Fundamental quantum limits in ellipsometry

TL;DR

This paper determines the fundamental quantum limits of measurement accuracy in optical ellipsometry and demonstrates how quantum states like squeezed states can surpass standard limits to reach the Heisenberg limit.

Contribution

It establishes the ultimate quantum bounds in ellipsometry and shows how non-classical light states can improve measurement precision beyond classical limits.

Findings

Standard quantum limit can be surpassed with squeezed states.

Tailored beams can reach the Heisenberg limit.

Quantum theory sets fundamental bounds on ellipsometry accuracy.

Abstract

We establish the ultimate limits that quantum theory imposes on the accuracy attainable in optical ellipsometry. We show that the standard quantum limit, as usual reached when the incident light is in a coherent state, can be surpassed with the use of appropriate squeezed states and, for tailored beams, even pushed to the ultimate Heisenberg limit.