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

Abstract

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

31 pages, 6 figures