A novel approach of macroscopic N-fold superresolution using phase-controlled divided signals

Abstract

Although quantum sensing theoretically offers an N-fold fringe enhancement at the Heisenberg limit, its practical realization has been limited by the difficulty of achieving high-order N in N00N states. Furthermore, quantum sensing systems are highly vulnerable to losses, especially in remote target detection applications. To address these challenges, I introduce a novel approach that enables potentially unlimited, N-proportional superresolution for laser-based remote sensing, even in lossy environments. This method builds upon new physics of quantum sensing rooted in the wave nature of photons. In particular, it employs the intensity product of N-divided signals with N phase controls. As a result, this approach opens the door toward achieving unrestricted N-fold superresolution in the macroscopic regime - surpassing both classical sensors constrained by first-order intensity correlations and conventional quantum sensors limited by N00N state requirements.