The methodology behind constructing a quantum channel between Space and Earth got a big boost as a research team, led by Paolo Villoresi and Cesare Barbieri from Padova University, have been able to identify individual returning photons after firing and reflecting them off of a space satellite in orbit almost 1,500 kilometres above the earth.
They say their work improves the feasibility of building a completely secure channel for global communication, via satellites in space, using quantum mechanics.
The research team fired photons directly at the Japanese Ajisai Satellite and have been able to prove that the photons received back at the Matera ground-based station, in southern Italy, are the same as those originally emitted.
This news will be welcomed by communication companies, banks, and MI5-types worldwide as it paves the way for quantum-encrypted communication - the only form of communication that could ensure beyond any doubt that there are no eavesdroppers.
Until now, quantum-encrypted communication has only been proven possible at distances up to about 150 kilometres, either down optical fibres or via telescopes. When sent down optical fibres, photons are dissipated due to scattering and adsorption and, when using telescopes, photons are subject to interfering atmospheric conditions.
Anton Zeilinger, 2008 winner of the Institute of Physics’ premier award, the Newton Medal, was involved in the research. The team now believes that Space-to-Earth quantum communication is possible with available technology.
The scientists write, “We have achieved significant experimental results towards the realization of a quantum communication channel, as well as how to actually adapt an existing laser ranging facility for quantum communication.”
The team will now be furthering the research by making it possible to emit and receive quantum keys, uncrackable strings of 1s and 0s that enable quantum communication from an active sender in space. Very recently, the Italian Space Agency has funded the initial phase of this project.
Article: Paolo Villoresi, Thomas Jennewein, Fabrizio Tamburini, Markus Aspelmeyer, Cristian Bonato, Rupert Ursin, Claudio Pernechele, Vincenza Luceri, Giuseppe Bianco, Anton Zeilinger and C Bonato, 'Experimental verification of the feasibility of a quantum channel between space and Earth', New Journal of Physics, April 2008