Molecular coating cleans up noisy quantum light:
Quantum technologies demand perfection: one photon at a time, every time, all with the same energy ...
phys.org/news/2025-10-molecular-coating-noisy-quantum.html
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PTCDA Layer Stabilizes Single-Photon SourcesResearchers report an 87% gain in spectral purity after coating atomically thin tungsten diselenide with PTCDA.
- Northwestern University engineers coated both sides of atomically thin tungsten diselenide with a molecular layer of PTCDA.
- It increased spectral purity by 87%, shifted photon color controllably, lowered activation energy, and preserved the semiconductor’s properties.
- Defects in the two-dimensional semiconductor emit single photons but remain vulnerable to contaminants in the atmosphere.
- The team plans to study other semiconductors and molecular coatings and drive emission electrically for quantum networks.
The big idea is that we want to go from individual quantum computers to quantum networks, and ultimately, a quantum internet. Quantum communication will occur using single photons. Our technology will help build single-photon sources that are stable, tunable and scalable—the essential components for making that vision a reality.— Mark C. Hersam, study's corresponding author at Northwestern University
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