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  • Letter
  • Open Access

Robust coherent control of two-body collisions beyond the ultracold regime

Adrien Devolder1, Paul Brumer1, and Timur V. Tscherbul2

  • 1Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, Canada M5S 3H6
  • 2Department of Physics, University of Nevada, Reno, Nevada 89557, USA

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Phys. Rev. Research 5, L042025 – Published 14 November, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L042025

Abstract

Quantum coherent control of collisions beyond the ultracold regime can face a major challenge due to the incoherent addition of different partial-wave contributions to the total scattering cross section. These contributions become increasingly numerous as the collision energy increases, leading to a loss of overall control. Here, we overcome this limitation by leveraging the recently discovered partial-wave phase locking (PWPL) effect, which synchronizes the oscillations of all partial-wave contributions. By using rigorous quantum scattering calculations, we demonstrate that PWPL enables coherent control of spin exchange in ion-atom collisions, far outside the ultracold regime. The predicted extent of control is sufficient to be measurable in cold atom-ion hybrid experiments.

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Phys. Rev. Research 5, L042025– Published 14 November, 2023
  • Received 23 June 2023
  • Accepted 14 September 2023
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