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We show for the first time that it is possible to realize laser beam focusingat the few-photon level in the four-wave-mixing process, and at the same time,reducing the quantum uncertainty in width. The reduction in quantum uncertaintyresults directly from the strong suppression of local intensity fluctuations.This surprising effect of simultaneous focusing and reduction of widthuncertainty is enabled by multi-spatial-mode squeezing, and is not possible viaany classical optical approach or single-spatial-mode squeezing. Our resultsopen promising possibilities for quantum-enhanced imaging, bio-sensing andmetrology including measurements of nanometer displacement.

Beam focusing and reduction of quantum uncertainty in width at the few-photon level via multi-spatial-mode squeezing