“In simple special cases with two photons, it is already possible to control such systems in the laboratory. With the help of our computer algorithm Melvin, we have found a generalization that allows us to manipulate constellations of several photons. Our light particles are entangled in several dimensions due to different wavelengths or spatial structure and can thus code for more than one bit of information. It should also be possible to implement this new approach in the laboratory in the foreseeable future, at least for entanglements in three to four dimensions,” says Mario Krenn, one of the authors of the publication, who researches for (amongst others) the Institute for Quantum Optics and Quantum Information
of the ÖAW and who currently works at the University of Toronto.