We propose a general and feasible approach to realize a large number of squeezed spatial modes. This is achieved by manipulation of paraxial diffraction such that the critical wave components with most significant squeezing contribute in-phase to the spatial squeezing. As an example, we then demonstrate that it is possible to achieve localized squeezing of ∼ −1.51 dB at an area 102 μm2 within a homogeneously squeezed spatial regime of wp = 1 mm2 using four-wave mixing (FWM) based on current experimental settings, corresponding to approximately 104 squeezed spatial modes, which is > 102 larger in number of squeezed modes and also ∼ 6 times stronger in squeezing as compared to that obtained in the state-of-the-art experiment. We also show that the obtained extremely localized squeezed light can be directly applied to enhance the signal-to-noise ratio in quantum imaging of weakly absorbing objects by a factor of ∼ 3.5 at a spatial resolution of d ∼ 1 mm where d is the detector size.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics