  The quantum entanglement is considered as one of the most important notions
of quantum computing. The entanglement is a feature of quantum systems and it
is used as a basis for many quantum algorithms and protocols. In this paper we
analyze the level of entanglement for the quantum switch, during its work. The
level of entanglement during the correct operating may be compared with the
situation when a noise is present in the analyzed system. The noise changes the
level of quantum entanglement and we utilize this observation to evaluate if
the switch works properly. We present the formulae describing the value of
entanglement with use of the Concurrence measure and also the value of entropy.
Both mentioned values may be utilized to detect the noise during the operating
of quantum switch.
