Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum Information (Quantum Communication) I

Q 34.1: Talk

Wednesday, March 13, 2019, 14:00–14:15, S HS 002 Chemie

High-resolution spectroscopy of deterministically generated single photons from a single ⁴⁰Ca⁺ ion — •Matthias Kreis, Konstantin Klein, Jurek Frey, Chrisitan Haen, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken

Single photons with well-controlled spectral and temporal properties are an essential resource for optical quantum communication protocols. Complementing existing work on the temporal shape of such photons, here we report on the measurement of their spectra, theoretically treated in [1].

We investigate single photons generated from a single ⁴⁰Ca⁺-ion by a controlled Raman scattering process in the Λ-shaped 3-level configuration consisting of the D_5/2 (m=−5/2), P_3/2 (m=−3/2), and S_1/2 (m=−1/2) Zeeman states.

The spectra are measured with a temperature-stable, 396-mm long Fabry-Perot cavity with 620 kHz linewidth, a finesse of 611 and 6 % on-resonance transmission, actively stabilized to a 393-nm laser resonant to the ion. Photons are generated with up to 150 kHz repetition rate and detected behind the cavity with up to 30 Hz count rate.

[1] P. Müller et al., Phys. Rev. A 96, 023861 (2017).