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HL: Fachverband Halbleiterphysik

HL 34: Quantum Dots and Wires: Telecom Wavelength

HL 34.3: Vortrag

Mittwoch, 11. März 2026, 17:00–17:15, POT/0051

InGaAs/GaAs preparation at 1.55 micrometer telecom wavelengths — •Juwana Jose, André Strittmatter, Armin Dadgar, Jürgen Bläsing, and Usha Velpuri — Otto von guericke university, Magdeburg, Germany

Quantum key distribution is a secure way of generating and sharing encryption keys using photons. Single photons as qubits for key generation is an efficient method of secure data transmission. It guarantees absolute eavesdropping detection since it is impossible to copy a quantum state. Qubit transmission at telecom wavelengths of 1.55 micrometer using InGaAs quantum dots on GaAs substrates is a challenge. We explore the conventional Stranski-Krastanow growth mode to shift the wavelengths far beyond the spectral 1.3-1.4 *m region. Photoluminescence experiments on high-density QD ensembles show remarkable intensities in a wavelength range of 1.5-1.6 micrometer at room-temperature. This luminescence shifts by xx nm into the blue upon cooling down to 15 K. By tailoring the thickness of the initial InGaAs deposition to the 2D/3D transition region low QD densities of 108 cm-2 and below are achieved. Single photon emission experiments will be conducted after preparation of individual QD emitters.

Keywords: telecom wavelength; GaAs; single photon emission; MOVPE; quantum dots