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Protecting Spin Coherence in a Tunable Heisenberg Model by Davis, Emily J.; Periwal, Avikar; Cooper, Eric S.; Bentsen, Gregory; Evered, Simon J.; Van Kirk, Katherine; Schleier-Smith, Monika H. is a scholarly article available to read on EtoBox.

What is Protecting Spin Coherence in a Tunable Heisenberg Model about?

Using an ensemble of atoms in an optical cavity, we engineer a family of nonlocal Heisenberg Hamiltonians with continuously tunable anisotropy of the spin-spin couplings. We thus gain access to a rich phase diagram, including a paramagnetic-to-ferromagnetic Ising phase transition that manifests as a diverging magnetic susceptibility at the critical point. The susceptibility displays a symmetry between Ising interactions and XY (spin-exchange) interactions of the opposite sign, which is indicative of the spatially extended atomic system behaving as a single collective spin. Images of the magnetization dynamics show that spin-exchange interactions protect the coherence of the collective spin, even against inhomogeneous fields that completely dephase the non-interacting and Ising systems. Our results underscore prospects for harnessing spin-exchange interactions to enhance the robustness of spin squeezing protocols.

Author

Davis, Emily J.; Periwal, Avikar; Cooper, Eric S.; Bentsen, Gregory; Evered, Simon J.; Van Kirk, Katherine; Schleier-Smith, Monika H.

Published

2020

Language

EN