Two-axis spin squeezing of two-component BEC via a continuous driving

TL;DR

This paper proposes a continuous driving scheme to transform the one-axis twisting Hamiltonian in two-component BECs into a two-axis twisting Hamiltonian, significantly enhancing spin squeezing towards the Heisenberg limit, with promising experimental applications.

Contribution

It introduces a continuous driving method to achieve two-axis spin squeezing in BECs, surpassing previous limitations of one-axis twisting.

Findings

Enhanced spin squeezing scales as N^{-1}

Scheme approaches the Heisenberg limit

Suitable for experimental implementation

Abstract

In two-component BEC, the one-axis twisting Hamiltonian leads to spin squeezing with the limitation that scales with the number of atoms as $N^{-\frac{2}{3}}$. We propose a scheme to transform the one-axis twisting Hamiltonian into a two-axis twisting Hamiltonian, resulting in enhanced spin squeezing $\propto N^{-1}$ approaching the Heisenberg limit. Instead of pulse sequences, only one continuous driving field is required to realizing such transforming, thus the scheme is promising for experiment realizations, to an one-axis twisting Hamiltonian. Quantum information processing and quantum metrology may benefit from this method in the future.