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High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion

Author

Listed:
  • Matthias Bock

    (Universität des Saarlandes)

  • Pascal Eich

    (Universität des Saarlandes)

  • Stephan Kucera

    (Universität des Saarlandes)

  • Matthias Kreis

    (Universität des Saarlandes)

  • Andreas Lenhard

    (Universität des Saarlandes)

  • Christoph Becher

    (Universität des Saarlandes)

  • Jürgen Eschner

    (Universität des Saarlandes)

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.

Suggested Citation

  • Matthias Bock & Pascal Eich & Stephan Kucera & Matthias Kreis & Andreas Lenhard & Christoph Becher & Jürgen Eschner, 2018. "High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04341-2
    DOI: 10.1038/s41467-018-04341-2
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