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Bulletin of the American Physical Society

An apparatus for simulating lattice spin models with Rydberg-dressed cesium atoms

Ognjen Marković, Victoria Borish, Jacob Hines, Monika Schleier-Smith

Published Jun 8, 2017• 0 citations
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We demonstrate a Rydberg-dressed ground-state blockade that provides a strong tunable interaction energy (~1 MHz in units of Planck's constant) between spins of individually trapped cesium atoms.With this interaction we directly produce Bell-state entanglement between two atoms with a fidelity ≥ 81(2)%, excluding atom loss events, and ≥ 60(3)% when loss is included [arXiv].Our method is based on a new technique that produces a blockade of Rydberg-dressed ground states.This approach allows single-step, direct entanglement of long-lived ground (clock) states in our cesium atoms.The on-demand interaction we employ-Rydberg-dressed ground states-is a long sought after fundamental capability for numerous proposals spanning from new phases of matter in ultracold quantum gases to spin-squeezed metrology in clocks and quantum computation protocols.We not only clearly measure this elusive Rydberg-dressed interaction, but also employ it to demonstrate high fidelity Bell-state generation.The entanglement generation differs from previous work in a fundamental way; the probability remains entirely in the Rydberg-dressed ground state, freeing the approach from the experimental burden of coherently exciting optical transitions to and from the Rydberg states.In principle Rydberg-dressed atoms are more insensitive to various decoherence mechanisms and lead to a better quantum control fidelity [Keating PRA].In addition, the interaction we demonstrate is nearly 4 orders of magnitude larger than that produced in the typical experiment based on ultra cold collisions.

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Spin-lattice models play a central role in the studies of quantum magnetism and nonequilibrium dynamics of spin excitations-----magnons. We show that a spin lattice with strong nearest-neighbor interactions and tunable long-range hopping of excitations can be realized by a regular array of laser-driven atoms, with an excited Rydberg state representing the spin-up state and a Rydberg-dressed ground state corresponding to the spin-down state. We find exotic interaction-bound states of magnons that propagate in the lattice via the combination of resonant two-site hopping and nonresonant second-order hopping processes. Arrays of trapped Rydberg-dressed atoms can thus serve as a flexible platform to simulate and study fundamental few-body dynamics in spin lattices.

arXiv:1712.04713•Physical Review A•Apr 16, 2018•20 citations
We demonstrate a Rydberg-dressed ground-state blockade that provides a strong tunable interaction energy (~1 MHz in units of Planck's constant) between spins of individually trapped cesium atoms.With this interaction we directly produce Bell-state entanglement between two atoms with a fidelity ≥ 81(2)%, excluding atom loss events, and ≥ 60(3)% when loss is included [arXiv].Our method is based on a new technique that produces a blockade of Rydberg-dressed ground states.This approach allows single-step, direct entanglement of long-lived ground (clock) states in our cesium atoms.The on-demand interaction we employ-Rydberg-dressed ground states-is a long sought after fundamental capability for numerous proposals spanning from new phases of matter in ultracold quantum gases to spin-squeezed metrology in clocks and quantum computation protocols.We not only clearly measure this elusive Rydberg-dressed interaction, but also employ it to demonstrate high fidelity Bell-state generation.The entanglement generation differs from previous work in a fundamental way; the probability remains entirely in the Rydberg-dressed ground state, freeing the approach from the experimental burden of coherently exciting optical transitions to and from the Rydberg states.In principle Rydberg-dressed atoms are more insensitive to various decoherence mechanisms and lead to a better quantum control fidelity [Keating PRA].In addition, the interaction we demonstrate is nearly 4 orders of magnitude larger than that produced in the typical experiment based on ultra cold collisions.
Spin-lattice models play a central role in the studies of quantum magnetism and nonequilibrium dynamics of spin excitations-----magnons. We show that a spin lattice with strong nearest-neighbor interactions and tunable long-range hopping of excitations can be realized by a regular array of laser-driven atoms, with an excited Rydberg state representing the spin-up state and a Rydberg-dressed ground state corresponding to the spin-down state. We find exotic interaction-bound states of magnons that propagate in the lattice via the combination of resonant two-site hopping and nonresonant second-order hopping processes. Arrays of trapped Rydberg-dressed atoms can thus serve as a flexible platform to simulate and study fundamental few-body dynamics in spin lattices.