Introducing a novel $Z_{4n}$-detection scheme to enhance the performance of quantum LiDAR systems

TL;DR

This paper introduces a $Z_{4n}$-detection scheme for quantum LiDAR that improves resolution and phase sensitivity by considering only photon counts that are multiples of four, enhancing measurement accuracy.

Contribution

The paper proposes a novel $Z_{4n}$-detection scheme using superposition of four coherent states, demonstrating significant improvements over traditional $Z$-detection in quantum LiDAR systems.

Findings

Enhanced resolution in quantum LiDAR with $Z_{4n}$-detection.

Broader phase sensitivity working point.

Significant performance improvement over $Z$-detection.

Abstract

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.