Fine-Structure Qubit Encoded in Metastable Strontium Trapped in an Optical Lattice

• Main Authors: Pucher, S, Klüsener, V, Spriestersbach, F, Geiger, J, Schindewolf, A, Bloch, I, Blatt, S
• Format: Journal Article
• Language: English
• Published: 25-01-2024
• Subjects: Physics - Atomic Physics; Physics - Quantum Gases; Physics - Quantum Physics
• DOI: 10.48550/arxiv.2401.11054

Physical Review Letters 132, 150605 (2024) We demonstrate coherent control of the fine-structure qubit in neutral
strontium atoms. This qubit is encoded in the metastable $^3\mathrm{P}_2$ and
$^3\mathrm{P}_0$ states, coupled by a Raman transition. Using a magnetic
quadrupole transition, we demonstrate coherent state-initialization of this THz
qubit. We show Rabi oscillations with more than 60 coherent cycles and
single-qubit rotations on the $\mu$s scale. With spin-echo, we demonstrate
coherence times of tens of ms. Our results pave the way for fast quantum
information processors and highly tunable quantum simulators with two-electron
atoms.