New photonic crystal method improves single-photon sources for quantum networks
Quantum communication promises many advantages over today's standard technologies, including absolutely secure transmission of large amounts of data. However, it requires single photons—and generating them is very difficult. Researchers at the Technical University of Munich (TUM) and the Munich Center for Quantum Science and Technology (MCQST) have developed a new method that overcomes the…
A new method developed by researchers at the Technical University of Munich and the Munich Center for Quantum Science and Technology enhances single-photon sources for quantum networks. Traditional techniques use resonators to amplify desired frequencies, but these have limitations in frequency range and precise tuning. The new approach, utilizing photonic crystal waveguides, selectively suppresses unwanted frequencies without amplification.
This allows the emitter's environment to be adapted, preserving desired photons while minimizing unwanted ones. Initial experiments showed a significant increase in desired photons, from 23% to 72%. The technology, while slightly slower than previous methods, offers broader bandwidth and enables simultaneous use of multiple emitters.
These advancements lay the groundwork for reliable information transfer in quantum networks, connecting various quantum systems through interfaces that transmit individual photons via optical fibers.
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