All demonstrations of quantum teleportation so far have transferred the state of a qubit — a simple two-level system. This type of transfer is a far cry from teleporting particles in their complete quantum state, which involves multiple degrees of freedom, each with many possible values. Now, scientists from the University of Science and Technology of China, Hefei, and at the University of Vienna demonstrated the transfer of a 3D quantum state, or qutrit.
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The scheme may be useful in high-speed quantum communications, since a qutrit can carry more information than a qubit. The approach could be generalized to teleport quantum states involving any degree of freedom with more than two levels (photon orbital angular momentum, for example). The authors also suggest that they could extend their scheme to an arbitrarily high number of dimensions by adding more paths for the photons. These features could eventually allow the complete state of a complex quantum particle to be transferred.
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