Related papers: Long-lived quantum memory enabling atom-photon entanglement over 101 km telecom fiber

Long-lived quantum memory enabling atom-photon entanglement over 101 km telecom fiber

URL: http://arxiv.org/abs/2308.08892v2
Date: Mon, 21 Aug 2023 15:26:46 GMT
Title: Long-lived quantum memory enabling atom-photon entanglement over 101 km telecom fiber
Authors: Yiru Zhou, Pooja Malik, Florian Fertig, Matthias Bock, Tobias Bauer, Tim van Leent, Wei Zhang, Christoph Becher, Harald Weinfurter
Abstract summary: We report on 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. 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%.
Score: 2.4298261290423233
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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.

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