Science Alert December 29, 2022
Instead of lasers and mirrors, researchers in Finland proposed the concept of coherent interaction-free detection and demonstrated it experimentally using a three-level superconducting transmon circuit to detect an electromagnetic wave pulsed into a chamber. They showed that it is possible to ascertain the presence of a microwave pulse resonant with the second transition of the transmon, while at the same time avoid exciting the device onto the third level. Experimentally, this was done by using a series of Ramsey microwave pulses coupled into the first transition and monitoring the ground-state population. The protocol can be applied to quantum computing, optical imaging, noise detection and cryptographic key distribution. According to the researchers this can be regarded as a highly efficient way of extracting information without disturbing the functioning of the quantum processor…read more. Open Access TECHNICAL ARTICLE
Coherent interaction-free detection. Credit: Nature Communications volume 13, Article number: 7528 (2022)Â