Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.48: Poster
Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer
Correlations in two-photon-excited ion chains — •Zyad Shehata1,3, Stefan Richter1,2, Benjamin Zenz4, Maurizio Verde4, Ansgar Schaefer4, Ferdinand Schmidt-Kaler4, and Joachim von Zanthier1,3 — 1AG Quantum Optics and Quantum Information, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 1, 91058 Erlangen, Germany — 2Photonscore GmbH, 39118 Magdeburg, Germany — 3Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Paul-Gordan-Straße 6, 91052 Erlangen, Germany — 4QUANTUM, Institut für Physik, Johannes Gutenberg Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany
In this work, small crystals of trapped Ca-ions are studied using background-free coherent scattering and two-photon excitation via the D5/2 metastable state. The narrow quadrupole transitions allows for spin selective excitation and thus for far field imaging of the spin state of the crystals using G(1) function. The visibility of the interference pattern depends on the power and the detuning of the two lasers at 729 nm and 854 nm employed in the two-photon excitation as well as on the strength and orientation of the magnetic field that splits the ground state spin states. To calculate G(1), a full interaction Hamiltonian of the system including the two laser beams and all transitions involved is solved numerically for any number of ions, and experimental spatial frequencies of ion crystals are reconstructed for low exposure times (250 ms - up to 1 s) and detected by an ultra-fast picosecond-time-resolution camera.
Keywords: Ion trapping; Photon correlations; Spin-dependent scattering; coherent scattering; Ultrafast detection