Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Quantum Information (Quantum Repeater)
Q 54.7: Talk
Thursday, March 17, 2022, 15:30–15:45, Q-H12
Simultaneous single-photon extraction from two 40Ca+ ions in a single trap — •Max Bergerhoff, Omar Elshehy, Stephan Kucera, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken
Atom-photon interfaces [1,2] are a basic requirement for any ion-based quantum network [3]. We are pursuing the implementation of a ’quantum repeater cell’ according to [4] on the basis of photon emission and absorption; some steps of the required functionality have been realized, such as high-fidelity entanglement between a single ion and a telecom photon [2].
Here, we report an experiment for creating atom-photon entanglement with two 40Ca+ ions in the same trap, separately coupled to single-mode fibers. We present the optical setup to separate the 854 nm photons from the two ions and characterize it with arrival time measurements of the photons.
The width of the wave packets of the separately collected photons gives us lower bounds for the quantum repeater functionality. We further discuss the g(2)-function obtained by correlating arrival times of the two wave packets. We detect 0.56 photon pairs per second.
[1] C. Kurz et al., Nat. Commun. 5, 5527 (2014)
[2] M. Bock et al., Nat. Commun. 9, 1998 (2018)
[3] H. Kimble, Nature 453, 1023-1030 (2008)
[4] D. Luong et al., Appl. Phys. B 122, 96 (2016)