Vacuum-based Molecular Combination Process

In a groundbreaking development, a research group led by Professor Vahid Sandoghdar at the Max Planck Institute for the Science of Light (MPL) has achieved a significant milestone in the field of quantum technology. For the first time, they have succeeded in coupling spatially separated molecules using an optical microresonator.

Professor Sandoghdar, director at the MPL and head of the "Nano-Optics" Division, explains that this feat is particularly noteworthy because quantum states are fragile, and coupling multiple molecules is a complex task.

Atoms and molecules possess clearly defined, discrete energy levels. However, at distances of a few nanometers, the interaction between molecules becomes so weak that they can no longer communicate effectively. To overcome this challenge, the scientists inserted an anthracene microcrystal, doped with special dye molecules, into the resonator, which is only a few micrometers in size.

The team's innovative approach involves creating modified vacuum fields inside a plano-concave microresonator, where light can be stored for a longer period. By absorbing two photons from the resonator, the scientists were able to bring two molecules far apart into the excited state simultaneously, effectively 'binding' them optically.

This breakthrough lays the foundation for the development of new hybrid light-matter states. Professor Sandoghdar emphasises the importance of studying a precisely defined number of interacting emitters for quantum information processing in quantum technology.

Moreover, the physicists' work opens up the potential for developing novel states where material particles (molecules) are 'stuck together' with light. This could revolutionise the field, offering exciting possibilities for future research and applications in quantum technology.

The scientists' success in optically 'binding' multiple molecules over greater distances using an optical resonator represents a significant leap forward in our understanding of light-matter interactions at the quantum level. It is a testament to the ongoing efforts to push the boundaries of science and technology, and heralds a new era of possibilities in the realm of quantum information processing.