This nonlocal interaction was initially described by Einstein as “Spooky action at a distance.” Recently, physicists from Griffith’s Centre for Quantum Dynamics in Australia have determined a way to use this action to ensure the security of quantum networks.
This theory is an important part of developing quantum networks through which quantum computers could be linked. For a quantum link in such a network to be deemed viable and secure, the presence of quantum nonlocality between particles at either end would have to be confirmed.
Quantum networks are prone to failing this test because a large portion of photons are absorbed or scattered when you send them through something like an optical fiber channel, and a photon cannot pass the test if it is lost while it is being measured.
To get past the hurtle of photon loss, the team selected a few photons that survived a high-loss channel and moved them to a different quantum channel via quantum teleportation – a process made possible by high-efficiency photon source and detection tech.
If these results can be replicated outside of the lab, researchers could be able to build the networks that would connect quantum computers.
A quantum internet could usher in far more secure digital communications, affording individuals and governments more protections for their information.