New light source advances quantum communication with extremely bright entangled photons

Recent advances quantum Advances in quantum communication technology have led scientists to develop extremely bright light sources that can generate entangled photons, an innovation that holds great promise for the future of secure, fast quantum communication. The study, published July 24 in the journal eLight, reveals that a combination of existing technologies has produced a more robust quantum signal source that is essential for building a widespread and effective quantum internet.

Combining technologies to enhance quantum signals

This groundbreaking the studyScientists from Europe, Asia and South America combined two key technologies that had previously been tested separately. They integrated photon dot emitters, which generate single photons, with quantum resonators, devices designed to enhance quantum signals. The combination created a newly developed light source with extraordinary brightness and quantum properties. They then used piezoelectric actuators, which generate electricity when subjected to pressure or heat, to fine-tune the emitted photons to ensure maximum entanglement and coherence.

Enhanced Photons Emitter We generate photon pairs with high entanglement fidelity and extraction efficiency, which means that the photons not only maintain their quantum properties over distance but also have the brightness required for practical applications. Achieving both high brightness and strong entanglement fidelity simultaneously has been a challenging task, as it requires different technologies that are typically difficult to integrate effectively.

Challenges and future directions

Despite these advances, the quantum internet is still a long way from practical use. The technology relies on materials such as gallium arsenide, which raises safety concerns due to its toxicity. These hazards may limit the scalability of the technology and necessitate the development of safer alternative materials.

The next stage in the development process will focus on integrating diode-like structures into the piezoelectric actuator: this addition will generate an electric field across the quantum dot, suppressing decoherence and further enhancing photon entanglement.