U.S. Researchers Achieve Breakthrough in Quantum Internet Transmission Over Ordinary Cable
Researchers led by a team at the U.S. National Institute of Standards and Technology (NIST) have successfully transmitted entangled photons over 62 kilometers (38.5 miles) of ordinary fiber-optic cable without breaking their entanglement. This achievement marks a significant step towards the development of a quantum internet. The experiment was conducted using existing network cabling, much of which was strung above ground and exposed to environmental factors like wind, temperature changes, and vibrations from traffic. These conditions typically distort the quantum states of entangled particles. To overcome this interference, the researchers employed a laser light signal as a reference point, calculating its twisting to apply necessary corrections to the entangled photons. This method allowed for 92.8% of the operation time to be used for sending stabilized quantum information. The findings have been published in the Journal of Optical Communications and Networking. 
