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Q: Fachverband Quantenoptik und Photonik
Q 29: Implementations: Ions and Atoms (joint session QI/Q)
Q 29.6: Vortrag
Mittwoch, 8. März 2023, 12:30–12:45, F428
Coherent transfer of transverse optical momentum to the motion of a single trapped ion — •Felix Stopp1, Maurizio Verde1, Milton Katz2, Martín Drechsler2, Christian Schmiegelow2, and Ferdinand Schmidt-Kaler1 — 1QUANTUM, Institut für Physik, Universität Mainz, Mainz, Germany — 2CONICET, Instituto de Física de Buenos Aires (IFIBA), Universidad de Buenos Aires, Buenos Aires, Argentina
A structured light beam is carrying orbital angular momentum and we demonstrate the excitation of the center of mass motion of a single atom in the transverse direction to the beam’s propagation. This interaction is achieved with a vortex beam carrying one unit of orbital angular momentum and one unit of spin angular momentum. Using a singly charged 40Ca+ ion, cooled near the ground state of motion in the three-dimensional harmonic potential of a Paul trap, we probe the sidebands of the S1/2 to D5/2 transition near 729 nm to quantify the momentum transfer. Exchange of quanta in the perpendicular direction to the beam’s wave vector k is observed in case of centered a vortex shaped beam, while parasitic carrier excitation is reduced by a factor 40. This is in sharp contrast to the vanishing spin-motion coupling at the center of Gaussian beam. We characterize the coherent interaction by an effective transverse Lamb-Dicke factor η⊥exp=0.0062(5) which is in agreement with our theoretical prediction η⊥theo=0.0057(1) [1]. Finally we discuss the application of our finding for quantum information processing with trapped ion crystals.
[1] accepted Paper 22 November 2022: Phys. Rev. Lett.