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

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.

4 pages, 4 figures

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• Quantum Metrology via Floquet-Engineered Two-axis Twisting and Turn Dynamics
• Short-time expansion of Heisenberg operators in open collective quantum spin systems
• Enhanced Quantum Metrology via Saddle-Point Scrambling in Phase Space
• Protecting spin squeezing from decoherence
• Phonon-induced two-axis spin squeezing with decoherence reduction in hybrid spin-optomechanical system
• Quantum states preparation of an atomic ensemble via cavity-assisted homodyne measurement