Generation of spin squeezing via a fully quantum degenerate parametric amplifier

TL;DR

This paper proposes a new protocol using a fully quantum degenerate parametric amplifier to generate significant spin squeezing in atomic ensembles, potentially enhancing high-precision measurements.

Contribution

It introduces a novel quantum protocol for spin squeezing that is experimentally feasible and comparable to existing models like the two-axis twisting (TAT) model.

Findings

Generated spin squeezing strength is sizable and comparable to TAT model.

The protocol is feasible with realistic experimental parameters.

Spin squeezing can be achieved with or without pump cavity driving.

Abstract

Spin squeezing is one of the most attractive methods for realizing high-precision metrology. In this paper, we propose a protocol for generating spin squeezing in an atomic ensemble via a fully quantum degenerate parametric amplifier. We discuss the properties of generating spin squeezing with and without driving the pump cavity. Numerical simulation results show that the generated spin squeezing strength is sizable, and is able to be comparable to that obtained using a two-axis twisting (TAT) model. Moreover, we demonstrate that the protocol is experimentally feasible by introducing the corresponding experimental parameters. Therefore, the proposed protocol provides a promising approach to realize spin squeezing in photon-spin coupling systems.