Quantum 'spooky action at a distance' becoming practical—6 January 2018 

Scientists from the Australian Research Council (ARC) Centre of Excellence for Quantum Computation and Communication Technology and Griffith University have overcome a major challenge in applying a strange quantum effect to real applications.

The team based at Griffith University's Centre for Quantum Dynamics have demonstrated how to rigorously test if pairs of photons—particles of light—display Einstein’s “spooky action at a distance”, even under adverse conditions that mimic those outside the lab.

They demonstrated that the effect, also known as quantum nonlocality, can still be verified even when many of the photons are lost by absorption or scattering as they travel from source to destination through an optical fiber channel. The experimental study and techniques are published in the journal Science Advances.

Quantum nonlocality is important in the development of new global quantum information networks, which will have transmission security guaranteed by the laws of physics. These are the networks where powerful quantum computers can be linked.

Photons can be used to form a quantum link between two locations by making a pair of photons that are “entangled” – so that measuring one determines the properties of its twin – and then sending one along a communication channel.

Team leader and ARC Future Fellowship recipient, Professor Geoff Pryde, said a quantum link had to pass a demanding test that confirmed the presence of quantum nonlocality between particles at either end.

The team now aims to integrate their method into quantum networks that are being developed by the ARC Centre of Excellence for Quantum Computation and Communication Technology, and test it in real-life conditions.

Media Issued by Griffith University.


Image: Professor Geoff Pryde and Dr Morgan Weston led a study of Einstein’s ‘spooky action at a distance” effect.
Source: Griffith University Media.

Original Published Date: 
Monday, January 8, 2018