Nature Physics, Published online: 05 May 2026; doi:10.1038/s41567-026-03224-4
A method applied to a single trapped ion combines two linear spin-dependent interactions to generate nonlinear couplings in the ion’s motion: squeezing, trisqueezing and quadsqueezing interactions are demonstrated. The approach can be applied to any spin–oscillator system, produces stronger unitary interactions with the flexibility to switch quickly between orders, and scales seamlessly to higher orders and multiple oscillators.
