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China Says It's Building a "Ghost Imaging" Satellite to Detect Stealth Jets

This in turn would delay the ability of command centers, air defense headquarters, or other elements to examine the information and initiate an appropriate response. And these are just the systems we know about. But perhaps most importantly, the underlying science remains largely theoretical. Xiong Jun, a professor of physics who studied quantum optics at Beijing Normal University, told the South China Morning Post that a space-based ghost imaging sensor relying on natural light would need to scan the entire target area in nanoseconds to create an accurate picture. If it used a laser as in typical laboratory setups, the system could need a substantial amount of power to make sure the beams of light could even reach the target area from orbit, he added. The same issues could apply to a ground-based system using similar physics principles. In September 2016, China Electronics Technology Group Corporation (CETC) claimed it had developed a so-called counter-stealth "quantum radar." A traditional radar emits a beam of electromagnetic energy, which then bounces off the target, registering their position. A quantum radar does the same thing, but with streams of quantum entangled photons, which existing radar absorbent materials and low observable features would not be able to defeat. In theory, the light particles might even be able to record other aspects of the object, including the density of its component materials.

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