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We introduce local filters as a means to detect the entanglement of boundentangled states which do not yield to detection by witnesses based on positive(P) maps which are not completely positive (CP). We demonstrate how suchnon-detectable bound entangled states can be locally filtered into detectablebound entangled states. Specifically, we show that a bound entangled state inthe orthogonal complement of the unextendible product bases (UPB), can belocally filtered into a another bound entangled state that is detectable by theChoi map. We reinterpret these filters as local measurements on locallyextended Hilbert spaces. We give explicit constructions of a measurement-basedimplementation of these filters for $2 \otimes 2$ and $3 \otimes 3$ systems.This provides us with a physical mechanism to implement such local filters.

Measurement-based local quantum filters and their ability to transform quantum entanglement