Quantum Physics Can Make An Unjammable Radar

Radar has been the way to spot enemy aircraft zooming across the sky for decades, but (un)fortunately, it doesn't always work. If you've got the right tech, you can fool it. A new kind developed by researchers at the University of Rochester however, dips into quantum physics and is unjammable and infallible.

There are a couple of ways to fool radar. First you can just drop a bunch of chaff to generate a whole bunch of noise, or you can take the more technologically complicated route and intercept the radar signal, modify it, and send back false information that looks real. It's that second tactic quantum radars are most interested in foiling.

Essentially this system uses polarised photons to detect and image objects meaning that if someone tried to intercept these photons and send them back, their polarisation would be changed; there's no way to look at the signal without everyone knowing. And it's not only that you know; the interference is easy to spot and throw out, resulting in a clean image.

So far the system still has its kinks that need to be worked out, but much like quantum cryptography, it promises a layer or theoretical security unlike anything we have now. Get ready for a quantum future, where everyone can see you see them. [Engadget]

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    Would be funny if an attacking air raid created a compromised image of the troll face. Prblm?
    Also, there's little point having a radar if you cannot defend yourself. Now scientists need to create a quantum gun. Now THAT would be cool!

    I'm not sure it actually does allow you to clean the 'image' at all. Sounds like it just lets you know you're being messed with which is better than not knowing, but still leaves you somewhat in the dark.

      Why are you unsure it allows you to clean the image? If you can determine polarised v non-polarised photons you can just scrub them from the signal, leaving remnants of the original.

      No, radar signal is reflected back regardless. All that the masking technique does is sends back another signal ontop of the reflection to mask the reflection. By polarizing the photons the system can recognize that the photons are not of the same pilarization and ignore that data, leaving you with only the reflected data.

    Sounds Magic. However it actually works.... Were only being told what the smart people want u to hear.... If this was new and if it was so amazing it would be classified.

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