Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Communication I

Q 2.6: Vortrag

Montag, 6. März 2017, 16:00–16:15, P 3

Spectral properties of single photons from a single Ca⁺ ion — •Philipp Müller, Tristan Tentrup, Marc Bienert, Jürgen Eschner, and Giovanna Morigi — Universität des Saarlandes, Experimentalphysik, Campus E 2.6, Saarbrücken

Pure photonic quantum states, such as Fourier-limited single photons, are optimal qubit carriers to attain high bandwidth in quantum communication. They are generated, for example, from a single trapped ion in a Raman-scattering process [1, 2]. The same process allows heralded single-photon absorption [3].

We developed a method, based on resolvent theory and the residue theorem, to calculate the spectro-temporal properties of the Raman-emitted photon for incident light of arbitrary spectrum and for excitation by coherent light or by single photons. We particularly include the branching ratio of the three-level system.

Application to the experimental situation of a trapped single Ca⁺ ion allows us to control the atom–photon interaction, optimise the photon-generation efficiency, and generate single photons with tailored properties.

[1] Almendros et al., Phys. Rev. Lett. 103, 213601 (2009).

[2] Kurz et al., New J. Phys. 15, 055005 (2013).

[3] Kurz et al., Phys. Rev. A 93, 62348 (2016).