Radio detection and ranging (radar) and light detection and ranging (lidar) are measurement procedures for recording high-resolution environmental and ranging information in real time. The sensor measures the distance with radio waves (radar) or laser light (lidar). The decisive parameters for such sensor systems are range and resolution. An invention from Paderborn University provides quantum optical support for radar/lidar systems. It uses quantum mechanical effects to exceed the theoretical resolution limits of a classic sensor. The central element is a quantum pulse gate (QPG) in which several optical signals are superimposed. The advantages are that measurement precision is no longer subject to the Rayleigh limit and that the system is much more robust in operation than other quantum sensor systems that use entangled photons.