Exotic Multibody Collisions Revealed

At extremely low temperatures, atoms can aggregate into so-called Bose-Einstein condensates (BEC) forming coherent laserlike matter waves. Due to interactions between the atoms, fundamental quantum dynamics emerge and give rise to periodic collapses and revivals of the matter wave field.

A group of scientists led by Immanuel Bloch, professor and chair of experimental physics at the Ludwig-Maximilians-University of Munich (LMU) and director of the quantum many body systems division at the Max Planck Institute of Quantum Optics in Garching, has now succeeded in glancing "behind the scenes" of atomic interactions, revealing the complex structure of these quantum dynamics.

Collapse and revival of the matter wave field: The quantum dynamics of Bose-Einstein condensates trapped in an optical lattice reveal exotic multi-body interactions. The image shows a sequence of interference patterns of the atomic samples recorded in steps of 40 microseconds. A single cycle of the dynamics is highlighted (blue-orange).

By generating thousands of miniature BECs ordered in an optical lattice, the researchers were able to observe a large number of collapse and revival cycles over long periods of time. The experimental results imply that not only do the atoms interact pairwise – as was typically assumed – but they also perform exotic collisions involving three, four or more atoms at the same time. On the one hand, these results have fundamental importance for the understanding of quantum many-body systems. On the other hand, they pave the way for the generation of new exotic states of matter, based on such multibody interactions.

The experiment starts by cooling a dilute cloud of hundreds of thousands of atoms to temperatures close to absolute zero, approximately –273 degrees Celsius. At these temperatures, the atoms form a BEC, the quantum phase in which all particles occupy the same quantum state. Now an optical lattice is superimposed on the BEC: This is a kind of artificial crystal made of light with periodically arranged bright and dark areas, generated by the superposition of standing laser light waves from different directions. This lattice can be viewed as an "egg carton" on which the atoms are distributed. Whereas, in a real egg carton, each site is either occupied by a single egg or no egg, the number of atoms sitting at each lattice site is determined by the laws of quantum mechanics: Depending on the lattice height (i.e., the intensity of the laser beam), the single lattice sites can be occupied by zero, one, two, three and more atoms at the same time.

The use of those "atom number superposition states" is the key to the novel measurement principle developed by the researchers. The dynamics of an atom number state can be compared to the dynamics of a swinging pendulum. As pendulums of different lengths are characterized by different oscillation frequencies, the same applies to the states of different atom numbers. “However, these frequencies are modified by interatomic collisions. If only pairwise interactions between atoms were present, the pendulums representing the individual atom number states would swing synchronously and their oscillation frequencies would be exact multiples of the pendulum frequency for two interacting atoms,” explained Sebastian Will, graduate student.

Using a tricky experimental setup, the physicists tracked the evolution of the different superimposed oscillations over time. Periodically, interference patterns became visible and disappeared, again and again. From their intensity and periodicity, the physicists found unambiguous evidence that the frequencies are actually not simple multiples of the two-body case.

“This really caught us by surprise. We became aware that a more complex mechanism must be at work,” Will said. “Due to their ultralow temperature, the atoms occupy the energetically lowest possible quantum state at each lattice site. Nevertheless, Heisenberg’s uncertainty principle allows them to make – so to speak - a virtual detour via energetically higher lying quantum states during their collision. Practically, this mechanism gives rise to exotic collisions, which involve three, four or more atoms at the same time.”

The results reported in this work provide an improved understanding of interactions between microscopic particles. This may not only be of fundamental scientific interest, but find a direct application in the context of ultracold atoms in optical lattices. Owing to exceptional experimental controllability, ultracold atoms in optical lattices can form a "quantum simulator" to model condensed matter systems. Such a quantum simulator is expected to help understand the physics behind superconductivity or quantum magnetism. Furthermore, as each lattice site represents a miniature laboratory for the generation of exotic quantum states, experimental setups using optical lattices may turn out to be the most sensitive probes for observing atomic collisions.

For more information, visit: www.quantum-munich.de