Spin squeezing in an ensemble of nitrogen–vacancy centres in diamond - Weijie Wu; Emily J. Davis; Lillian B. Hughes; Bingtian Ye; Zilin Wang; Dominik Kufel; Tasuku Ono; Simon A. Meynell; Maxwell Block; Che Liu; Haopu Yang; Ania C. Bleszynski Jayich; et al. (Nature, 2025)