Physics World August 7, 2019
All demonstrations of teleportation to date were limited to a two-dimensional subspace−so-called qubit−of the quantized multiple levels of the quantum systems. In general, a quantum particle can naturally possess not only multiple degrees of freedom, but also, many degrees of freedom can have high quantum number beyond the simplified two-level subspace. Making use of multiport beam-splitters and ancillary single photons, an international team of researchers (China, Austria) propose a resource-efficient and extendable scheme for teleportation of arbitrarily high-dimensional photonic quantum states. Experimentally they have demonstrated teleportation of a qutrit, which is equivalent to a spin-1 system. Measurements over a complete set of 12 states in mutually unbiased bases yield a teleportation fidelity of 0.75 and the fidelity exceeds the limit of 2/3. The research adds to the toolbox for teleporting a quantum particle intact. The results pave the way for quantum technology applications in high dimensions and quantum networks…read more. Open Access TECHNICAL ARTICLE
Credit: Courtesy: C-Y Lu