Scientists demonstrate quantum radar prototype

Science Daily  May 8, 2020
Instead of using conventional microwaves, an international team of researchers (Austria, UK. USA – MIT, Italy) entangled two groups of photons, which are called the ‘signal’ and ‘idler’ photons. The ‘signal’ photons are sent out towards the object of interest, whilst the ‘idler’ photons are measured in relative isolation, free from interference and noise. When the signal photons are reflected back, true entanglement between the signal and idler photons is lost, but a small amount of correlation survives, creating a signature or pattern that describes the existence or the absence of the target object — irrespective of the noise within the environment. Using entanglement generated at a few thousandths of a degree above absolute zero (-273.14 °C), they were able to detect low reflectivity objects at room-temperature. The technology has potential applications for ultra-low power biomedical imaging and security scanners…read more. Open Access TECHNICAL ARTICLE