Applications of quantum key distribution are becoming more diverse due to the increase in interest in the secure key sharing protocol. Transmission through free-space channels has risen in popularity in recent years, primarily due to global coverage using satellite platforms. However, free-space channels come with challenges that need to be addressed, such as; diffraction loss, background noise, pointing-and-tracking, and atmospheric aberration. Novel design and use of state-of-the-art detector technologies in quantum receivers can help alleviate these difficulties. This paper presents and discusses the implementation of 2D single-photon sensor technology for free-space quantum key distribution. We present an experimental method that utilizes independent single-photon avalanche diode pixel read-out to reduce background noise contributions while simultaneously increasing optical field-of-view. Finally, we show and discuss single-photon level beaconing capabilities for pointing and tracking.
|Title of host publication||Quantum Technology: Driving Commercialisation of an Enabling Science II|
|Publication status||Published - 6 Oct 2021|
|Event||SPIE Photonex 2021 - Glasgow, United Kingdom|
Duration: 28 Sep 2021 → 30 Sep 2021
|Name||Proceedings of SPIE|
|Conference||SPIE Photonex 2021|
|Period||28/09/21 → 30/09/21|