University of Bonn Physicists Discover New Phase Transition in Optical Bose-Einstein Condensate of Light Particles

Posted Apr 19, 2021

About ten years ago, researchers at the University of Bonn produced an extreme aggregate state for the first time and presented a completely new light source from a single "super photon" made up of many thousands of individual light particles. The state is called optical Bose-Einstein condensate and has captivated many physicists ever since because this exotic world of light particles is home to its very own physical phenomena.

Researchers led by Prof. Dr. Martin Weitz, who discovered the super photon, and theoretical physicist Prof. Dr. Johann Kroha have returned from their latest experiment of the quantum world with a very special observation. They reported a new, previously unknown phase transition in the optical Bose-Einstein condensate. This is a so-called overdamped phase. The results may in the long term be relevant for encrypted quantum communication. The study has been published in the journal Science.

The Bose-Einstein condensate is an extreme physical state that usually only occurs at very low temperatures. The particles in this system are no longer distinguishable and are predominantly in the same quantum mechanical state, in other words, they behave like a single giant "superparticle". The state can therefore be described by a single wave function.

In 2010, researchers led by Martin Weitz succeeded for the first time in creating a Bose-Einstein condensate from light particles (photons). Their special system is still in use today in which physicists trap light particles in a resonator made of two curved mirrors spaced just over a micrometer apart that reflect a rapidly reciprocating beam of light. The space is filled with a liquid dye solution, which serves to cool down the photons. This is done by the dye molecules "swallowing" the photons and then spitting them out again, which brings the light particles to the temperature of the dye solution - equivalent to room temperature. This system makes it possible to cool light particles because their natural characteristic is to dissolve when cooled.

Clear Separation of Two Phases

Phase transition is what physicists call the transition between water and ice during freezing. The somewhat translucent mirrors cause photons to be lost and replaced, creating a non-equilibrium that results in the system not assuming a definite temperature and being set into oscillation. This creates a transition between this oscillating phase and a damped phase. Damped means that the amplitude of the vibration decreases.

The overdamped phase observed corresponds to a new state of the light field. The special characteristic is that the effect of the laser is usually not separated from that of Bose-Einstein condensate by a phase transition, and there is no sharply defined boundary between the two states. This means that physicists can continually move back and forth between effects.

However, in the recent experiment, the overdamped state of the optical Bose-Einstein condensate is separated by a phase transition from both the oscillating state and a standard laser. This shows that there is a Bose-Einstein condensate, which is a different state than the standard laser. In other words, the experiment deals with two separate phases of the optical Bose-Einstein condensate.

The researchers plan to use their findings as a basis for further studies to search for new states of the light field in multiple coupled light condensates, which can also occur in the system. If suitable quantum mechanically entangled states occur in coupled light condensates, this may be interesting for transmitting quantum-encrypted messages between multiple participants.


The study received funding from the Collaborative Research Center TR 185 "OSCAR - Control of Atomic and Photonic Quantum Matter by Tailored Coupling to Reservoirs" of the Universities of Kaiserslautern and Bonn and the Cluster of Excellence ML4Q of the Universities of Cologne, Aachen, Bonn and the Research Center Jülich, funded by the German Research Foundation. The Cluster of Excellence is embedded in the Transdisciplinary Research Area (TRA) "Building Blocks of Matter and Fundamental Interactions" of the University of Bonn. In addition, the study was funded by the European Union within the project "PhoQuS - Photons for Quantum Simulation" and the German Aerospace Center with funding from the Federal Ministry for Economic Affairs and Energy.