Quantum Metrology with Two-Mode Squeezed Vacuum: Parity Detection Beats the Heisenberg Limit

TL;DR

This paper demonstrates that using two-mode squeezed vacuum and parity detection in a Mach-Zehnder interferometer achieves super-resolution and sub-Heisenberg phase sensitivity, surpassing traditional limits.

Contribution

It introduces a novel approach combining two-mode squeezed vacuum with parity detection to enhance phase measurement sensitivity beyond the Heisenberg limit.

Findings

Super-resolution achieved with phase dependence evolving faster than traditional schemes

Sub-Heisenberg sensitivity with phase uncertainty better than 1/<n>

Parity detection enables surpassing standard quantum limits in interferometry

Abstract

We study the sensitivity and resolution of phase measurement in a Mach-Zehnder interferometer with two-mode squeezed vacuum (<n> photons on average). We show that super-resolution and sub-Heisenberg sensitivity is obtained with parity detection. In particular, in our setup, dependence of the signal on the phase evolves <n> times faster than in traditional schemes, and uncertainty in the phase estimation is better than 1/<n>.