Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Posters: Quantum Optics and Photonics IV

Q 54.42: Poster

Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof

Manipulating the complex-valued temporal shape of a photon — •Stefan Langenfeld, Olivier Morin, Matthias Körber, Philip Thomas, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching

Single photons are the most used carrier to transfer qubits over a quantum network. Over the last decades many platforms were developed in order to absorb and emit single photons. To stay in the quantum regime, the success of these operations relies on the perfect control of all degrees of freedom of the electromagnetic field. The temporal mode function is explicitly challenging to handle experimentally. Most platforms do not offer large and accurate flexibility on this particular degree of freedom making the connection of multiple devices difficult. Here, we investigate thoroughly the possibilities offered by a cavity quantum electrodynamics (QED) system, namely a single ⁸⁷Rb atom in a high finesse cavity. Starting from previous theoretical works [1,2], we developed a comprehensive and exhaustive model of our system [3]. Thanks to this, we experimentally demonstrate a very high control of the temporal mode of a single photon in amplitude and phase. This opens up various possibilities as for instance modifying the temporal shape by 3 orders of magnitude in bandwidth. It also shows that our platform can be compatible with many others and can even be used as a photon shape converter.

[1] A. Gorshkov et al., Phys. Rev. A 76, 033804 (2007).

[2] L. Giannelli et al., New J. Phys. 20, 105009 (2018).

[3] O. Morin et al., Phys. Rev. Lett. 123, 133602 (2019).