Optimal quantum phase estimation with generalized multi-component cat states
Seung-Woo Lee, Su‐Yong Lee, Jaewan Kim · arXiv (Cornell University) · 2020
We are interested in detecting the presence of a nearby object which is phase-sensitive, where a traveling light works out under a low photon loss rate. Here we investigate the optimal quantum phase estimation with generalized multi-component cat states. We show the optimal conditions of the generalized multi-component cat states for the phase estimation in a lossless scenario. We then demonstrate that the generalized multi-component cat states beat the performances of a NOON state in the presence of small loss, while maintaining the quantum advantage over the standard quantum limit which is attainable by coherent states. Finally, we propose a generation scheme of the entangled multi-component cat states with current or near-term optical technologies.