Physicists have learned to transfer qubits by the usual optical fiber
For quite a lot of research done on the transmission of quantum signals and even held a successful test of the technology. But for all the potential advantages of quantum computers and quantum information network is, they have a major drawback: the specific unit of information transfer (qubits) for which you want from the ground to lay their own lines of communication. But a group of researchers from the Netherlands has made significant progress in this area and was able to use to transmit qubits conventional fiber.
To begin with, we recall that the qubit is and what he's so good. The name of the qubit is derived from the merger of the words "quantum" and "bit". In other words, the same bit that is used in classical data transmission system, but it differs in that it has the property of quantum entanglement. And this, if not going into details, allowing it to produce an extremely large amount of computation and transmit data at such speeds that ordinary modern technology not even dreamed of.
So, in a series of research team of scientists from the University of Groningen has found a way to create qubits whose radiation close to the wavelength of light, which makes it possible to transmit information using an optical fiber. To achieve these results, researchers have created special crystals of silicon carbide of molybdenum color centers. These centers are irradiated with laser. After this exposure, electrons in the outer shell of molybdenum atoms move to a higher energy level, and returning back to radiate energy as a photon. Further, experts use a method called Soherent Ropulation Trapping (CPT), which creates a superposition of atoms under the influence of two resonant optical fields. As a result of the above actions could create a qubit, which persists for a long time superposition and it emits photons of a particular wavelength. As the publication of Quantum Information, qubits by a university-based, transmit information at a wavelength of 1100 nanometers. The most commonly used wavelengths for fiber optic networks are 850, 1300, 1310 and 1550 nanometers and 1100 nanometers is used here, is unfortunately extremely rare. But according to experts, even this is a major breakthrough, and they approached the creation of qubits, "working at a wavelength of 1300 to 1500 nanometers."
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