Physicists have learned to transfer qubits on a conventional fiber optic cable
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Quite a lot of research done on the subject of the transmission of a quantum signal and even conducted a successful test of this technology. However, with all the potential advantages of quantum computers and quantum information networks they have a significant drawback: a specific bit of information (qubit) for which you want to run your own lines. But a group of researchers from the Netherlands have made significant progress in this area and was able to use to transfer qubits of a conventional optical fiber.
To begin with we recall what is a qubit and how it is so good. The name 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 because it has a property of quantum entanglement. And this, if not going into details, allows him to produce extremely large amounts of computation and data transfer speeds that a normal modern technology not even dreamed of.
So, in the course of a number of researches the group of scientists from the University of Groningen have found a way to create qubits whose radiation close to the wavelength of light that allows you to transfer information using optical fiber. In order to achieve these results, scientists have created a special silicon carbide crystals with color centers of molybdenum. These centers were irradiated lasers. After exposure, the electrons in the outer shell of atoms of molybdenum are moving to a higher energy level, and coming back, emit energy in the form of a photon. Further, the experts used a method called Сoherent Рopulation Tharp (SRT), which allows you to create a superposition of atoms under the influence of two resonant optical fields. In the actions described above were able to create a qubit, where for a long time, there is a superposition and it emits photons of a specific wavelength.
As the publication of Quantum Information, qubits, based at the University, provide information on the wavelength of 1100 nanometers. The most commonly used values of wavelengths for fiber-optic networks are 850, 1300, 1310 and 1550 nanometers and 1100 nanometers is used here, unfortunately, extremely rare. But according to experts, even this is a big breakthrough and they came close to creating qubits, "working on the wave length of 1300 and 1500 nanometers."
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