  We propose an experimental scheme to verify the quantum non-equilibrium
fluctuation relations using current technology. Specifically, we show that the
characteristic function of the work distribution for a non-equilibrium quench
of a general quantum system can be extracted from Ramsey interferometry of a
single probe qubit. Our scheme paves the way for the full characterisation of
non-equilibrium processes in a variety of complex quantum systems ranging from
single particles to many-body atomic systems and spin chains. We demonstrate
our idea using a time-dependent quench of the motional state of a trapped ion,
where the internal pseudo-spin provides a convenient probe qubit.
