Introducing a novel Z_4n-detection scheme to enhance the performance of quantum LiDAR systems

In a quantum LiDAR system, to achieve a better resolution and sensitivity, detection scheme plays an important role. We propose a novel detection scheme in which the photo detector considers only the 4n number of photons, where n in mathbb{N}, as a click and the rest of them as a no-click. Similar to the Z-detection scheme, where we get a click for any number of photons, we termed this measurement as Z_4n-detection scheme. By employing superposition of four coherent states (SFCS) and vacuum as input we investigate the performance of Mach-Zehnder interferometer (MZI) based quantum LiDAR systems. We found a significant enhancement in resolution and broader working point for the phase sensitivity in comparison to the Z-detection scheme. Our findings highlight the advantages of our approach and suggest promising advancements in the field of quantum LiDAR sensing technology, providing a pathway for more accurate and sensitive measurement capabilities.