Quantum simulations of ultracold chemical reactions are essential to expedite the development of technologies such as ultracold molecular qubits, but are stymied by the fact that long wavelengths associated with low energies make ultracold chemical reactions notoriously difficult to simulate. In this talk, I will discuss a new method that increases the accuracy and efficiency of ultracold chemical simulations, which is based on the finding that semiclassical Wentzel-Kramers-Brillouin corrections can be added to complex absorbing potential-based simulations to reduce anomalous reflection by orders of magnitude. In addition, I will show how Wentzel-Kramers-Brillouin force analysis and reflectionless scattering mode theory can be combined to reveal the existence of the long-sought-after quantum mechanical PT-symmetry-breaking phenomena in standard cold-atom experiments with programmable traps.

From ultracold chemistry to quantum computers: Chemistry under quantum control

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ACS Spring 2023

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