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

Abstract

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.

arXiv comment5 pages, 4 figures, 4 pages supplemental material

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• Optimized measurement-free and fault-tolerant quantum error correction for neutral atoms
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• Bosonic Quantum Error Correction with Neutral Atoms in Optical Dipole Traps
• Fast entangling gates for Rydberg atoms via resonant dipole-dipole interaction
• High-fidelity and robust controlled-Z gates implemented with Rydberg atoms via echoing rapid adiabatic passage
• Coherent control over the high-dimensional space of the nuclear spin of alkaline-earth atoms
• Realization of a fast triple-magic all-optical qutrit in strontium-88
• Efficient generation of multiqubit entanglement states using rapid adiabatic passage
• Coherent Three-Photon Excitation of the Strontium Clock Transition
• Universal gates for a metastable qubit in strontium-88
• Barium-based Rydberg atom quantum technologies with long Rydberg coherence
• Parallel assembly of neutral atom arrays with an SLM using linear phase interpolation
• Collinear Three-Photon Excitation of a Strongly Forbidden Optical Clock Transition
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• Broadband femtosecond lasers enable efficient two-photon excitation of the ultranarrow linewidth singlet 1s2s state in helium
• Sub-Doppler cooling, state preparation, and optical trapping of a triel atom