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

TL;DR

This paper demonstrates high-fidelity entanglement between remote trapped atomic qubits using time-bin photon encoding, advancing quantum communication and scalable quantum networks.

Contribution

It introduces a novel method for entangling remote atomic qubits via time-bin photons, achieving high fidelity and error suppression.

Findings

Achieved 97% entanglement fidelity between remote atoms.

Time-bin encoding reduces polarization sensitivity and error.

Fidelity beyond 99.9% is feasible with improved techniques.

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.