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- W4386080607 abstract "Long-distance entanglement distribution is the key task for quantum networks, enabling applications such as secure communication and distributed quantum computing. Here we report on novel developments extending the reach for sharing entanglement between a single $^{87}$Rb atom and a single photon over long optical fibers. To maintain a high fidelity during the long flight times through such fibers, the coherence time of the single atom is prolonged to 7 ms by applying a long-lived qubit encoding. In addition, the attenuation in the fibers is minimized by converting the photon's wavelength to the telecom S-Band via polarization-preserving quantum frequency conversion. This enables to observe entanglement between the atomic quantum memory and the emitted photon after passing 101 km of optical fiber with a fidelity better than 70.8$pm$2.4%. The fidelity, however, is no longer reduced due to loss of coherence of the atom or photon but in the current setup rather due to detector dark counts, showing the suitability of our platform to realize city-to-city scale quantum network links." @default.
- W4386080607 created "2023-08-23" @default.
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- W4386080607 date "2023-08-17" @default.
- W4386080607 modified "2023-09-27" @default.
- W4386080607 title "Long-lived quantum memory enabling atom-photon entanglement over 101 km telecom fiber" @default.
- W4386080607 doi "https://doi.org/10.48550/arxiv.2308.08892" @default.
- W4386080607 hasPublicationYear "2023" @default.
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