Quantum physics enables revolutionary imaging method Researchers have developed a fundamentally new quantum imaging technique with strikingly counter-intuitive features. For the 1st time, an #image has been obtained #without ever #detecting the #light that was used to illuminate the imaged object, while the light revealing the image #never #touches the imaged object. #METHOD: The object (e.g. contour of a cat) is illuminated with light that remains undetected. The light that forms an image of the cat on the camera never interacts with it. >>they used #entangled pairs of photons, created when a laser interacts with a non-linear crystal. ~The laser illuminates 2 separate crystals, creating one pair of twin photons (1 infrared photon and a sister red photon) in either crystal. ~ object is placed in between the two crystals. If a photon pair is created in the 1st crystal, only the IR photon passes through the imaged object. Its path then goes through the 2nd crystal where it fully combines with any IR photons that would be created there. >>With this crucial step, there is now, no possibility to find out which crystal actually created the photon pair + no info in the IR photon about the object. BUT due to the quantum correlations of entangled pairs the info about the object is now in the red photons (although they never touched the object). >>Bringing together both paths of the red photons (from the 1st and 2nd crystal) creates bright and dark patterns, which form exact image of the object. >> all of the IR photons are discarded; the picture is obtained by only detecting the red photons that never interacted with the object. The camera used in the experiment is even blind to the infrared photons that have interacted with the object. #CONC: this new imaging concept is very versatile and could even enable imaging in the important #mid-infrared #region. It could find applications where low light imaging is crucial, in fields such as #biological or #medical imaging. eurekalert.org/pub_releases/2014-08/uov-qpe082814.php
Posted on: Thu, 28 Aug 2014 17:14:58 +0000
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