Robust Quantum Sensing in Strongly Interacting Systems with Many-Body Scars
Shane Dooley
Abstract
In most quantum sensing schemes, interactions between the constituent particles of the sensor are expected to lead to thermalization and degraded sensitivity. However, recent theoretical and experimental work has shown that the phenomenon of quantum many-body scarring can slow down, or even prevent, thermalization. We show that scarring can be exploited for quantum sensing that is robust against certain strong interactions. In the ideal case of perfect scars with harmonic energy gaps, the optimal sensing time can diverge despite the strong interactions. We demonstrate the idea with two examples: a spin-1 model with Dzyaloshinskii-Moriya interaction and a spin-1/2 mixed-field Ising model. We also briefly discuss some nonideal perturbations and the addition of periodic controls to suppress their effect on sensing.