Practical Free-Space QKD Enabled Optical Links by SNSPDs
ID Quantique (IDQ) is always thrilled to see new research enabled by the very best single-photon detection technology, which is Superconducting Nanowire Single-Photon Detectors (SNSPDs). Recently, two groups published exciting results using free-space optical links for quantum communication with IDQ’s SNSPD technology.
In one paper, the authors report on a study of the effect of atmospheric turbulence on finite-size decoy-state BB84 quantum key distribution (QKD). They demonstrated the possibility of operating QKD in a turbulent and highly lossy (40 dB) channel using high efficiency and low noise SNSPDs. The paper also shows the huge improvement SNSPDs brought when compared to other detection technologies. The paper describing this study is entitled, “Experimental Free-Space Quantum Key Distribution Over a Turbulent High-Loss Channel”
In another collaboration, the team demonstrated a QKD system designed for full daylight operation at 1550 nm. The team was able to remove a large portion of the noise coming from the sun’s background radiation, and they obtained a final QBER of 0.5% – quite impressive! The paper for this study is “Full daylight quantum-key-distribution at 1550 nm enabled by integrated silicon photonics.”
These results demonstrate that the harm caused by turbulence and daylight operation can be dealt with for QKD. They represent significant steps towards global-scale quantum networks using free-space and fiber links. They also highlight the critical role of SNSPDs in pushing scientific boundaries.
Learn more about IDQ’s Clavis XGR QKD system that can operate over >40 dB of loss with the new ID281 Pro SNSPD technology.
About ID Quantique
ID Quantique (IDQ), founded in 2001, initially operated as a spin-off company of the University of Geneva, working on research projects to demonstrate the feasibility of quantum key distribution (or QKD, also known as quantum cryptography). In late 2003, IDQ developed the first QKD product for data centers to protect data in transit. 20 years later, IDQ released its 4th generation of quantum key distribution systems and remains the market leader in quantum safe cryptography and quantum sensing solutions. It maintains close ties with academic institutions by participating in numerous research programs and plays a leading role in cutting-edge projects to drive innovation to the market.
To request more information or a quotation for any ID Quantique products, contact IL Photonics.