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Why emergence matters in quantum physics

When many quantum particles interact, the system often exhibits properties that cannot be predicted from the behavior of individual particles, a phenomenon known as emergence. Understanding these effects is crucial for explaining complex quantum systems and guiding experiments in areas such as condensed matter physics and astrophysics.

Van de Kraats focused on the strongly correlated regime, where conventional theories break down due to the appearance of non-Gaussian correlations. Unlike Gaussian distributions, which describe most natural systems, non-Gaussian statistics signal deep complexity and strong multi-particle interactions.

From three-body physics to many-body dynamics

In the first part of his thesis, Van de Kraats studied Efimov states, exotic three-body bound states that appear near scattering resonances. Using a novel theoretical approach that accounts for the full spin structure of alkali-metal atoms, he resolved a long-standing fundamental problem in his field of physics: the lithium few-body puzzle. His model achieves unprecedented accuracy and has not only advanced the state of the art, but also laid the foundation for ongoing and future research within his research group and beyond.

The second part of his research explored interaction quenches in macroscopic quantum gases, where systems are suddenly driven into the strongly correlated regime. Van de Kraats showed how non-Gaussian correlations emerge dynamically and demonstrated that three-particle clusters play a key role in this process. His work also connects these correlations to quantum entanglement, proposing a feasible method to measure entanglement in current experiments.

Advanced models for modern quantum experiments

To tackle these challenges, Van de Kraats developed state-of-the-art numerical models, optimized for high-performance computing. These tools enable researchers to analyze complex quantum systems with unprecedented precision, supporting the design and interpretation of cutting-edge quantum simulation experiments.

A step forward in understanding quantum matter

By resolving theoretical puzzles and introducing powerful computational methods, Van de Kraats’ work deepens our understanding of strongly correlated quantum systems and opens new avenues for experimental exploration. His research exemplifies the synergy between theory and experiment that drives progress in modern physics.