Quantum radar samples (via Quantum-Secured Imaging)
While it was Maxwell who predicted and described the physics of electromagnetic waves, it was Heinrich Hertz's experiments in his laboratory that found waves could be transmitted through certain materials, while other materials would reflect the waves back.
Nikola Tesla took this information one step further and predicted the general concept of radar in an article for Century magazine in June 1900, “Stationary waves... mean something more than telegraphy without wires to any distance... For instance, by their use we may produce at will, from a sending station, an electrical effect in a particular region of the globe; we may determine the relative position or course of a moving object, such as a vessel at sea, the distance traversed by the same, or its speed.” Although Tesla mentioned this, he was way ahead of his time, radar systems were not even developed until 15 years later.
By the start of World War 2, many different countries built and used their own radar systems using the exact same principles as previously outlined by Tesla. As a result, numerous countries were using radar systems, and scientist and researchers began experimenting with countermeasures to block or destroy enemy radar signals. Various techniques were developed since that time, some of the most common include releasing chaff and electronic jamming. Electronic jamming could consist of spot jamming, sweep jamming, barrage jamming, pulse jamming ,or DRFM jamming. All which attempt to take the radar signal and manipulate it in some way in which a false or biased signal gets sent back.
Quantum radar error sampling (via Quantum-Secured Imaging)
Today, researchers are working with the power of quantum technology to overcome jamming techniques. Scientists at the University of Rochester have used quantum imaging to detect when a signal has been manipulated. They have found that by polarizing the photons before sending out the signals, any attempt to change or alter it would lead to a large amount of polarization errors when the signal has returned. The team also went on to state, “The system can be easily realized and integrated into modern optical ranging and imaging systems.”
Although it may seem unjammable at the moment, there is always the possibility of somebody with a better understanding of quantum cryptographic systems cracking into this one. However, this technology is more secure and will probably be readily and cheaply integrated into modern systems. The technology will probably be adapted by the military soon (if not already).
I have one question; what country will need to use this tech, and who are they using it against? Most wars today are fought between the USA and EU allies against irregulars, small ill-equipped groups, and third world warlord. With uprisings, fighting between the later mentioned groups. Is it naive to think there will never be a war fought between two modern-advanced military nations again? I do believe WWII was the last time the world will clearly see a modern nation openly attacking another.