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Indistinguishable photons from a trapped-ion quantum network node


Trapped atomic ions embedded in optical cavities are a promising platform to enable long-distance quantum networks and their most far-reaching applications. Here we achieve and analyze photon in-distinguishability in a telecom-converted ion-cavity system. First, two-photon interference of cavity photons at their ion-resonant wavelength is observed and found to reach the limits set by spontaneous emission. Second, this limit is shown to be preserved after a two-step frequency conversion replicating a distributed scenario, in which the cavity photons are converted to the telecom C band and then back to the original wavelength. The achieved interference visibility and photon efficiency would allow for the distribution and practical verification of entanglement between ion-qubit registers separated by several tens of kilometers.
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Dates and versions

cea-02438271 , version 1 (01-04-2020)
cea-02438271 , version 2 (17-10-2022)



M Meraner, A Mazloom, V Krutyanskiy, V Krcmarsky, J Schupp, et al.. Indistinguishable photons from a trapped-ion quantum network node. 2020. ⟨cea-02438271v1⟩
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