Demonstration of two-atom entanglement with ultrafast optical pulses

Abstract

We demonstrate quantum entanglement of two trapped atomic ion qubits using a sequence of ultrafast laser pulses. Unlike previous demonstrations of entanglement mediated by the Coulomb interaction, this scheme does not require confinement to the Lamb-Dicke regime and can be less sensitive to ambient noise due to its speed. To elucidate the physics of an ultrafast phase gate, we generate a high entanglement rate using just 10 pulses, each of $\sim 20$ ps duration, and demonstrate an entangled Bell-state with $(76\pm 1)$% fidelity. These results pave the way for entanglement operations within a large collection of qubits by exciting only local modes of motion.

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• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Fast and robust two-qubit gates for scalable ion trap quantum computing
• Ultrafast Gates for Single Atomic Qubits
• Fast gates for ion traps by splitting laser pulses

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