In an experiment which can be considered path-breaking, China's Micius satellite beamed back messages to two earth receiving stations which is said to be 'unbreakable', or in plain-speak, a message which would make eavesdropping impossible!
Though the concept is not new, there had been limitations on its broadcast on earth based communication systems as the the maximum distance covered had been under 200 km, but transmission from space has extended that range to more than 1200 kms in the experiment.
The message is said to be 'protected' exploiting quantum physics using entangled photons which are,
sub-atomic particles of light manipulated so that some of their key properties are dependent on each other.
Which basically means that if there is an attempt to eavesdrop on the message, it would create detectable changes as the laws of quantum physics has established that any attempt to measure the properties of these photons, changes these properties permanently!
The Chinese satellites have complicated optical systems where this property is exploited,
By encoding a key to encrypt data using entangled photons, it becomes possible to send messages confident that they have reached a recipient free of interference.
For privacy buffs, this new tech could be seen as a savior if incorporated into our 'open' communication systems we are used to today and which can be easily eavesdropped on. But for others, it might be seen as a tech which could be exploited by the 'super secretive', for whom this will be a godsend.
So watch this space in the future!
Also check this video.
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