Efficient ground-state cooling of large trapped-ion chains with an EIT tripod scheme

Abstract

We report the electromagnetically-induced-transparency (EIT) cooling of a large trapped ${}^{171}$Yb${}^{+}$ ion chain to the quantum ground state. Unlike conventional EIT cooling, we engage a four-level tripod structure and achieve fast sub-Doppler cooling over all motional modes. We observe simultaneous ground-state cooling across the complete transverse mode spectrum of up to $40$ ions, occupying a bandwidth of over $3$ MHz. The cooling time is observed to be less than $300\mu$s, independent of the number of ions. Such efficient cooling across the entire spectrum is essential for high-fidelity quantum operations using trapped ion crystals for quantum simulators or quantum computers.

arXiv commentMain text: 4 pages, 4 figures; Supplement: 4 pages, 5 figures

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• Scalable quantum logic spectroscopy
• Chiral-coupling-assisted refrigeration in trapped ions
• Fractal ground state of ion chains in periodic potentials
• Non-invasive measurement of currents in analog quantum simulators
• Fano Resonance in Excitation Spectroscopy and Cooling of an Optically Trapped Single Atom
• Sub-Doppler cooling of a trapped ion in a phase-stable polarization gradient
• Optimized readout strategies for neutral atom quantum processors
• High-speed and high-connectivity two-qubit gates in long chains of trapped ions
• Optimizing measurement-based cooling by reinforcement learning
• Pulse optimization for high-precision motional-mode characterization in trapped-ion quantum computers
• Non-equilibrium critical scaling and universality in a quantum simulator
• Ion counting and temperature determination of Coulomb-crystallized laser-cooled ions in traps using convolutional neural networks
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• Optical lattice with spin-dependent sub-wavelength barriers
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• An open-endcap blade trap for radial-2D ion crystals