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For the first time, researchers from Austria and China have managed to teleport three dimensional quantum states. This teleportation of higher dimensional states might play an important role in quantum computers in the coming days.
Scientists from the University of Vienna and the Austrian Academy of Sciences have demonstrated what was previously thought of as only a theoretical possibility. With the scientists from the University of Science and Technology of China, they were able to teleport complex high-dimensional quantum states. This is reported in the journal Physical Review Letters.
Scientists teleported the quantum state of a qutrit to another distant one. Earlier scientists were able to transport qubits, which have only two-level states. But scientists have now successfully teleported a qutrit which was created from the photon and has three-level states.
Since the 1990s, it was known that multidimensional quantum teleportation can be achieved. Manuel Erhard, Vienna Institute for Quantum Optics said that the first step was to design a technique to implement high-dimensional teleportation along with the technology. To teleport a quantum state, it is encoded in the possible paths which can be taken by the photon. Paths can be correlated to three optical fibers. Interestingly, in quantum physics, one photon might be present in all the fibres at once.
Bell measurement is at the core of quantum teleportation. A multiport beam splitter is used that directs photons with the help of many inputs and outputs thereby connecting the optical fibers. Also, auxiliary photons were used which were sent to the multiple beam splitter for interfering with other photons.
By selecting specific interference patterns, quantum information can be sent to a photon situated far away from input photon, without them interacting. This concept can be extended to as many dimensions as possible.

By achieving this, the research team has demonstrated that a quantum internet can be created in the future by transmitting large amounts of information. Anton Zeilinger, a scientist at Austrian Academy of Sciences and the University of Vienna said that the result will help in the connection of quantum computers having information capacities greater than qubits.
Chinese researchers also find immense potential in the field of multidimensional quantum teleportation. Jian-Wei Pan, University of Science and Technology of China said that their research will be the foundation for a quantum network system that can be built in the future. Pan presented his points at the University of Vienna and the Academy recently.
Quantum physicists in the future will also try to demonstrate the teleportation of the entire quantum state of one photon or atom.
Research Paper: Quantum Teleportation in High Dimensions



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