Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session X03: Atomic and Molecular Structure and Spectroscopy II
8:00 AM,
Friday, June 7, 2024
Room: 201A
Chair: Spencer Walker, Department of Physics, The Ohio State University
Abstract: X03.00001 : Coherent Control of Strontium in an Optical Lattice: Spectroscopy of a M2 Transition and Demonstration of a Fine-Structure Qubit*
8:00 AM–8:12 AM
Presenter:
Valentin Kluesener
(Max Planck Institute of Quantum Optics)
Authors:
Valentin Kluesener
(Max Planck Institute of Quantum Optics)
Sebastian Pucher
(Max Planck Institute of Quantum Optics)
Felix Spriestersbach
(Max Planck Institute of Quantum Optics)
Jan Geiger
(Max Planck Institute of Quantum Optics)
Andreas Schindewolf
(Max Planck Institute for Quantum Optics)
Immanuel Bloch
(Max Planck Institute for Quantum Optics)
Sebastian Blatt
(Max Planck Institute of Quantum Optics)
Here, we present our results on the coherent excitation of the ultranarrow 1S0–3P2 magnetic quadrupole (M2) transition in 88Sr. By confining atoms in a state-insensitive optical lattice, we achieve excitation fractions of 97(1) % and observe linewidths as narrow as 58(1) Hz. With Ramsey spectroscopy, we find coherence times of 14(1) ms, which can be extended to 266(36) ms using a spin-echo sequence. We perform a precision measurement of the transition matrix element and find a linewidth of the M2 transition of 24(7) μHz, confirming longstanding theoretical predictions and establishing an additional clock transition in strontium.
Building on these results, we demonstrate coherent control of the strontium fine-structure qubit, which promises fast single- and two-qubit gates. This THz qubit is encoded in the metastable 3P2 and 3P0 states, which are coupled by a Raman transition. We use the 1S0–3P2 M2 transition for coherent state-initialization and read-out. We demonstrate Rabi oscillations with more than 60 coherent cycles and single-qubit rotations on the μs scale. Our results pave the way for fast quantum information processors and highly tunable quantum simulators with two-electron atoms.
*We acknowledge funding by the Munich Quantum Valley initiative as part of the High-Tech Agenda Plus of the Bavarian State Government, by the BMBF through the program "Quantum technologies – from basic research to market" (Grant No. 13N16357), and funding under the Horizon Europe program HORIZON-CL4-2022-QUANTUM-02-SGA via the project 101113690 (PASQuanS2.1). V. K. thanks the Hector Fellow Academy for support.
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