Dissipative Preparation of Spin Squeezed Atomic Ensembles in a Steady State

TL;DR

This paper introduces a dissipative method to generate spin squeezed states in atomic ensembles by leveraging collective coupling to an optical cavity, enabling deterministic preparation of states near the Heisenberg limit.

Contribution

It presents a novel dissipative approach for preparing spin squeezed states via collective atomic dark states in an open cavity, turning dissipation into a resource for entanglement.

Findings

Dark states can be explicitly constructed and are decoupled from radiation.

Spin squeezing can reach the Heisenberg limit with this method.

The approach is robust to realistic imperfections.

Abstract

We present and analyze a new approach for the generation of atomic spin squeezed states. Our method involves the collective coupling of an atomic ensemble to a decaying mode of an open optical cavity. We demonstrate the existence of a collective atomic dark-state, decoupled from the radiation field. By explicitly constructing this state we find that it can feature spin squeezing bounded only by the Heisenberg limit. We show that such dark states can be deterministically prepared via dissipative means, thus turning dissipation into a resource for entanglement. The scaling of the phase sensitivity taking realistic imperfections into account is discussed.