SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum Technologies: Trapped Ions (joint session Q/QI)
Q 28.1: Talk
Wednesday, March 8, 2023, 11:00–11:15, F342
Non-commuting dynamics in light-ion-interactions on an ion-trap system — •Sebastian Saner1, Oana Bazavan1, Donovan Webb1, Gabriel Araneda1, Mariella Minder1, David Lucas1, Raghavendra Srinivas1, and Chris Ballance1,2 — 1University of Oxford, Oxford, UK — 2Oxford Ionics, Oxford, UK
The interaction Hamiltonian that governs the dynamics between trapped ions and laser light [1] is well studied and understood in the limit of low laser powers, leading to simple dynamics. However, at high powers, off-resonant coupling to multiple carrier and motional transitions is not negligible, leading to more complex and richer dynamics, with Hamiltonians exhibiting non-commuting terms.
In quantum computing with trapped ions, fast and versatile interactions that require high laser powers are important. It is of interest to either suppress those off-resonant terms or harness them in a controlled way. In this talk, we present our experimental work on utilising non-commuting terms to create two-qubit entanglement [2]. Furthermore, we evaluate how to apply this idea in the context of hybrid spin-motion systems. Secondly, we will show how we employ a phase stable optical lattice to coherently suppress a non-commuting error source that appears in the conventional Molmer-Sorensen interaction. This approach has the potential to allow for fast and high-fidelity entangling gates which are not limited by scattering errors.
[1]: Wineland et al., J. Res. Natl. Inst. Stand. Technol. 103(3), 259-328, 1998
[2]: Bazavan, Saner et al., arXiv:2207.11193, 2022