Quantum-enhanced interferometry with asymmetric beam splitters

TL;DR

This paper explores how asymmetric beam splitters can optimize phase sensitivity in quantum interferometry, identifying optimal conditions and comparing different quantum state schemes for enhanced measurement precision.

Contribution

It introduces optimal conditions for asymmetric beam splitters to maximize phase sensitivity and compares quantum state schemes for interferometry.

Findings

Optimal transmission ratio and phase conditions identified

Asymmetric beam splitters can improve sensitivity with certain quantum states

Comparison shows advantages of specific quantum state combinations

Abstract

In this paper, we investigate the phase sensitivities in two-path optical interferometry with asymmetric beam splitters. Here, we present the optimal conditions for the transmission ratio and the phase of the beam splitter to gain the highest sensitivities for a general class of non-classical states with parity symmetry. Additionally, we address the controversial question of whether the scheme with a combination of coherent state and photon-added or photon-subtracted squeezed vacuum state is better or worse than the most celebrated one using a combination of coherent state and squeezed vacuum state.