Journal
NATURE PHYSICS
Volume 16, Issue 8, Pages 857-+Publisher
NATURE RESEARCH
DOI: 10.1038/s41567-020-0903-z
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Funding
- Institute for Quantum Information and Matter, an NSF Physics Frontiers Center grant [PHY-1733907]
- NSF CAREER award [1753386]
- AFOSR YIP [FA9550-19-1-0044]
- Sloan Foundation
- President's and Director's Research and Development Fund (PDRDF)
- PMA Prize postdoctoral fellowship
- IQIM postdoctoral fellowship
- Gordon and Betty Moore Foundation
- Larson SURF fellowship
- Caltech Student-Faculty Programs
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High entanglement fidelity between neutral atoms is achieved using highly excited Rydberg states. The unique electron structure provided by alkaline-earth atoms makes it a promising platform for various quantum-technology-based applications. Trapped neutral atoms have become a prominent platform for quantum science, where entanglement fidelity records have been set using highly excited Rydberg states. However, controlled two-qubit entanglement generation has so far been limited to alkali species, leaving the exploitation of more complex electronic structures as an open frontier that could lead to improved fidelities and fundamentally different applications such as quantum-enhanced optical clocks. Here, we demonstrate a novel approach utilizing the two-valence electron structure of individual alkaline-earth Rydberg atoms. We find fidelities for Rydberg state detection, single-atom Rabi operations and two-atom entanglement that surpass previously published values. Our results pave the way for novel applications, including programmable quantum metrology and hybrid atom-ion systems, and set the stage for alkaline-earth based quantum computing architectures.
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