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Today, the next part of physics and quantum mechanics. I think you’ll like it. Regards, admin – Regina
Teleportation and quantum entanglement
Quantum mechanics should be a lot of respect. But an inner voice tells me that it is not real gold. This theory gives us a lot, but it hardly brings us closer to know the secret of the Creator. At least if you ask me, I am convinced that He does not play dice.
Albert Einstein
Albert Einstein realized that relativity theory is not complete. The same argument put forward against the then nascent quantum mechanics. Einstein, along with two scientists: Boris Podolsky and Nathan Rosen proposed a mental experiment called EPR paradox (the names of the authors), which was to prove that quantum mechanics is not a complete theory. EPR paradox refers to the pairs of quantum particles. Using mathematical quantum mechanics it is shown that in certain situations the quantum particles that have reacted with each other in a specific way, they should immediately respond to the change in the quantum state of their partner, even if it is away from any distance. It is this „any distance” contradicts Einstein’s theory of relativity as the EPR paradox implies an immediate response, and the information can not be transmitted from place to place faster than the speed of light, which automatically generates the delay.
EPR paradox is something that today we know as quantum entanglement. Entangled state – the type of correlated quantum state of two or more particles and other quantum systems. It is impossible trait of classical physics that the state of the entire system is better defined than the state of its parts. With confusion we face when the wave function of the system consisting of two subsystems can not be written as the product of the wave functions of each of the subsystems. There is, for example, the state of polarization entangled two photons, so-called. singlet, which has the property that, if we measure the polarization of the two photons using two identically arranged but distant polarizers, it will always receive the two opposite polarity. In contrast, the measured polarization of each photon individually are completely random. Thus the pair of photons in the singlet state has a clearly defined common property (polarization measured in the same set polarizers are always opposite), while the sub-system, ie, single photon, is completely indeterminate – the result of measuring the polarization of a single photon is completely random. Confusion does not fade with distance – so provides quantum theory. Quantum entanglement is one of the most amazing properties of quantum mechanics. It is crucial in the context of quantum information, quantum cryptography, and many other branches of science and engineering future. Quantum teleportation (QT stands Quantum teleportation) – in quantum information theory technique allows for the transfer of the quantum state at any distance using an entangled state. Quantum teleportation is useful in quantum communication and quantum computation while. First quantum teleportation has been made in 1997. Seven years later teleported quantum state of one atom to another. In 2006 he teleported the quantum state of the light pulse to a trillion cesium atoms. 5 years later teleported the first wave of light. A year later leveled then record furthest quantum teleportation, making it a distance of 143 km. Also this year teleported quantum state of the atom to the other. In 2013 the matter qubits teleported to a record distance 21 meters.
Researchers from the University of Delft in the Netherlands in May of this year we managed to teleport information between two computers over three meters. Computers were able to exchange information, although not with each other in any way connected. The data do not beat the direct three-meter space between them, and simply appeared immediately on the second device. In contrast to similar experiments in the past, researchers have made 100 percent repeatability of the effect on the chosen distance.
The data have been transferred, have been recorded on the diamond quantum bits, which in the future may be used for the development of quantum computers and quantum internet. In addition to the infinite speed advantage of this type of network is that the information transferred will be fully protected, without the possibility of their acquisition by a third party.
The researchers plan to repeat the experiment, this time at a distance of 1,300 meters between devices. The question of whether the future can be teleported man replied, „As far as the laws of physics, it does not have any contraindications that it can not teleport even large objects, including people (…) if we believe that we are a jumble of atoms connected in a certain way, then the same rules that they can teleport through quantum entanglement. ”
Also physicists from the University of Geneva conducted in September 2014. Experiment, in which the teleported quantum state of a photon to the crystal by optical fiber with a length of 25 km. Thus managed to beat the previous record of 2003, which was 6 km. In this experiment, the laser was used to produce quantum entanglement of two photons. One of the photons sent through the optical fiber and the other to the crystal. Then physicists generated a third photon, and also sent him through the optical fiber to the hit in the previously sent a photon. This resulted in the destruction of both of them. The researchers then found that the information they contained the third photon is not destroyed and sent to the crystal, where he was one of the quantum entangled photons. In this way, managed to make quantum teleportation and beat the previous record distance and made this the same team of scientists at in 2003. „The state of a quantum two elements of light, the two entangled photons, which are like Siamese brothers, is a channel that allows teleportation of light to matter” – said one of the authors, Felix Bussieres. It is yet another advancement in the field of quantum teleportation. This technology could have practical applications in many fields, but before that happens, certainly it will be necessary to conduct further research. At the finish, and soon articles about time travel, quantum motor and worm-hole.
Źródło: wikipedia.org, siencemag.org, innemedium.pl, Nature Photonic
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