  Quantum error correction in general is experimentally challenging as it
requires significant expansion of the size of quantum circuits and accurate
performance of quantum gates to fulfill the error threshold requirement. Here
we propose a method much simpler for experimental implementation to correct
arbitrary detection errors. The method is based on processing of data from
repetitive experiments and can correct detection error of any magnitude, as
long as the error magnitude is calibrated. The method is illustrated with its
application to detection of multipartite entanglement from quantum state
engineering.
