Quantum-enhanced metrology with large Fock states

Understand

Quantum metrology uses non-classical states, such as Fock states with a specific number of photons, to achieve an advantage over classical sensing methods.

• Typically, quantum metrological performance can be enhanced by increasing the involved excitation numbers, for example, by using large photon-number Fock states.
• However, manipulating these states and demonstrating a quantum metrological advantage is experimentally challenging.
• Here we present an efficient method for generating large Fock states approaching 100 photons within a superconducting microwave cavity through the development of a programmable photon number filter.