A proposal for the realization of a robust quantum gate based on Rydberg atoms is analyzed, and it is shown how adiabatic dressing of the ground state protects the gate from decoherence due to random phase errors usually arising from thermal motion.

arXiv:1411.2622Physical Review AJan 28, 201579 citations

Bulletin of the American Physical Society

A Controlled-Phase Gate via Adiabatic Rydberg Dressing of Neutral Atoms

Tyler Keating, Ivan Deutsch, Robert L. Cook, Grant W. Biedermann, Yuan‐Yu Jau

Published Jun 6, 2014• 0 citations

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Adiabatic controlled-

Z

gate for neutral atoms with Förster-enhanced Rydberg dressing

We study an adiabatic controlled-

Z

(CZ) gate for neutral atoms in which dipole-dipole coupling between nearly degenerate Rydberg pair states enhances the interaction between dressed ground states. This coupling produces an avoided crossing in the two-atom dressed-state spectrum. Approaching the crossing enhances the dressed interaction, but also reduces the dressed-state gap and increases the Rydberg admixture. We identify a Förster-enhanced operating range in which the required conditional phase is accumulated with adiabatic return and small transient Rydberg population. We then analyze the finite-time dynamics of the two-qubit computational states under a smooth pulse. Reducing the dressing strength weakens the dressed interaction, so maintaining the target phase at the same pulse duration requires operation closer to the avoided crossing, where the Rydberg admixture increases. This dependence is then used to select the shortest gate at a fixed peak Rabi frequency in the Förster-enhanced operating range that accumulates the CZ phase with high Bell-state fidelity while keeping the Rydberg population small. Changing the Förster defect shifts the avoided crossing, while the gate parameters change only weakly. For a specific rubidium Förster channel, the selected gate corresponds to experimentally relevant laser coupling, pulse duration, and interatomic separation. We also estimate errors from the finite Rydberg lifetime and from weak excitation of a neighboring spectator atom. For the parameters considered, the spectator-induced error remains below the finite-lifetime contribution.