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 and Christopher Monroe ()
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Sagnik Saha: Duke University
Mikhail Shalaev: Duke University
Jameson O’Reilly: Duke University
Isabella Goetting: Duke University
George Toh: Duke University
Ashish Kalakuntla: Duke University
Yichao Yu: Duke University
Christopher Monroe: Duke University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: 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 fundamental limits due to atomic recoil still allow fidelities in excess of 99.9%.

Date: 2025
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DOI: 10.1038/s41467-025-57557-4

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