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Here, we review some quantum architectures designed for the engineering ofthe N00N state, a bipartite maximally entangled state crucial in quantummetrology applications. The fundamental concept underlying these schemes is thetransformation of the initial state $|N\rangle \otimes |0\rangle$ to the N00Nstate $\frac{1}{\sqrt{2}} (|N\rangle \otimes|0\rangle +|0\rangle\otimes|N\rangle)$, where $|N\rangle$ and $|0\rangle$ are the Fock states with$N$ and $0$ excitations. We show that this state can be generated as asuperposition of modes of quantum light, a combination of light and motion, ora superposition of two spin ensembles. The approach discussed here can generatemesoscopic and macroscopic entangled states, such as entangled coherent andsqueezed states, as well. We show that a large class of maximally entangledstates can be achieved in such an architecture. The extension of these stateengineering methods to the multi-mode setting is also discussed.

High--N00N State Generation: N00N State Output of Floquet Engineering