Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory

Elena Arenskötter; Tobias Bauer; Stephan Kucera; Matthias Bock; Jürgen Eschner; Christoph Becher

doi:10.1038/s41534-023-00701-z

Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory

Quantum Physics 2024-04-30 v1

Authors: Elena Arenskötter , Tobias Bauer , Stephan Kucera , Matthias Bock , Jürgen Eschner , Christoph Becher

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Abstract

Entanglement-based quantum networks require quantum photonic interfaces between stationary quantum memories and photons, enabling entanglement distribution. Here we present such a photonic interface, designed for connecting a $^{40}$ Ca $^+$ single-ion quantum memory to the telecom C-band. The interface combines a memory-resonant, cavity-enhanced spontaneous parametric down-conversion (SPDC) photon pair source with bi-directional polarization-conserving quantum frequency conversion (QFC). We demonstrate preservation of high-fidelity entanglement during conversion, fiber transmission over up to 40 km and back-conversion to the memory wavelength. Even for the longest distance and bi-directional conversion the entanglement fidelity remains larger than 95 % (98 %) without (with) background correction.

Keywords

quantum memory quantum photonics single-photon sources

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@article{arxiv.2211.08841,
  title  = {Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory},
  author = {Elena Arenskötter and Tobias Bauer and Stephan Kucera and Matthias Bock and Jürgen Eschner and Christoph Becher},
  journal= {arXiv preprint arXiv:2211.08841},
  year   = {2024}
}

Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory

Abstract

Keywords

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