Photon echoes may extend quantum transmission distances
Quantum cryptography is a promising new way to send encrypted information. This new technology does suffer from some drawbacks. One of the toughest problems is the range that information can be sent is limited to around 50-100 km. Advancements have been underway. The most promising advancement is being working on by a team based out of the Australian National University. They found a way to store and manipulate photons to be used as a memory device.