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arXiv · 2406.01761

High-fidelity remote entanglement of trapped atoms mediated by time-bin photons

Sagnik Saha·Mikhail Shalaev·Jameson O'Reilly·Isabella Goetting·George Toh·Ashish Kalakuntla·Yichao Yu·Christopher Monroe
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Abstract

Photonic interconnects between quantum processing nodes are likely the only way to achieve large-scale quantum computers and networks. The bottleneck in such an architecture is the interface between well-isolated quantum memories and flying photons. We establish high-fidelity entanglement between remotely separated trapped atomic qubit memories, mediated by photonic qubits stored in the timing of their pulses. Such time-bin encoding removes sensitivity to polarization errors, enables long-distance quantum communication, and is extensible to quantum memories with more than two states. Using a measurement-based error detection process and suppressing a fundamental source of error due to atomic recoil, we achieve an entanglement fidelity of 97% and show that fidelities beyond 99.9% are feasible.

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Sagnik Saha, Mikhail Shalaev, Jameson O'Reilly, Isabella Goetting, George Toh, Ashish Kalakuntla, Yichao Yu, Christopher Monroe. 2024-06-03. High-fidelity remote entanglement of trapped atoms mediated by time-bin photons. https://doi.org/10.1038/s41467-025-57557-4

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