A photo from open sources if in the ordinary world we can to photograph only what we see, then the new quantum technique Photography greatly expands the possibilities of man. Command physicists have developed a new way of shooting objects with entangled photons: scientists captured the shape of a cat, but the light used did not even interact with the person being photographed object.
The main role in this experiment was played by the phenomenon of quantum entanglement, which describes a pair of particles whose state inextricably linked to each other. No matter how far apart entangled particles were found, the state of one of them instantly will change as soon as the state of her partner changes.
This feature of physics was used in their experiment – one the photon interacts with the subject, while another flies into the detector. And since the latter does not interacts with the subject, we can say that in the picture captured something that does not exist in reality.
“In ordinary photography, you need to” catch “the photons reflected from the subject you are shooting. Quantum photography allows this don’t do it, “says lead author Anton Zeilinger (Anton Zeilinger), physicist from the Austrian Academy of Sciences in Vienna.
According to Zeilinger, the advantage of this technique is that entangled photons need not have the same level energy. This means that the colors of the photographed and displayed Objects may be different. So, scientists immediately describe potential application of a new technique. For example, low energy photons can be sent through biological samples, and their high-energy partner particles located in state of quantum entanglement, will display the real shape object in the visible range. Physicists talk about this in their article published in the journal Nature.
Zeilinger and his colleagues say that their experiment is based on a theoretical idea, first set out in 1991. Photon has two possible ways in which it can go to the detector. On the each of these paths should have a crystal that turns a particle into a pair of entangled photons, but only on one of paths is the photographed object.
“In accordance with the laws of quantum physics, unless an observer trying to determine which path the photon went through, then the particle goes along two of the possible paths at once, and a couple of entangled photons formed at the exit of each crystal, “says co-author research by Gabriela Barreto Lemos, also employee of the Austrian Academy of Sciences.
On the first path, the photon partner interacts with the person being photographed. object, and being in a state of quantum entanglement with it the particle does not. The first photon subsequently combines with its intact partner, after which it is thrown out of the system.
The remaining particle of light that passed along the second path, reunites with itself, having passed along the first path, and heads towards the camera where it is used to create images despite the fact that she did not interact with the subject of the shooting.
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The physics outlines used the outline of a cat, whose width was only a few millimeters. Then they experimented with some other images, engraved in a silicon wafer. But much more important is another: that the wavelength of the photon interacting with the image is not allows you to display the outlines using the camera, while partner particles, on the other hand, had the right wavelength.
“This aspect is very important for validation. quantum photography method, “Zeilinger notes.
Similar experiments were previously carried out as called ghost imaging experiments. IN in this case also only one photon from a pair interacts with object, however, both must fall into the detector to obtain snapshot. The method of Austrian physicists is simpler because the detector only one particle from a pair gets.
And according to Zeilinger, the participation of both photons from a pair makes wonder if the ghostly photograph really is a consequence of the use of the laws of quantum mechanics, or is it the phenomenon can be explained by classical physics. Methodology of scientists from Veins (due to different wavelengths) can exist only within quantum laws.
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