Physicists Observe New Phase in Quantum Condensate of Light particles


The Bose-Einstein condensate is an extreme physical state that usually only occurs at very low temperatures. 

What's special: 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.

It was predicted in the 1920s by Satyendra Nath Bose and Albert Einstein and was eventually created in the lab in the 1990s at the University of Colorado Boulder, MIT and Rice University using laser cooling and evaporative cooling techniques.

In 2010, Professor Martin Weitz from the Institute of Applied Physics at the University of Bonn and colleagues created for the first time a Bose-Einstein condensate from photons.

“Our special system is still in use today: we 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,” they said.

“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.”

“The system makes it possible to cool light particles in the first place, 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. But how does the particular phase transition occur within the system of trapped light particles? 

The scientists explain it this way: 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 we observed corresponds to a new state of the light field, so to speak,” says lead author Fahri Emre Öztürk, a doctoral student at the Institute for Applied Physics at the University of Bonn. 

He added “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 we can continually move back and forth between effects.”

“However, in our 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,” said study leader Prof. Dr. Martin Weitz.

“This shows that there is a Bose-Einstein condensate, which is really a different state than the standard laser.”

“In other words, we are dealing 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," says Fahri Emre Öztürk.