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Q: Fachverband Quantenoptik und Photonik

Q 41: Quantum Information (Quantum Communication and Quantum Repeater) I

Q 41.7: Vortrag

Donnerstag, 12. März 2020, 12:45–13:00, e001

Orchestrating parametric down conversion temporal modes — •Jano Gil Lopez, Vahid Ansari, Benjamin Brecht, and Christine Silberhorn — Paderborn Universität, Warburgerstr. 100 33098 Paderborn

Photon temporal modes (TM) are a powerful tool for quantum information science (QIS). They span a high-dimensional Hilbert space, which is compatible with spatially single-mode fibres. QIS can benefit from such high-dimensional spaces; they provide an increase in the security of quantum key distribution as well as in the information capacity of photons, while allowing for the utilisation of off-the-shelf telecommunication components. These advantages can be improved further, if the distribution of TMs is tailored to be equally distributed over a controlled number of effective modes, thereby producing maximally entangled states. We implement an engineered parametric down conversion source of controlled TM bi-photon states with equally-weighted mode distribution. The states are characterised through joint spectral intensity and second order correlation measurements. We demonstrate the generation of maximally entangled states in up to six dimensions, where the dimensionality is limited only by experimental imperfections.