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Parametrized multiqubit gates for neutral-atom quantum platforms

Madhav Mohan1,*, Julius de Hond2, and Servaas Kokkelmans1

  • *Contact author: m.mohan@tue.nl
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Phys. Rev. Applied 23, 054074 – Published 27 May, 2025

DOI: https://doi.org/10.1103/PhysRevApplied.23.054074

Abstract

A clever choice and design of gate sets can reduce the depth of a quantum circuit, and can improve the quality of the solution one obtains from a quantum algorithm. This is especially important for near-term quantum computers that suffer from various sources of error that propagate with the circuit depth. Parametrized gates in particular have found use in both near-term algorithms and circuit compilation. The one- and two-qubit versions of these gates have been demonstrated on various computing architectures. The neutral-atom platform has the capability to implement native N-qubit gates (for N≥2). However, one needs to first find the control functions that implement these gates on the hardware. We study the numerical optimization of neural networks towards obtaining families of controls—laser pulses to excite an atom to Rydberg states—that implement phase gates with one and two controls, the C1P and C2P gates, respectively, on neutral-atom hardware. The pulses we obtain have a duration significantly shorter than the loss time scale, set by decay from the Rydberg state. In addition, they do not require single-site addressability and are smooth. Hence, we expect our gates to have immediate benefits for quantum algorithms implemented on current neutral-atom hardware.

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Phys. Rev. Applied 23, 054074– Published 27 May, 2025
  • Received 2 December 2024
  • Revised 17 March 2025
  • Accepted 5 May 2025
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