Quantifying Nonclassicality via the Precision in Quantum Metrology

The nonclassical properties of quantum states are of tremendous interest due to their potential applications in future technologies. It has recently been realized that the concept of a “resource theory” is a powerful approach to quantifying and understanding nonclassicality. An important goal in this endeavor is to find resource theoretic measures of nonclassicality that are “operational”, meaning that they also quantify the ability of quantum states to provide enhanced performance for specific tasks, such as precision sensing. In this talk, I will present an operational resource theoretic measure that makes a strong connection between nonclassicality and metrological power. I will also show that a balanced Mach-Zehnder Interferometer provides a way to experimentally extract this measure.