ECAMP 15

The rotation of trapped molecules, with state spaces of larger angular momentum and their relatively large electric dipole moments, could offer a promising platform for quantum technologies and quantum information processing (QIP). To explore the experimental utility of molecules for various quantum applications, we are developing state preparation and coherent control protocols based on quantum logic spectroscopy. This technique maps quantum information from molecular to atomic ions for robust state detection. Beyond state preparation and single molecule control, a key requirement for QIP is the generation of quantum entanglement. We are developing strategies for entangling two molecular ions in their angular momenta.

As these QIP operations are implemented on molecules, environment-induced noise can corrupt the quantum state. Quantum error correction codes that protect quantum information encoded in rotational states of a single molecule have recently been developed [1]. We present a step towards experimental implementation of one family of such codes, namely absorption-emission codes. We construct check and correction operators and then describe and analyze a measurement-based sequential as well as an autonomous implementation strategy in the presence of thermal background radiation, a major noise source for rotation in polar molecules. The presented strategies and methods might enable robust sensing or even fault-tolerant quantum computing using the rotation of individual molecules [2].

[1] S.P. Jain et al. Phys. Rev. Lett. \textbf{133}, 260601 (2024)
[2] B.J. Furey et al. Quantum \textbf{8}, 1578 (2024)