Super-Heisenberg scaling in a triple point criticality

TL;DR

This paper demonstrates that by using adiabatic protocols near a triple point criticality, it is possible to achieve exponential super-Heisenberg scaling in quantum metrology, surpassing traditional limits.

Contribution

The authors introduce a novel adiabatic evolution protocol around a triple point that enables exponential super-Heisenberg scaling in quantum measurement precision.

Findings

Exponential super-Heisenberg scaling achieved with optimized adiabatic protocols.

Scaling degrades to sub-Heisenberg if excitations are not effectively suppressed.

Proposed experimental scheme to realize the super-Heisenberg scaling.

Abstract

We investigate quantum-enhanced metrology in a triple point criticality and discover that quantum criticality can not always enhance measuring precision. We have developed suitable adiabatic evolution protocols approaching a final point around the triple point to effectively restrain excitations, which could accelerate the adiabatic evolutions and lead to an exponential super-Heisenberg scaling. This scaling behavior is quite valuable in practical parameter estimating experiments with limited coherence time. The super-Heisenberg scaling will degrade into a sub-Heisenberg scaling if the adiabatic parameter modulations adopted can not reduce excitations and weaken the slowing down effect. Additionally, a feasible experimental scheme is also suggested to achieve the anticipated exponential super-Heisenberg scaling. Our findings strongly indicate that criticality-enhanced metrology can indeed significantly enhance measuring precision to a super-Heisenberg scaling when combining a triple point and beneficial parameter modulations in the adiabatic evolution, which will be conducive to the exploration of other super-Heisenberg scaling and their applications.