She is working on focusing the transmitted beam into a much smaller area, so that less energy is lost along its way.

ECONOMIST: Archaeology

We took down a mirror above her mantelpiece because we were told that a beam could be transmitted into the room to listen to a conversation in that room.

BBC: Full text: Burrell interview

The information from the beam-splitter is then transmitted separately to the recipient, so that he knows whether to accept C unaltered as part of the message, or apply one of three mathematical transformations to it, to arrive at the right result (this does not compromise secrecy, since any eavesdropper will not know what the transformation needs to be applied to).

ECONOMIST: Quantum information technology

Information about each layer is transmitted from the computer to a laser beam, which melts the PCL into a 3-D structure.

CNN: 3-D printer helps save dying baby