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QI: Fachverband Quanteninformation

QI 9: Photonic Quantum Technologies (joint session Q/QI)

QI 9.6: Vortrag

Dienstag, 7. März 2023, 12:15–12:30, A320

Ideal Single Photon Sources at Telecom Wavelengths — •Jonas Grammel¹, Julian Maisch², Simone Luca Portalupi², Peter Michler², and David Hunger¹ — ¹Physikalisches Institut, Karlsruher Institut für Technologie — ²Institut für Halbleiteroptik und Funktionelle Grenzflächen, Univer- sität Stuttgart

Semiconductor single photon sources are fundamental building blocks for quantum information applications. The current limitations of such quantum dot sources are the emitting wavelength and insufficient collection efficiency in fiber-based implementations. In the project Telecom Single Photon Sources we aim to realize high brightness, fiber coupled sources of single and indistinguishable photons at the telecom wavelength for the upcoming realization of fiber-based quantum networks. We employ open cavities realized with fiber-based mirrors, in combination with InGaAs quantum dots emitting in the telecom O-band and C-band. To achieve Fourier-limited photons we utilize the lifetime reduction of the emitters via the Purcell effect. We optimize the mode matching between the cavity mode and the guided fiber mode by introducing a fiber-integrated mode-matching optics that can basically reach near-unity collection efficiency.