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Multiqubit parity gates for Rydberg atoms in various configurations

Javad Kazemi1,*, Michael Schuler2, Christian Ertler1, and Wolfgang Lechner1,2,3,4

  • 1Parity Quantum Computing Germany GmbH, Schauenburgerstraße 6, 20095 Hamburg, Germany
  • 2Parity Quantum Computing GmbH, Rennweg 1, Top 314, 6020 Innsbruck, Austria
  • 3Parity Quantum Computing France SAS, 10 Avenue de Kléber, 75016 Paris, France
  • 4Institute for Theoretical Physics, University of Innsbruck, 6020 Innsbruck, Austria

  • *Contact author: j.kazemi@parityqc.com
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Phys. Rev. Research 7, 033269 – Published 22 September, 2025

DOI: https://doi.org/10.1103/56qk-rmsz

Abstract

We present a native approach for realizing multiqubit parity phase gates in neutral-atom systems through global phase modulation of a Rydberg excitation laser. By shaping the temporal profile of the laser’s phase, we enable high-fidelity, time efficient entangling operations between multiple qubits without requiring individual qubit addressing. To mitigate intrinsic noise sources including spontaneous decay and motional effects, we develop a noise-aware optimal control framework that reduces gate errors under the presence of noise while maintaining smooth pulse profiles suitable for experimental implementation. In addition to equidistant qubit arrangements, we explore the impact of nonequidistant atomic configurations, where interaction inhomogeneity becomes significant. In these cases, the flexibility of our control approach helps to compensate for such variations, supporting reliable gate performance across different spatial layouts. These results facilitate the practical implementation of complex, multiqubit quantum operations in near-term neutral-atom quantum processors.

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Phys. Rev. Research 7, 033269– Published 22 September, 2025
  • Received 13 June 2025
  • Accepted 20 August 2025
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