Telecom‐Band Spontaneous Parametric Down‐Conversion in AlGaAs‐on‐Insulator Waveguides

Author:

Placke Marlon1ORCID,Schlegel Jan2,Mann Felix1,Della Casa Pietro2,Thies Andreas2,Weyers Markus2,Tränkle Günther2,Ramelow Sven13

Affiliation:

1. Institute for Physics Humboldt‐Universität zu Berlin Newtonstraße 15 12489 Berlin Germany

2. Ferdinand‐Braun‐Institut Gustav‐Kirchhoff‐Straße 4 12489 Berlin Germany

3. IRIS Adlershof, Humboldt‐Universität zu Berlin Zum Großen Windkanal 2 12489 Berlin Germany

Abstract

AbstractWidespread commercial adoption of telecom‐band quantum key distribution (QKD) will require fully integrated, room‐temperature transmitters. Implementing highly efficient spontaneous parametric down‐conversion (SPDC) on a platform that offers co‐integration of the pump laser has been an outstanding challenge. Here, using such a platform based on AlGaAs‐on‐insulator waveguides, telecom‐band SPDC (and SHG, second harmonic generation) is reported with exceedingly large efficiencies of 26 GHz generated pairs per mW over a 7 THz bandwidth, which would saturate the usable photon‐flux for a 70‐channel wavelength‐multiplexed QKD system at merely 1.7 mW of pump laser power.

Publisher

Wiley

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