This cannon may represent a significant breakthrough in the creation of an optical quantum computer
Researchers from the Technion and "Imperial College" in London have designed a "photon cannon" that shoots bundles of photons (particles of light) that are intertwined. The proposal was recently published in the prestigious scientific journal "Physical Review Letters" and arouses extraordinary interest in the large scientific community trying to build a quantum computer.
"There is a huge interest in building a quantum computer," explains doctoral student Nathaniel Lindner from the Technion's Faculty of Physics. "16 quantum bits (qubits) are equivalent to a powerful desktop computer with a memory of four gigabytes (thirty-two billion bits). While the addition of a "normal" bit increases the calculation capacity by one unit, each additional quantum bit doubles (!) the calculation power (for example - 17 qubits will already be equivalent to a computer with sixty-four billion bits).
Therefore, the motivation to create a quantum computer is very high, but in the last decade it became clear that increasing the number of qubits is an extremely complicated business, due to the difficulty of creating entangled particles that will be used as qubits.
Interweaving between particles is a fascinating phenomenon unique to quantum mechanics, and is one of the most prominent examples of the fundamental difference between it and the worldview of classical mechanics. The entanglement makes it possible, for example, to teleport states, and is the basis of future quantum computers. Quantum teleportation allows the transfer of information without a physical carrier, immediately and without distance limitation.
Many scientists think that photons are the best candidates to be quantum bits, but even those are difficult to make entangled. Nathaniel Lindner from the Faculty of Physics at the Technion and Dr. Terry Rudolph from "Imperial College" in London proposed a new method, in which artificial atoms made of semiconductors ("quantum dot" in the professional language), emit strings of interwoven photons in a controlled manner.
"Currently accepted methods produce entangled photons in an uncontrolled way. Therefore, with these methods, researchers were able to entangle six photons at most, and it will be very difficult to progress beyond that. On the other hand, we estimate that the amount of entangled photons that can be obtained with our method - will be significantly large", says Nathaniel Lindner.
The experimental physicist Professor Andrew White from the important center for quantum optics in Australia, was recently interviewed by the magazine "New Scientist" and said that "this is an amazing work, the most exciting theoretical proposal I have read in the last five years. In my opinion, it will be a revolutionary advance in optical quantum computing", he emphasized.
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Itzik:
It is difficult to predict, but according to the theory of relativity this should be impossible and it would violate the principle of conservation of causality (that is, there will be systems in which the cause and the effector will appear as if they happened in the opposite order)
In Orson Scott Card's book "Ender's Game", students at a commander's school conduct simulated battles against the enemy. Later it turns out that these battles are real and they commanded fleets of spaceships that were sent two generations before from Earth to the enemy worlds and moved at the relative speed when the speed of light is the limit, but the communication to them is carried out with the help of the "ansible" device is immediate and does not depend on the speed of light.
From the article and previous articles I read about the principle of interweaving, it appears that such a device can be realistic. If you create a entanglement of the particles, some remain on Earth and some are sent inside a machine that holds them in some way, then we have a communication device that is faster than light and it may be that the idea is not entirely imaginary.
And now back to the drawing board
To Ehud and Michael, thank you very much!
I have a "little" more than five minutes of reading here in order to internalize the information and try to understand correctly!
Best regards,
Uncle
http://en.wikipedia.org/wiki/Quantum_computer
Uncle
A quantum computer is based on the guiding principles of quantum mechanics and allows, if they succeed in producing it, to increase the calculation rate by tens of meters, today the idea is mainly used to receive funds from foundations.
In the mid-XNUMXs, the computer scientist Peter Shore showed that if a quantum computer existed, this computer would be able to decompose large numbers into their initial components in a polynomial "time" of the length of the input instead of an exponential "time" which is the currently known barrier to "normal" computation - i.e. a machine Turing. This algorithm is called Shore's algorithm and it created the tremendous motivation for research in the field. It should be noted that extracting a number into its initial components is of great importance in encryption methods - the fact that extracting this is a difficult problem enables effective encryption (RSA).
Since Shore's algorithm, countless physical systems have been proposed as a basis for a quantum computer, but today a breakthrough in the field has not yet been achieved. A quantum computer must maintain its quantum properties - superpositions and interweaving of states, against the destructive influence of the environment. The isolation of the calculation system from the influence of the environment is what makes the problem complex.
The quantum computer is based on the superposition principle that allows a computational bit not only to be 0 or 1 but to be found in a superposition of 0 and 1. A linear combination of the two states at the same time will add to this logic gates that operate on superpositions and get a quantum computer. The above explanation is far from accurate or true, but the limitations of space and the assumptions about prior knowledge are severe limitations.
Guess there was a mistake:
Experimental and non-experimental physicist.
If they weren't in trouble, their friends wouldn't have stood up to help them....
The fact that they cause hardship to dozens of website owners who are not members of their networks is of no interest to any of the queer eaters above.
First of all, I burst out laughing from "The Three Families of Trouble" - big!
And regarding the article - who can please explain the principle of operation of a quantum computer? What is its advantage over the existing one? What's new here?
What hardware will it require? and the like. . .
I know these are dumb questions, but I really want to understand this.
Thanks in advance to the honest and generous respondents,
Uncle
Mushon:
This is not a translation but the original publication of the Technion.
What is accepted regarding the impossibility of transferring information at a speed exceeding the speed of light is accepted in relation to the proactive transfer of known information.
In other words - the whole point here is in the meaning of the word "information".
When the state of one of the sons of a pair of entangled particles is measured - the state of the other is also determined.
It is also a legitimate thing to call it the transfer of information and it is something that not only do not know that it is not possible but that they know that it is happening.
sorry but…
It is written in the article that:
"Quantum teleportation allows the transfer of information...immediately and without distance limitation."
To the best of my knowledge it is not possible to ***transfer information***
At a speed that exceeds the speed of light, not even in quantum teleportation
translation maafan?
Indeed a very objective discussion...
And where can I find more details?
Haim:
There are several other options, of course, the most serious of which is based on the fact that you can offer to finance the site's costs yourself (computers, software, labor, etc.)
So you'll have to settle for websites that are operated by small children or interested people (returners, for example).
It's really not the surfers' problem. We hate ads. point
If everyone uses it, where will the sites get money from to pay for the server (and a private server is an expensive business), and in the case of commercial sites also to pay salaries to employees?
There is a computer program called ad muncher
that will allow you to browse a site full of advertisements [not that it's full] without seeing a single one
Hello. I wish I had direct advertisers, but as long as they prefer to only advertise on the websites of the three 'families in distress' we have no choice but to rely on Google and that's what we have, I wish that even within Google there were only publications by educational institutions and high-tech companies.
The site has an indelible advertisement for treating back pain - which is disturbing and causes headaches.
Can't you kick her?
Why is there no detail?? !
"We estimate that the amount of entangled photons that can be obtained with our method - will be significantly large"
But what is "your method"?? What does it include? What is the theory? On what principles is the method based? How many photons do you estimate will be possible to weave using your method? Why is nothing specified and everything is only stated in very general terms? This is supposed to be a scientific site!! Such information is suitable for a gossip section, not a scientific section.