Sensing using higher order NOON states offers a path to scalable improvement of signal to noise ratio beyond classical limit. In this work we propose a novel scheme for on-chip generation of superradiant NOON states
We propose a method to generate path-entangled NOON-state photons from quantum dots and coupled nanocavities. In the systems we considered, cavity mode frequencies are tuned close to the biexciton two-photon resonance. Under appropriate conditions, the system can have the target NOON state in the energy eigenstate, as a consequence of destructive quantum interference. The NOON state can be generated by a resonant laser excitation. This method, first introduced for a two-photon NOON state (N=2), can be extended toward a higher NOON state (N>2) based on our recipe, which is applied to the case of N=4 as an example.
Superradiance offers an efficient approach for coupling discrete quantum emitters via collective fluorescence. In this work, we suggest a method for the controlled coupling and synchronization of distant integrated photonic emitters using superradiance. Our theoretical modeling and analysis using electromagnetic and Master Equation methods for a case of nanodiamond/SiN heterogenous photonic platform confirms efficient superradiant coupling of distant emitters and a good degree of spurious emission isolation. This approach can offer a path to the scalable generation of multipartite photonic states, such as NOON states, and can enable efficient cluster state generation and one-way quantum computing approaches.