A Machine-Designed Sensor to Make Optimal Use of Entanglement-Generating Dynamics for Quantum Sensing

TL;DR

This paper introduces a machine-optimized quantum sensing protocol that enhances sensitivity by dynamically generating entanglement during measurement, surpassing traditional static schemes using the same resources.

Contribution

It presents a novel machine-designed sequence of rotations that generate useful entanglement during interrogation, improving sensitivity over traditional methods.

Findings

Achieves higher sensitivity than traditional schemes with same resources.

Uses machine optimization to design dynamic entanglement generation.

Applicable to various quantum sensors like clocks and magnetometers.

Abstract

We use machine optimisation to develop a quantum sensing scheme that achieves significantly better sensitivity than traditional schemes with the same quantum resources. Utilising one-axis twisting dynamics to generate quantum entanglement, we find that rather than dividing the temporal resources into seperate "state-preparation" and "interrogation" stages, a complicated machine-designed sequence of rotations allows for the generation of metrologically useful entanglement while the parameter is interrogated. This provides much higher sensitivities for a given total time compared to states generated via traditional one-axis twisting schemes. This approach could be applied to other methods of generating quantum-enhanced states, allowing for atomic clocks, magnetometers, and inertial sensors with increased sensitivities.