Phase estimation in lossy optical interferometry without a reference beam
Quantum Physics
2025-06-02 v1
Abstract
We investigate phase estimation in a lossy interferometer using entangled coherent states, with particular focus on a scenario where no reference beam is employed. By calculating the quantum Fisher information, we reveal two key results: (1) the metrological equivalence between scenarios with and without a reference beam, established under ideal lossless conditions for the two-phase-shifting configuration,breaks down in the presence of photon loss, and (2) the pronounced inferior performance of entangled coherent states relative to NOON states, observed in the presence of a reference beam, disappears in its absence.
Cite
@article{arxiv.2505.24770,
title = {Phase estimation in lossy optical interferometry without a reference beam},
author = {Jun Tang and Dong-Qing Wang and Wei Zhong and Lan Zhou and Yu-Bo Sheng},
journal= {arXiv preprint arXiv:2505.24770},
year = {2025}
}
Comments
7 pages, 2 figures