In a new study, researchers from Orange and Toshiba Europe show that a quantum data channel and classical optical signals can both propagate in the same fiber for several tens of kilometers with a low error rate. The new approach could reduce the cost of implementing quantum key distribution (QKD) for secure data transmission by allowing QKD to be used in already deployed networks.
Click here for original story, Researchers demonstrate co-propagation of quantum and classical signals
Source: Phys.org