Physicists Ho-Tsang Ng and Sougato Bose of the University College London have recently proposed a method to generate entangled light using a Bose-Einstein condensate trapped in an optical cavity. If the system works, it would enable researchers to control the degree of entanglement. Entangled light, which is regarded as the ideal entity for sharing entanglement between distant parties, has many future applications in quantum communications. Ng and Bose's study is published in the New Journal of Physics.
"I would say that the significance of the work is two-fold: firstly, it provides an immediate application of a novel setup (namely the BEC in a cavity) that has been recently realized in experiments," Bose told PhysOrg.com. "Secondly, it is the application of a mesoscopic system to do something which is normally done using a macroscopic system such as a crystal."
A Bose-Einstein condensate (BEC) is a group of atoms that are cooled to near absolute zero, which causes the atoms' wavelengths to increase and overlap so that the group acts like a single atom. Although the atomic cluster has a relatively large size, it's considered to be a single quantum state and it obeys quantum laws.

(PhysOrg)