
Old Sep 5th 2009, 05:54 PM   #4
Physics Team
 
Deco's Avatar
 
Join Date: Jul 2009
Posts: 310
Quantum computers have already been created.
__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC
Deco is offline   Reply With Quote
Old Sep 5th 2009, 06:13 PM   #5
Junior Member
 
Join Date: Aug 2009
Posts: 27
I said I doubt an efficient quantum computer will ever be created. The ones that currently exists use only a couple of qubits, they require tons of resources, and they don't even work that accurately.
jamix is offline   Reply With Quote
Old Sep 5th 2009, 06:14 PM   #6
Physics Team
 
Deco's Avatar
 
Join Date: Jul 2009
Posts: 310
Originally Posted by jamix View Post
I said I doubt an efficient quantum computer will ever be created. The ones that currently exists use only a couple of qubits, they require tons of resources, and they don't even work that accurately.

...and yet they are still faster than an average laptop.

Give it time, we'll have a proper quantum computer within 15 years.
__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC

Last edited by Deco; Sep 5th 2009 at 06:23 PM.
Deco is offline   Reply With Quote
Old Sep 5th 2009, 06:25 PM   #7
Junior Member
 
Join Date: Aug 2009
Posts: 27
They are still far slower than any modern device

In fact, the complete version of a rudimentary quantum computer has only just been accomplished. See Tiny device is first complete 'quantum computer' - physicsworld.com
jamix is offline   Reply With Quote
Old Sep 5th 2009, 06:30 PM   #8
Physics Team
 
Deco's Avatar
 
Join Date: Jul 2009
Posts: 310
They are still far slower than any modern device
Ultrafast quantum computer uses optically controlled electrons

1-10 GHz. I'd say thats pretty decent.
__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC
Deco is offline   Reply With Quote
Old Sep 5th 2009, 06:43 PM   #9
Junior Member
 
Join Date: Aug 2009
Posts: 27
In the article, it mentions that the speed gets reduced to 1-10MHz not 1-10GHz. Furthermore, they haven't actually built the machine, so that idea is still hypothetical.
jamix is offline   Reply With Quote
Old Sep 5th 2009, 07:32 PM   #10
Physics Team
 
Deco's Avatar
 
Join Date: Jul 2009
Posts: 310
Yes, they have.

First Quantum Computer Demonstrated
__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC
Deco is offline   Reply With Quote
Reply

  Physics Help Forum > College/University Physics Help > Quantum Physics

Tags
computer, describe, quantum



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Man's ability and computer philipishin Physics Software 3 Jul 13th 2016 02:35 PM
Quantum Troubles omegaz Quantum Physics 3 May 6th 2013 08:53 AM
Describe the main stages of an active noise control system. George321 Waves and Sound 0 Feb 14th 2010 05:14 PM
Recommend a Computer Course for Physics Major rubrix General Physics 6 Jul 12th 2009 04:52 AM


Facebook Twitter Google+ RSS Feed