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

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.

10 pages, 8 figures

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• Uniting Quantum Processing Nodes of Cavity-coupled Ions with Rare-earth Quantum Repeaters Using Single-photon Pulse Shaping Based on Atomic Frequency Comb
• Deterministic generation of frequency-bin-encoded microwave photons
• Mitigation of birefringence in cavity-based quantum networks using frequency-encoded photons
• Fidelity-Aware Multipath Routing for Multipartite State Distribution in Quantum Networks
• Quantum low-density parity-check codes for erasure-biased atomic quantum processors
• Space-time tradeoff in networked virtual distillation
• Kilometer-Scale Ion-Photon Entanglement with a Metastable ${}^{88}$Sr${}^{+}$ Qubit
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• High-rate qutrit entanglement swapping with photon-number-basis
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• Multiplexed ion-ion entanglement over $1.2$ kilometer fibers