Quantum sensing in Kerr parametric oscillators

TL;DR

This paper explores how Kerr parametric oscillators can be utilized for quantum sensing by analyzing their phase space structure, leading to enhanced measurement precision through squeezing and quantum Fisher information, with relevance to experimental systems.

Contribution

It introduces a method to optimize control parameters in Kerr oscillators for quantum sensing, leveraging phase space analysis and excited-state quantum phase transitions.

Findings

Phase space analysis identifies parameters for optimal squeezing.

Quantum Fisher information can be amplified via excited-state quantum phase transitions.

Relevance demonstrated for exciton-polariton and superconducting systems.

Abstract

Quantum metrology and quantum sensing aim to use quantum properties to enhance measurement precision beyond what could be classically achieved. Here, we demonstrate how the analysis of the phase space structure of the classical limit of Kerr parametric oscillators can be used for determining control parameters values that lead to the squeezing of the uncertainty in position and the amplification of the quantum Fisher information. We also explore how quantum sensing can benefit from excited-state quantum phase transitions, even in the absence of a conventional quantum phase transition. The system that we consider models exciton-polariton condensates and superconducting circuits, making our study relevant for potential experimental applications.