Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
Q 49.2: Vortrag
Donnerstag, 14. März 2024, 14:45–15:00, HS 1098
Coherent excitation of a Sub-mHz optical magnetic quadrupole transition — •Valentin Klüsener1,2, Sebstian Pucher1,2, Dimitry Yankelev1,2, Felix Spriestersbach1,2, Jan Trautmann1,2, Immanuel Bloch1,2,3, and Sebastian Blatt1,2,3 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology, 80799 München, Germany — 3Fakultät für Physik, Ludwig-Maximilians-Universität München, 80799 München, Germany
Ultranarrow clock transitions to metastable states are fundamental for many applications in quantum metrology, simulation and information. We report on the first coherent excitation of the 1S0-3P2 magnetic quadrupole (M2) transition in 88Sr. By confining atoms in a state insensitive three-dimensional optical lattice, we achieve excitation fractions of 97 % and observe Fourier limited linewidths as narrow as 55 Hz. We characterize the coherence of the prepared states by performing Ramsey spectroscopy and find coherence times of 10 ms, which can be extended to 250 ms with a spin-echo sequence. Finally, we use our spectroscopic results to determine the decay rate of the M2 transition to 154(32) × 10−6 s−1 in agreement with longstanding theoretical predictions. These results establish an additional clock transition in neutral strontium and pave the way for applications of the metastable 3P2 state in precision quantum metrology, simulation and information processing.
Keywords: Spectroscopy; Quantum simulation; Metrology; Quantum computing; Optical lattice