To find an object’s location, a radar system detects both the object’s distance and the direction in which it lies. To do that, the system transmits radio waves and then measures returning waves that have bounced back off the object. Now, Lorenzo Maccone of the University of Pavia in Italy and Changliang Ren of the Chongqing Institute of Green and Intelligent Technology in China propose a method that uses entangled photons as radar probes. They say that their method could allow for more precise position measurements.
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