Driving enhanced quantum sensing in partially accessible many-body systems

TL;DR

This paper proposes a method to enhance quantum sensing in many-body systems with partial access by periodically driving the Hamiltonian, achieving super-Heisenberg scaling through steady-state dynamics.

Contribution

It introduces a novel approach of using periodic driving and local steady states to surpass traditional sensing limits in partially accessible quantum many-body systems.

Findings

Steady-state sensing outperforms ground state sensing with partial access.

Super-Heisenberg scaling achieved at low frequencies.

Method applicable to all integrable models and feasible on current quantum devices.

Abstract

The Ground-state criticality of many-body systems is a resource for quantum-enhanced sensing, namely the Heisenberg precision limit, provided that one has access to the whole system. We show that for partial accessibility, the sensing capabilities of a block of spins in the ground state reduces to the sub-Heisenberg limit. To compensate for this, we drive the hamiltonian periodically and use a local steady-state for quantum sensing. Remarkably, the steady-state sensing shows a significant enhancement in precision compared to the ground state and even achieves super-Heisenberg scaling for low frequencies. The origin of this precision enhancement is related to the closing of the Floquet quasienergy gap. It is in close correspondence with the vanishing of the energy gap at criticality for ground state sensing with global accessibility. The proposal is general to all the integrable models and can be implemented on existing quantum devices.