Quantum communication system having quantum key distribution and using a midpoint of the talbot effect image position and associated methods

A method of operating a quantum communications system comprising a communications system and a quantum key distribution (QKD) system operable therewith, the QKD system comprising a transmitter node, a receiver node, and a quantum communications channel coupling the transmitter node and receiver node, the method comprising:

• operating the transmitter node to cooperate with the quantum communications channel to define a Talbot effect image position along the quantum communications channel;
• and
• operating the receiver node to be located along a midpoint of the quantum communications channel at the Talbot effect image position.