Quantum negativity can enhance metrology

Researchers including ITAMP Fellow Nicole Yunger Halpern recently proved that quantum physics can enhance metrology, if a simple extra measurement is performed during an experiment. The proof technique hinges on mathematical objects that resemble probabilities but that can assume negative values when describing quantum systems. The result was published in Nature Communications and featured in a news article by the University of Cambridge.

Here is the link to the news article:
https://www.cam.ac.uk/research/news/quantum-negativity-can-power-ultra-p...