Breakthrough in Quantum Communication Achieved by Tennessee Researchers

A team of researchers from the University of Tennessee at Chattanooga, Oak Ridge National Laboratory, and utility provider EPB have made significant strides in quantum communication by successfully transmitting quantum-entangled signals over a commercial network. This achievement marks a critical advancement in the development of a more secure quantum internet.

Quantum computing relies on quantum bits, or qubits, which can exist in multiple states simultaneously. This allows for advanced applications such as quantum teleportation, where information can be transmitted without physical movement. Researchers faced challenges in maintaining the polarization of light photons—used as qubits—during transmission due to environmental factors such as wind and temperature.

To address these issues, the researchers implemented a technique called automatic polarization compensation, which stabilizes light wave polarization during transmission. Joseph Chapman, a quantum research scientist at ORNL, noted that this method allows for continuous operation of the network without the need for periodic shutdowns, which has hindered previous attempts at stable quantum communication.

In trials conducted between nodes spaced half a mile apart, the researchers achieved uninterrupted quantum signal transmission, enhancing both performance and reliability. Their findings have led to a patent application for the technology, with ongoing efforts to increase bandwidth and further enhance the quantum network's capabilities.

"This accomplishment is a key step toward a fully operational quantum internet that can provide unprecedented levels of security and efficiency," said David Wade, CEO of EPB, highlighting the potential benefits for researchers and businesses.