The quantum teleportation of information between photons from two fundamentally different light sources is demonstrated in Nature Communications this week. The findings open the possibilities for quantum technologies between different platforms.
Quantum teleportation is the transfer of information from one system into another, and it is important for building quantum networks. Light is a promising candidate for building quantum information systems and computers, but its properties are dependent on the source that generates it. Until now, any demonstration of quantum information transfer has used either one light source split into two or two identical sources. Mark Stevenson and colleagues overcome this apparent limitation by teleporting quantum information between photons from two dissimilar light sources. One source is a laser, while the second is an entangled-light-emitting diode; their bandwidths differ by a factor of 100. The interaction between them that allows for the information to be teleported is provided by a specially designed beam splitter -- an optical device that splits or combines light beams.
The findings show that it is possible to carry out quantum teleportation between entirely different light sources. This presents an interface for combining diverse optical systems into more practical and feasible quantum technologies.