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Quantum Computing
#31
Posted 23 December 2005 - 09:53 PM
Spiritus, How about some fun? Virtual reality is old technology. Brain wave technology takes us beyond weak cyborg technology. Brain wave technology takes us beyond the reverse engineering of the brain. It takes us to reverse engineering of the mind. The spiritual realm is greater than the cyborg realm. A cyborg will not be capable of understanding the spiritual real the way the spiritual real will be able to understand the cyborg realm. Is it better to have a joker or two aces?
Love and Best Wishes Always,
~John
Be the best you can be and look for the best in others.
#32
Posted 24 December 2005 - 02:59 AM
If all else fails then I wish to stick around here for a LONG time. This land is great fun aswell.
#33
Posted 20 January 2006 - 04:23 AM
http://www.physorg.com/news10039.html
No "monte carlo methods" and other guesstimation approximations, quantum computers are bringing to bear the very phenomena that underpin the functioning of atoms and molecules in order to solve equations about atoms and molecules.
I submit to you that this application will be even more important than encryption and cryptanalysis.
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#34
Posted 04 April 2006 - 05:01 AM
I'm getting that the goal in their quantum experiments is to put an end to modern day encryption.
#35
Posted 28 April 2006 - 01:17 AM
Story about breakthrough from HP Labs' Quantum Information Processing Group dealing with optical quantum computing, and some of the inherent problems associated with working with light.
#36
Posted 13 July 2006 - 06:22 AM
I'm getting that the goal in their quantum experiments is to put an end to modern day encryption.
I took an interesting course on cryptography from someone who works on it for a living. It is true that a fullsized quantum computer would destroy modern encryption. This is because modern encryption is based on the slowness of factoring large numbers. The best known algorithm is the number field seive which is exponential time. However with quantum computers there is an algorithm (Shore's Algorirthm) which can factor in polynomial time. But the biggest number factored so far by a quantum computer is 15 so they are still a long way off.
#37
Posted 17 August 2006 - 02:14 AM
http://www.newscient...line-news_rss20
#38
Posted 28 June 2009 - 08:11 PM
(Nanowerk News) A team led by Yale University researchers has created the first rudimentary solid-state quantum processor, taking another step toward the ultimate dream of building a quantum computer.
They also used the two-qubit superconducting chip to successfully run elementary algorithms, such as a simple search, demonstrating quantum information processing with a solid-state device for the first time. Their findings will appear in Nature's advanced online publication June 28 ("Demonstration of two-qubit algorithms with a superconducting quantum processor").
"Our processor can perform only a few very simple quantum tasks, which have been demonstrated before with single nuclei, atoms and photons," said Robert Schoelkopf, the William A. Norton Professor of Applied Physics & Physics at Yale. "But this is the first time they've been possible in an all-electronic device that looks and feels much more like a regular microprocessor."
Working with a group of theoretical physicists led by Steven Girvin, the Eugene Higgins Professor of Physics & Applied Physics, the team manufactured two artificial atoms, or qubits ("quantum bits"). While each qubit is actually made up of a billion aluminum atoms, it acts like a single atom that can occupy two different energy states. These states are akin to the "1" and "0" or "on" and "off" states of regular bits employed by conventional computers. Because of the counterintuitive laws of quantum mechanics, however, scientists can effectively place qubits in a "superposition" of multiple states at the same time, allowing for greater information storage and processing power.
For example, imagine having four phone numbers, including one for a friend, but not knowing which number belonged to that friend. You would typically have to try two to three numbers before you dialed the right one. A quantum processor, on the other hand, can find the right number in only one try.
"Instead of having to place a phone call to one number, then another number, you use quantum mechanics to speed up the process," Schoelkopf said. "It's like being able to place one phone call that simultaneously tests all four numbers, but only goes through to the right one."
These sorts of computations, though simple, have not been possible using solid-state qubits until now in part because scientists could not get the qubits to last long enough. While the first qubits of a decade ago were able to maintain specific quantum states for about a nanosecond, Schoelkopf and his team are now able to maintain theirs for a microsecond—a thousand times longer, which is enough to run the simple algorithms. To perform their operations, the qubits communicate with one another using a "quantum bus"—photons that transmit information through wires connecting the qubits—previously developed by the Yale group.
The key that made the two-qubit processor possible was getting the qubits to switch "on" and "off" abruptly, so that they exchanged information quickly and only when the researchers wanted them to, said Leonardo DiCarlo, a postdoctoral associate in applied physics at Yale's School of Engineering & Applied Science and lead author of the paper.
Next, the team will work to increase the amount of time the qubits maintain their quantum states so they can run more complex algorithms. They will also work to connect more qubits to the quantum bus. The processing power increases exponentially with each qubit added, Schoelkopf said, so the potential for more advanced quantum computing is enormous. But he cautions it will still be some time before quantum computers are being used to solve complex problems.
"We're still far away from building a practical quantum computer, but this is a major step forward."
#39
Posted 10 July 2009 - 06:44 PM
http://arxiv.org/abs/0903.2030
#40
Posted 11 July 2009 - 01:18 AM
#41
Posted 03 September 2009 - 08:04 PM
A primitive quantum computer that uses single particles of light (photons) whizzing through a silicon chip has performed its first mathematical calculation. This is the first time a calculation has been performed on a photonic chip and it is major step forward in the quest to realise a super-powerful quantum computer.
The chip takes four photons that carry the input for the calculation, it then implements a quantum programme (Shor’s algorithm) to find the prime factors of 15, and outputs the answer – 3 and 5. The results are reported by a team of physicists and engineers from the University of Bristol in today’s issue of Science.
“This task could be done much faster by any school kid,” said PhD student, Alberto Politi, who, together with fellow PhD student Jonathan Matthews performed the experiment, “but this is a really important proof-of-principle demonstration.”
#42
Posted 03 September 2009 - 08:30 PM
#43
Posted 16 January 2010 - 08:19 PM
"Because classical computers don't scale efficiently, if you simulate anything larger than four or five atoms -- for example, a chemical reaction, or even a moderately complex molecule -- it becomes an intractable problem very quickly," says author James Whitfield, research assistant in chemistry and chemical biology at Harvard. "Approximate computations of such systems are usually the best chemists can do."
Aspuru-Guzik and his colleagues confronted this problem with a conceptually elegant idea.
"If it is computationally too complex to simulate a quantum system using a classical computer," he says, "why not simulate quantum systems with another quantum system?"
Such an approach could, in theory, result in highly precise calculations while using a fraction the resources of conventional computing.
While a number of other physical systems could serve as a computer framework, Aspuru-Guzik's colleagues in Australia used the information encoded in two entangled photons to conduct their hydrogen molecule simulations. Each calculated energy level was the result of 20 such quantum measurements, resulting in a highly precise measurement of each geometric state of molecular hydrogen.
#44
Posted 14 April 2013 - 09:23 AM
Bipolar spin blockade and coherent state superpositions in a triple quantum dot
http://www.nature.co...ano.2013.7.html
"...In this mechanism, charge is transferred non-intuitively via coherent states from one end of the linear triple dot circuit to the other, without involving the centre site. Our results have implications for future complex nanospintronic circuits..."
#45
Posted 18 May 2013 - 04:48 PM
Google and NASA Snap Up Quantum Computer D-Wave Two
http://www.scientifi...puter-dwave-two
#46
Posted 30 May 2013 - 03:54 PM
#47
Posted 30 October 2013 - 11:48 PM
Still, all the credit to organisations which try to solve this huge task. It being almost at the same level as what they are doing in Geneve, solving the origins of mass.
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