Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 65: Quantum Information (Miscellaneous)
Q 65.5: Vortrag
Freitag, 18. März 2022, 11:30–11:45, Q-H12
Quantum interference and spectral properties of single photons generated from a single 40Ca+ ion — •Matthias Kreis, Jelena Ritter, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken
Generation of single photons by Raman scattering is a way of realizing an atom-photon quantum interface [1]. For quantum communication applications, well-controlled temporal and spectral properties are important, for example for the indistinguishability of photons from different senders.
We record spectra of single photons generated on the 393 nm (P3/2→ S1/2) and 854 nm (P3/2→ D5/2) transitions of a single trapped 40Ca+ ion, using frequency stabilized Fabry-Perot cavities as single-photon spectrometers. The temporal single-photon wave packets are recorded simultaneously.
We report comprehensively on the observed properties, including the time-bandwidth product, in dependence of the excitation parameters. We demonstrate the generation of photons narrower than the natural linewidth of the P3/2 state. We further discuss quantum interference effects in absorption and emission leading to an enhancement and suppression of the emission into certain frequency modes. For all cases, measured spectra are compared to model calculations extended from the theory in [2] and [3].
[1] C. Kurz et al., Phys. Rev. A 93, 062348 (2016).
[2] P. Müller et al., Phys. Rev. A 96, 023861 (2017).
[3] S. Zhu et al., Phys. Rev. A 52, 4791 (1995)