Southwest Quantum Information and Technology

Generation of high-fidelity Molmer-Sorenson interactions between neutral atoms using adiabatic Rydberg dressing

Presenting Author: Anupam Mitra, University of New Mexico CQuIC
Contributing Author(s): Michael J. Martin, Grant W. Biedermann, Alberto M. Marino, Pablo M. Poggi, Ivan H. Deutsch

Arrays of optically trapped neutral atoms interacting through the Rydberg dipole blockade mechanics is a promising platform for scalable quantum information processors including universal quantum computers, analog quantum simulators, and quantum sensors. Critical to the performance of these devices is high-fidelity two-qubit interactions. We show that by strongly dressing ground states with Rydberg states in the presence of the blockade we can implement high fidelity entangling interactions on clock-state qubits. This gate can be made robust to imperfections such as atomic thermal motion, laser inhomogeneities, and an imperfect Rydberg blockade. In particular, we show that the error in implementing a two-qubit entangling gate is dominated by errors in the single atom light shift, and this can be easily mitigated using adiabatic dressing, interleaved with a spin echo. This implements a two-qubit Mølmer-Sørenson gate. Current modest experimental parameters allow a gate fidelity of >99.5%, and a path to higher gate fidelities is achievable with stronger Rydberg blockade, longer Rydberg state lifetimes and larger Rabi frequencies. We also study the application of the Mølmer-Sørenson interaction to many-body systems with multiple qubits.

Read this article online: https://arxiv.org/abs/1911.04045

(Session 10 : Monday from 9:45am - 10:15am)