Quantum internet to keep spies at bay

摘要

Quantum networks are quietly spreading across the world. With secure quantum connections linking up cities, people can communicate in the knowledge that the laws of physics will prevent eavesdropping. Eventually, there may even be a global quantum internet. When former US National Security Agency contractor Edward Snowden uncovered the extent of government spying, that underlined the need for more secure communications, says Don Hayford of Battelle, a research organisation in Columbus, Ohio. "Even before Snowden we decided there were things coming up in the future that meant people should start looking at something better."