An international team of physicists managed to teleport for the first time information in a solid-state quantum memory, which is a prerequisite for the future of the quantum internet.
In quantum teleportation there is no mass transfer, but only the information describing the state of the quantum system emitting the energy is transferred. signal. The quantum system that receives it takes on all the properties of the transmitted quantum state, creating an exact replica.
This kind of technology is behind a new generation of computing systems, including quantum internet, which, among other things, promises the exchange of information between computers with absolute security.
New research developments took place at the University of Geneva, where the international scientific team used a crystal soaked in rare earth ions as a quantum memory in which they first transported information by means of an ordinary medium such as optical fiber.
One of the basic requirements for the teleportation of information is the generation of coupled photons, with a wavelength proportional to the diameter of the optical fiber. The coupled particles are predicted by quantum physics, and are pairs of particles whose quantum properties influence each other (described by a common function), even when they are far apart.
The creation of coupled photons with such stringent wavelength specifications was a greater difficulty for the researchers, however, they managed to produce such pairs, even at two different infrared frequencies. The information teleported at last was the polarization of a photon with a wavelength of 1338nm . The signal traveled 12 kilometers of optical fiber to transmit from one quantum memory to another successfully, as subsequent measurements of the photon-receiver polarization were exactly what quantum theory predicted.
This is another important step for quantum computing systems, which have begun to concentrate on an ever increasing research interest.
