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Title: | High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion |
Author(s): | Bock, Matthias Kucera, Stephan Kreis, Matthias Lenhard, Andreas Becher, Christoph Eschner, Jürgen |
Language: | English |
Title: | Nature Communications |
Volume: | 9 |
Issue: | 1 |
Publisher/Platform: | Nature Publishing Group UK |
Year of Publication: | 2018 |
Publikation type: | Journal Article |
Abstract: | Entanglement between a stationary quantum system and a flying qubit is an essential ingredient of a quantum-repeater network. It has been demonstrated for trapped ions, trapped atoms, color centers in diamond, or quantum dots. These systems have transition wavelengths in the blue, red or near-infrared spectral regions, whereas long-range fiber-communication requires wavelengths in the low-loss, low-dispersion telecom regime. A proven tool to interconnect flying qubits at visible/NIR wavelengths to the telecom bands is quantum frequency conversion. Here we use an efficient polarization-preserving frequency converter connecting 854 nm to the telecom O-band at 1310 nm to demonstrate entanglement between a trapped 40Ca+ ion and the polarization state of a telecom photon with a high fidelity of 98.2 ± 0.2%. The unique combination of 99.75 ± 0.18% process fidelity in the polarization-state conversion, 26.5% external frequency conversion efficiency and only 11.4 photons/s conversion-induced unconditional background makes the converter a powerful ion–telecom quantum interface. |
DOI of the first publication: | 10.1038/s41467-018-04341-2 |
URL of the first publication: | https://www.nature.com/articles/s41467-018-04341-2 |
Link to this record: | hdl:20.500.11880/27645 |
ISSN: | 2041-1723 |
Date of registration: | 10-Aug-2019 |
Faculty: | NT - Naturwissenschaftlich- Technische Fakultät |
Department: | NT - Physik |
Professorship: | NT - Prof. Dr. Jürgen Eschner |
Collections: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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