Coherent Control of the Fine-Structure Qubit in a Single Alkaline-Earth Atom

Abstract

We report on the first realization of a novel neutral atom qubit encoded in the metastable fine-structure states ${}^3{\mathrm{P}}_0$ and ${}^3{\mathrm{P}}_2$ of single ${}^{88}$Sr atoms trapped in an optical tweezer. Raman coupling of the qubit states promises rapid single-qubit rotations on par with the fast Rydberg-mediated two-body gates. We demonstrate preparation, read-out, and coherent control of the qubit. In addition to driving Rabi oscillations bridging an energy gap of more than 17 THz using a pair of phase-locked clock lasers, we also carry out Ramsey spectroscopy to extract the transverse qubit coherence time $T_2$. When the tweezer is tuned into magic trapping conditions, which is achieved in our setup by tuning the tensor polarizability of the ${}^3{\mathrm{P}}_2$ state via an external control magnetic field, we measure $T_2=1.2$ ms. A microscopic quantum mechanical model is used to simulate our experiments including dominant noise sources. We identify the main constraints limiting the observed coherence time and project improvements to our system in the immediate future. Our work opens the door for a so far unexplored qubit encoding concept for neutral atom based quantum computing.

6 pages, 5 figures

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Cited by in corpus (23)

• Continuous operation of large-scale atom arrays in optical lattices
• Fine-Structure Qubit Encoded in Metastable Strontium Trapped in an Optical Lattice
• Computational Capabilities and Compiler Development for Neutral Atom Quantum Processors: Connecting Tool Developers and Hardware Experts
• Optimized measurement-free and fault-tolerant quantum error correction for neutral atoms
• Coherent excitation of a $\mu$Hz scale optical magnetic quadrupole transition
• Optimal control transport of neutral atoms in optical tweezers at finite temperature
• A hybrid atom tweezer array of nuclear spin and optical clock qubits
• Bosonic Quantum Error Correction with Neutral Atoms in Optical Dipole Traps
• Fast entangling gates for Rydberg atoms via resonant dipole-dipole interaction
• Efficient preparation of Dicke states
• High-fidelity and robust controlled-Z gates implemented with Rydberg atoms via echoing rapid adiabatic passage
• Realization of a fast triple-magic all-optical qutrit in strontium-88
• Engineering Rydberg-pair interactions in divalent atoms with hyperfine-split ionization thresholds
• Coherent Three-Photon Excitation of the Strontium Clock Transition
• Efficient generation of multiqubit entanglement states using rapid adiabatic passage
• Multi-Qubit Parity Gates for Rydberg Atoms in Various Configurations
• Universal gates for a metastable qubit in strontium-88
• Barium-based Rydberg atom quantum technologies with long Rydberg coherence
• Determining the ${}^3$P${}_0$ excited-state tune-out wavelength of ${}^{174}$Yb in a triple-magic lattice
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• Measurement-free quantum error correction optimized for biased noise
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• Sub-Doppler cooling, state preparation, and optical trapping of a triel atom