Two U.S. Army research projects at the University of Chicago advance quantum networking, which will play a key role in future battlefield operations.
Quantum networks will potentially deliver multiple novel capabilities not achievable with classical networks, one of which is secure quantum communication. In quantum communication protocols, information is typically sent through entangled photon particles. It is nearly impossible to eavesdrop on quantum communication, and those who try leave evidence of their tampering; however, sending quantum information via photons over traditional channels, such as fiber-optic lines, is difficult – the photons carrying the information are often corrupted or lost, making the signals weak or incoherent.
In the first project, the University of Chicago research team, funded and managed by the U.S. Army’s Combat Capability Development’s Army Research Laboratory’s Center for Distributed Quantum Information, demonstrated a new quantum communication technique that bypasses those traditional channels. The research linked two communication nodes with a channel and sent information quantum-mechanically between the nodes—without ever occupying the linking channel.
“This result is particularly exciting not only because of the high transfer efficiency the team achieved, but also because the system they developed will enable further exploration of quantum protocols in the presence of variable signal loss,” said Dr. Sara Gamble, program manager at the lab’s Army Research Office and co-manager of the Center for Distributed Quantum Information. “Overcoming loss is a key obstacle in realizing robust quantum communication and quantum networks.”