On solving quantum many-body problems by experiment

Understand

Knowledge of all correlation functions of a system is equivalent to solving the corresponding many-body problem.

• Already a finite set of correlation functions can be sufficient to describe a quantum many-body system if correlations factorise, at least approximately.
• While being a powerful theoretical concept, an implementation based on experimental data has so far remained elusive.
• Here, this is achieved by applying it to a non-trivial quantum many-body problem: A pair of tunnel-coupled one-dimensional atomic superfluids.