  It is well-known that the violation of a local uncertainty relation can be
used as an indicator for the presence of entanglement. Unfortunately, the
practical use of these non-linear witnesses has been limited to few special
cases in the past. However, new methods for computing uncertainty bounds became
available. Here we report on an experimental implementation of
uncertainty-based entanglement witnesses, benchmarked in a regime dominated by
strong local noise. We combine the new computational method with a local noise
tomography in order to design noise-adapted entanglement witnesses. This
proof-of-principle experiment shows that quantum noise can be successfully
handled by a fully quantum model in order to enhance entanglement detection
efficiencies.
