Generation of spin-squeezed state for electronic spin in an ensemble of nitrogen-vacancy centers by cavity feedback
Phys. Rev. A 113, 013720 – Published 13 January, 2026
DOI: https://doi.org/10.1103/ljbz-zzrl
Abstract
Spin-squeezed states play an important role in quantum metrology, as they enhance the measurement precision beyond the standard quantum limit. Here we propose an approach to generating spin-squeezed states in a solid-state platform by coupling an ensemble of nitrogen-vacancy centers to an optical cavity at cryogenic temperature. Through cavity feedback, this setup enables the implementation of an all-to-all interaction (twist-and-turn), facilitating the generation of spin-squeezed states. Our results show that 7.5 dB of squeezing is achievable in the presence of imperfections including dephasing and nonuniform coupling.
