Project DeLiQuaT

The DeLiQuaT (Deterministic Light Sources for Quantum Technologies) project is dedicated to the development of innovative, electronically controllable single-photon sources based on quantum dots for quantum communication. The objective is to provide high-precision light sources that emit individual photons in a controlled and reliable manner – a key technology for hack-proof data transmission, quantum cryptography and the construction of future quantum networks.

As digitalization and connectivity advance, the need for secure communication solutions is intensifying. Traditional encryption methods are increasingly reaching their limits in the face of powerful computers and future quantum computers. However, the practical implementation of quantum communication still lacks stable, scalable single-photon sources that can be used in industry. Conventional light sources such as lasers don’t meet these requirements.

Project objective

DeLiQuaT aims to develop and comprehensively characterize novel single-photon sources based on quantum dots in order to make them usable specifically for the needs of quantum communication. The development of stable, electronically controllable light sources for industrial use lays the technological foundation for hack-proof communication and innovative applications such as quantum cryptography and quantum sensor technology. The project thus plays a key role in overcoming current challenges and paves the way for secure and sustainable information transmission in the digital age.

Finding the solution

DeLiQuaT relies on an interdisciplinary approach that combines innovative technologies and proven processes. The focus is on developing electronically controllable quantum dots as single-photon sources that can be integrated into electrode structures using modern microtechnological processes. To ensure efficient integration into communication systems, novel coupling optics are used that employ microlenses to couple light into single-mode fibers. DeLiQuaT characterizes the light sources using specialized measurement techniques and time-tagger technologies, supplemented by methods for photon number resolution. The project is being implemented in close cooperation with the following partners: TU Chemnitz, TU Dresden, HTW Dresden, Fraunhofer ENAS and Fraunhofer IIS, Engineering of Adaptive Systems EAS division. Together, they will cover all relevant development steps and create the basis for the industrial use of single-photon sources in quantum communication.

Over the long term, DeLiQuaT will help strengthen technological sovereignty in the field of quantum technology and increase the competitiveness of Saxony and Europe as a business location. The project results will lay the groundwork for further research and development activities as well as for the transfer to industrial applications and international collaborations.