Recent development in high quality low dimensional materials has allowed to store quantum information using the spin of single electrons. The electron spin is not only promising to store, but also to transfer quantum information, since electrons can travel coherently through a circuit. Quantum information is based on entanglement of individual particles, which are often called EPR pairs when the entanglement is shared between two partners. Very recently, great progress has been made towards the realization of electron entanglers, i.e. circuits which could generate spatially separated entangled electron pairs. Semiconductor nanowires and carbon nanotube based devices have been demonstrated, which allow the splitting of spin entangled Cooper pairs into separated electrons by using quantum dot based filters. The goal of the present proposal is to develop analyzer nanocircuits, which determine the degree of entanglement of electron pairs generated by such Cooper pair splitters. A way to address the entanglement follows the principle of quantum optics by performing spin projection measurements in suitable basis in both arms of the Cooper pair splitter. In this project semiconducting nanowire and/or carbon nanotube based devices will be fabricated with ferromagnetic and superconducting contacts and electrically analyzed at low temperature. Recent results on semiconductor nanowire based ferromagnetic/superconducting hybrid devices make these wires promising as ferromagnetic detectors. Realization of these analyzer units would allow the detection of electron entanglement for the first time and thereby advancing electron spin based quantum computation and communication technologies.