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

Matthias Bock, Pascal Eich, Stephan Kucera, Matthias Kreis, Andreas Lenhard, Christoph Becher () and Jürgen Eschner ()
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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

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-04341-2

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