Enhancing spin squeezing using soft-core interactions

TL;DR

This paper introduces a protocol for generating spin squeezed states in atomic systems with Rydberg interactions, leveraging soft-core potentials and external drives to enhance quantum metrology capabilities.

Contribution

It presents a novel method combining soft-core interactions and external drives to produce robust spin squeezing with a many-body gap, improving upon existing protocols.

Findings

Achieves spin squeezing comparable to all-to-all interaction systems.

Demonstrates robustness against decoherence.

Shows improved performance over traditional protocols.

Abstract

We propose a new protocol for preparing spin squeezed states in controllable atomic, molecular, and optical systems, with particular relevance to emerging optical clock platforms compatible with Rydberg interactions. By combining a short-ranged, soft-core potential with an external drive, we can transform naturally emerging Ising interactions into an XX spin model while opening a many-body gap. The gap helps maintain the system within a collective manifold of states where metrologically useful spin squeezing can be generated at a level comparable to the spin squeezing generated in systems with genuine all-to-all interactions. We examine the robustness of our protocol to experimentally-relevant decoherence and show favorable performance over typical protocols lacking gap protection.