Ultracold polar molecules as qudits
Abstract
We discuss how the internal structure of ultracold molecules, trapped in the motional ground state of optical tweezers, can be used to implement qudits. We explore the rotational, fine and hyperfine structure of CaF and RbCs, which are examples of molecules with and electronic ground states, respectively. In each case we identify a subset of levels within a single rotational manifold suitable to implement a 4-level qudit. Quantum gates can be implemented using two-photon microwave transitions via levels in a neighboring rotational manifold. We discuss limitations to the usefulness of molecular qudits, arising from off-resonant excitation and decoherence. As an example, we present a protocol for using a molecular qudit of dimension to perform the Deutsch algorithm.
Cite
@article{arxiv.1909.07484,
title = {Ultracold polar molecules as qudits},
author = {Rahul Sawant and Jacob A Blackmore and Philip D Gregory and Jordi Mur-Petit and Dieter Jaksch and Jesús Aldegunde and Jeremy M Hutson and M R Tarbutt and Simon L Cornish},
journal= {arXiv preprint arXiv:1909.07484},
year = {2019}
}