Enhanced Two-Parameter Phase-Space-Displacement Estimation Close to Dissipative Phase Transition

TL;DR

This paper introduces a quantum sensor leveraging driven-dissipative systems to enhance the joint estimation of phase space displacements, especially near dissipative phase transitions, surpassing standard quantum limits.

Contribution

It presents a novel quantum sensing method using a lattice system with atoms and bosonic modes near a dissipative phase transition for improved parameter estimation.

Findings

Sensitivity to displacement phase can be significantly enhanced near the phase transition.

Sum of uncertainties in the two parameters can surpass the standard quantum limit.

Steady state exhibits non-analytical behaviour at the phase transition.

Abstract

I propose a quantum sensor based on driven-dissipative quantum system for the joint estimation of two conjugated variables characterizing the phase space displacement. The quantum probe consists of lattice system with two level atoms and bosonic modes which interact via dipolar coupling. Interplay between the coherent dynamics and dissipative processes of losses of bosonic excitations leads to a steady state which exhibits a non-analytical behaviour. I show that close to the dissipative phase transition the sensitivity of one of the conjugated parameters either the magnitude of the phase of the displacement can be significantly enhanced. Moreover, I show that the sum of the measurement uncertainties of the two parameters can overcome the standard quantum limit.