Generating stable spin squeezing by squeezed-reservoir engineering

TL;DR

This paper proposes a novel scheme to generate stable spin squeezing in many-body systems using squeezed-reservoir engineering and waveguide mediation, avoiding the need for coherent driving or spin-spin coupling, and enhancing quantum sensing capabilities.

Contribution

It introduces a new method for stable spin squeezing that scales favorably and does not require coherent driving, advancing quantum measurement techniques.

Findings

Achieves stable spin squeezing without coherent driving.

Shows improved scaling relation of spin squeezing with number of TLSs.

Demonstrates potential for enhanced quantum sensing of weak magnetic fields.

Abstract

As a genuine many-body entanglement, spin squeezing (SS) can be used to realize the highly precise measurement beyond the limit constrained by classical physics. Its generation has attracted much attention recently. It was reported that $N$ two-level systems (TLSs) located near a one-dimensional waveguide can generate a SS by using the mediation effect of the waveguide. However, a coherent driving on each TLS is used to stabilize the SS, which raises a high requirement for experiments. We here propose a scheme to generate stable SS resorting to neither the spin-spin coupling nor the coherent driving on the TLSs. Incorporating the mediation role of the common waveguide and the technique of squeezed-reservoir engineering, our scheme exhibits the advantages over previous ones in the scaling relation of the SS parameter with the number of the TLSs. The long-range correlation feature of the generated SS along the waveguide in our scheme may endow it with certain superiority in quantum sensing, e.g., improving the sensing efficiency of spatially unidentified weak magnetic fields.