Labour and Demographic Economics. Abstract There are many kinds of quantum light source, each producing a distinct kind of quantum light. Atmospheric turbulence and orbital angular momentum of single photons for optical communication. For librarians and administrators, your personal account also provides access to institutional account management. Reprints and Permissions. The electrons then recombine with the atoms, releasing photons that have much higher frequencies than the original laser light. Skip to main content Thank you for visiting nature. Peer review Peer review information Nature Physics thanks Hugo Defienne and Andrew Forbes for their contribution to the peer review of this work. Photons are often referred to as flying quantum bits, a phrase that emphasizes both their quantum character and their ability to carry quantum information between two distant points. Sorry, a shareable link is not currently available for this article.