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Neutral-atom entanglement using adiabatic Rydberg dressing

Anupam Mitra1,2,*, Sivaprasad Omanakuttan1,2,†, Michael J. Martin3,1,‡, Grant W. Biedermann4,§, and Ivan H. Deutsch1,2,∥

  • 1Center for Quantum Information and Control, University of New Mexico, Albuquerque, New Mexico 87131, USA
  • 2Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87106, USA
  • 3Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 4Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA

  • *anupam@unm.edu
  • †somanakuttan@unm.edu
  • ‡mmartin@lanl.gov
  • §biedermann@ou.edu
  • ∥ideutsch@unm.edu
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Phys. Rev. A 107, 062609 – Published 15 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.062609

Abstract

We revisit the implementation of a two-qubit entangling gate, the Mølmer-Sørensen gate, using the adiabatic Rydberg dressing paradigm for neutral atoms as studied in [A. Mitra et al., Phys. Rev. A 101, 030301(R) (2020)]. We study the implementation of rapid adiabatic passage using a two-photon transition, which does not require the use of an ultraviolet laser, and can be implemented using only amplitude modulation of one field with all laser frequencies fixed. We find that entangling gate fidelities, comparable to the one-photon excitation, are achievable with the two-photon excitation. Moreover, we address how the adiabatic dressing protocol can be used to implement entangling gates outside the regime of a perfect Rydberg blockade. We show that, by using adiabatic dressing, we can achieve scaling of the gate fidelity set by the fundamental limits to entanglement generated by the Rydberg interactions while simultaneously retaining a limited population in the doubly excited Rydberg state. This allows for fast high-fidelity gates for atoms separated beyond the blockade radius.

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Phys. Rev. A 107, 062609– Published 15 June, 2023
  • Received 1 September 2022
  • Accepted 16 February 2023
Article part of CHORUS
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