SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 12: Integrated Photonics I (joint session Q/QI)

QI 12.4: Talk

Tuesday, March 7, 2023, 12:00–12:15, E001

Realisation of an integrated source for Gaussian boson sampling — Laura Padberg, •Simone Atzeni, Michael Stefszky, Kai Hong Luo, Harald Herrmann, Benjamin Brecht, Christof Eigner, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

Photonic quantum computing based on Gaussian Boson Sampling (GBS) is a quickly emerging research field, whose first implementations have demonstrated the role of single-mode squeezed states at telecom wavelength as key resources. Generally, the generation of these states relies on the process of parametric down-conversion in a nonlinear crystal, where care has to be taken to ensure that spectral correlations in the source do not lead to the generation of undesired multi-mode squeezed states. Due to its unique dispersion properties, bulk potassium titanyl phosphate (KTP) is typically employed for the generation of single-spectral-mode squeezed states at telecom wavelength. However, the performance of KTP sources will benefit from the enhanced light-matter interaction of a waveguide approach.

Here, we present the modelling, characterisation, and fabrication of a waveguide in periodically poled rubidium-doped KTP (ppRb:KTP). This system can act as a high-quality integrated source of single-mode squeezed states at telecom wavelength and can be readily employed in a GBS photonic processor.