Scientists have established a record for distance quantum teleportation using intricate and "twisted" photons
Over the past three decades, the science of quantum communication and quantum computing has progressed quite a faster pace, constantly adding new protocols, algorithms and hardware. However, the practical implementation of all these theories, due to which it will be possible to realize a quantum Internet and create super-powerful quantum computers is quite a difficult task at the present time. The actual embodiment of the technologies required for the transmission and processing of quantum information, such as "elusive" quantum router constantly encounters the lack of knowledge and lack of other related technologies.
Anton Zeilinger (Anton Zeilinger), a researcher at the University of Vienna, is one of the pioneers of quantum technologies, his research group has carried out the first quantum teleportation using light photons in 1997. Recently, members of this group have announced that both managed to replay using the new method of quantum entanglement between independent qubits, which divides the distance of 143 kilometers. In addition, they were able to get a pair of entangled photons of light, swirling in a special way, which retained its involvement after going a distance of three kilometers.
To transmit quantum entanglement from one object to another, researchers used a curious phenomenon. They created two traditional way of entangled photons, and by changing the polarization of one of them, have achieved simultaneous change in the polarization of the second photon. Now imagine that there are two pairs of entangled photons, the numbers 0 and 1 in the area of the receiving node, and 2 and 3 in the transmitting node. Both pairs of entangled absolutely no influence on each other and do not even feel the presence of the second pair, in other words, between them there is no physical connection or quantum. Photon 3 is sent from the transmitter to the receiver, and interacts with a photon 1. As a result, photons 1 and 3 are complicated. And the most surprising thing is that, in parallel with the established channel of quantum entanglement between photons 0 and 2, even though they are separated by a distance, and they never interact directly with each other.
Currently, the group of Anton Zeilinger working together with researchers from the Chinese University of Science and Technology (University of Science and Technology of China) within the space project. The following year, the Chinese Academy of Sciences (Chinese Academy of Science) plans to launch a satellite Quantum Science Satellite, on board of which will be a quantum transceiver. The satellite and terrestrial stations in Europe and China, will form the first ever quantum network linking Earth and Space. "If we can create two quantum channel between a satellite and two ground stations, we get 100 percent secure quantum communication channel between Europe and China," - says Mario Krenn (Mario Krenn), a member of the Austrian research group.
Last year a group of Anton Zeilinger reported a successful experiment in which was carried out quantum teleportation of information encoded in the form of the orbital angular momentum (orbital angular momentum, AOM) polarization of a photon of light. The usual form photons can have only two kinds of polarization, so-called polarization levels. But the number of discrete orbital angular momentum of the photon polarization twisted almost unlimited. "In our new laboratory experiments, we have shown that it is possible to create quantum entanglement acting once in a hundred measurements covering a hundred different levels of polarization" - says Mario Krenn - "And such a vast confusion can be kept active at a distance of three kilometers."
"Control of the quantum state of twisted photons is much more difficult than simply measuring the level of polarization of the ordinary photon" - says Mario Krenn, - "But we managed to implement a suitable method of synchronous measurement, which guarantees the absence of the influence of independent pairs of entangled photons at each other and that showed that photons with AOM-involvement retain it as a passing through the fiber under ideal conditions, and through the atmosphere, which can cause distortion of the light passing through it. "
Over the past three decades, the science of quantum communication and quantum computing has progressed quite a faster pace, constantly adding new protocols, algorithms and hardware. However, the practical implementation of all these theories, due to which it will be possible to realize a quantum Internet and create super-powerful quantum computers is quite a difficult task at the present time. The actual embodiment of the technologies required for the transmission and processing of quantum information, such as "elusive" quantum router constantly encounters the lack of knowledge and lack of other related technologies.
Anton Zeilinger (Anton Zeilinger), a researcher at the University of Vienna, is one of the pioneers of quantum technologies, his research group has carried out the first quantum teleportation using light photons in 1997. Recently, members of this group have announced that both managed to replay using the new method of quantum entanglement between independent qubits, which divides the distance of 143 kilometers. In addition, they were able to get a pair of entangled photons of light, swirling in a special way, which retained its involvement after going a distance of three kilometers.
To transmit quantum entanglement from one object to another, researchers used a curious phenomenon. They created two traditional way of entangled photons, and by changing the polarization of one of them, have achieved simultaneous change in the polarization of the second photon. Now imagine that there are two pairs of entangled photons, the numbers 0 and 1 in the area of the receiving node, and 2 and 3 in the transmitting node. Both pairs of entangled absolutely no influence on each other and do not even feel the presence of the second pair, in other words, between them there is no physical connection or quantum. Photon 3 is sent from the transmitter to the receiver, and interacts with a photon 1. As a result, photons 1 and 3 are complicated. And the most surprising thing is that, in parallel with the established channel of quantum entanglement between photons 0 and 2, even though they are separated by a distance, and they never interact directly with each other.
Currently, the group of Anton Zeilinger working together with researchers from the Chinese University of Science and Technology (University of Science and Technology of China) within the space project. The following year, the Chinese Academy of Sciences (Chinese Academy of Science) plans to launch a satellite Quantum Science Satellite, on board of which will be a quantum transceiver. The satellite and terrestrial stations in Europe and China, will form the first ever quantum network linking Earth and Space. "If we can create two quantum channel between a satellite and two ground stations, we get 100 percent secure quantum communication channel between Europe and China," - says Mario Krenn (Mario Krenn), a member of the Austrian research group.
Last year a group of Anton Zeilinger reported a successful experiment in which was carried out quantum teleportation of information encoded in the form of the orbital angular momentum (orbital angular momentum, AOM) polarization of a photon of light. The usual form photons can have only two kinds of polarization, so-called polarization levels. But the number of discrete orbital angular momentum of the photon polarization twisted almost unlimited. "In our new laboratory experiments, we have shown that it is possible to create quantum entanglement acting once in a hundred measurements covering a hundred different levels of polarization" - says Mario Krenn - "And such a vast confusion can be kept active at a distance of three kilometers."
"Control of the quantum state of twisted photons is much more difficult than simply measuring the level of polarization of the ordinary photon" - says Mario Krenn, - "But we managed to implement a suitable method of synchronous measurement, which guarantees the absence of the influence of independent pairs of entangled photons at each other and that showed that photons with AOM-involvement retain it as a passing through the fiber under ideal conditions, and through the atmosphere, which can cause distortion of the light passing through it. "
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