Researchers at the Max Planck Institute for the Science of Light have overcome a key challenge in quantum physics by creating ultra-clean surfaces that allow individual molecules to exhibit their delicate quantum properties at the fundamental limit of optical coherence.
- Molecules on surfaces reach ultimate quantum coherence limit
- Novel cleaning method uses sublimation of organic crystals
- Quantum stability at ultra-low temperatures enables new tech prospects
What happened
Scientists at the Max Planck Institute for the Science of Light developed a method to create exceptionally clean surfaces by exploiting the natural sublimation of organic crystals at room temperature. By slowly evaporating the crystal’s upper layers inside a vacuum chamber and then cooling the surface to near absolute zero, they produced an exceptionally stable environment free from contaminants.
On this ultra-clean and cold surface, molecules were deposited and found to maintain their fragile quantum coherence for the longest possible duration allowed by physics – the Fourier limit. This marks a first in quantum research, where molecules attached directly to a surface preserve their quantum optical properties as stably as those held in vacuum or solid matrices.
Why it feels good
This achievement removes a major barrier in studying and controlling quantum emitters—tiny systems that produce single photons and store quantum information—directly on surfaces. Surfaces are usually challenging environments due to contamination and vibrations that quickly degrade quantum states. The new technique clears those hurdles, providing an unprecedented level of control.
Maintaining molecular quantum coherence on surfaces means scientists can now explore interactions between molecules and materials at the highest precision. This is crucial for advancing quantum technologies such as computing and secure communications, which rely on stable quantum states to function effectively.
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The breakthrough opens exciting opportunities for integrating quantum emitters with scanning probe methods like atomic force microscopy, where individual molecules can be manipulated and studied in detail. This hands-on approach could lead to new ways of engineering quantum devices and sensors at the atomic scale.
Future research will likely build upon this clean surface technique to explore diverse molecules and materials, potentially expanding quantum experiments beyond highly controlled laboratory settings. Keep an eye on developments from the Max Planck Institute’s Nano-Optics Division as they continue pushing the limits of molecular quantum science.