Quantum Metrology (IMAGE) University of Cambridge Caption Quantum laser light is shone onto a chemical molecule that we wish to measure. Then the light passes our "magic" quantum filter. This filter discards a lot of light, whilst condensing all useful information in weak light that finally reaches the camera detector. Credit Hugo Lepage Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.