Using Quantum Entanglement to Remotely Synchronise Clocks

Distant clock synchronisation has many applications including telecommunications, Global Satellite Navigation Systems, emitter localisation, and phased array astronomy. Clock synchronisation requires clocks to tick at the same rate and to read the same time. Two procedures employed to ensure clocks read the same time are the Einstein method and the Eddington method.

The Einstein method involves sending a signal back and forth between two clocks and using the speed of the signal to synchronise the clocks.

The Eddington method involves synchronising the clocks next to each other prior to sending the second clock to its desired location.

Special relativity and general relativity must be accounted for in the Einstein and Eddington methods to ensure that the clocks run at the same rate. Furthermore, the Eddington method relies on the physical movement of a clock and is therefore not practical for space applications. This project will investigate the employment of entangled photon pairs in overcoming the limitations of the Einstein and Eddington methods.


Project Leader:
Dr James Quach, The University of Adelaide

PhD Student:
Sabrina Slimani, The University of Adelaide