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Created a prototype quantum radar
18.07.2021
Physicists from the Austrian Institute of Science and Technology and colleagues from the US, UK and Italy have created a prototype radar that uses quantum entanglement to detect an object. This technology may find application in biomedical scanners with ultra-low power consumption in the future.
The researchers introduced a technology called microwave quantum illumination based on entangled photons. In quantum entanglement, two particles stay connected no matter how far apart they are. This allows the radar to operate even in high thermal noise environments where classical systems are often ineffective.
Scientists entangled photons at a temperature a few thousandths of a degree above absolute zero (-273,15 degrees Celsius). One group of photons, called signal ones, was sent to the object, and above the other group - idler photons - measurements were taken under conditions without interference and noise. When the signal photons bounce off the object, the entanglement is destroyed, but the correlation remains, which can be used to determine the presence or absence of the target object.
Testing of the prototype showed that it can detect an object with low reflectivity at room temperature. Quantum illumination solves the low sensitivity of radar systems, which have difficulty distinguishing radiation reflected from an object from natural background noise.