Gas memory could send spooky messages the full distance
Quantum entanglement, which Einstein dubbed "spooky action at a distance", would be the perfect way to communicate data – if technical hurdles could be overcome.
The method involves linking the quantum properties of two objects such that a change to one is instantly reflected in the other – offering a whole new way to transmit information from opposite sides of the globe.
Entanglement has already been exploited as a way to securely share pass phrases for secret communications, but only over distances of less than 200 kilometres. The inability of the gas-based quantum computer memory used to hold onto information for more than a fraction of a second is to blame.
Now a way to have that memory store quantum information for longer opens up the possibility of entangled communication over 1000 kilometres.