A minimally invasive pair of weak measurements on an atomic BEC yields the two-time density-density correlation function (Van Hove function) and its Fourier transform, the dynamical structure factor.
Kamenev, Many-body theory of non-equilibrium sys- tems (2005), arXiv:cond-mat/0412296 [cond-mat.dis-nn]
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Repeated weak measurements: watching quantum correlations evolve
A minimally invasive pair of weak measurements on an atomic BEC yields the two-time density-density correlation function (Van Hove function) and its Fourier transform, the dynamical structure factor.