Protecting Spin Coherence in a Tunable Heisenberg Model
- URL: http://arxiv.org/abs/2003.06087v2
- Date: Sun, 30 Aug 2020 22:00:46 GMT
- Title: Protecting Spin Coherence in a Tunable Heisenberg Model
- Authors: Emily J. Davis, Avikar Periwal, Eric S. Cooper, Gregory Bentsen, Simon
J. Evered, Katherine Van Kirk, Monika H. Schleier-Smith
- Abstract summary: We study a family of nonlocal Heisenberg Hamiltonians with tunable anisotropy of the spin-spin couplings.
Images of the magnetization dynamics show that spin-exchange interactions protect the coherence of the collective spin.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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.
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