High-Precision Distributed Sensing Using an Entangled Quantum Network

(Phys.org) Researchers at the Technical University of Denmark and the University of Copenhagen have recently carried out an experiment investigating the advantages of using an entangled quantum network to sense an averaged phase shift among multiple distributed nodes. Their paper introduces a series of techniques that could help to collect more precise measurements in a variety of areas.
In the future, the techniques demonstrated by Borregaard, Guo and their colleagues could have important implications for a number of different areas of research and technology development. For instance, they could help to enhance the sensitivity of molecular tracking tools, atomic clocks, and optical magnetometry techniques.
Further investigations will determine how much each of these applications can benefit from the methods introduced by the researchers, this recent study offers valuable insight into how quantum-enhanced metrology can be achieved using readily available technologies, such as squeezed light generation and homodyne detection. In their future work, the researchers plan to continue investigating the use of multi-mode squeezed light in other contexts, in particular for optical quantum computing applications.