  We study the entanglement between a certain qubit and the remaining system in
the Schr\"odinger cat state prepared on the ibmq-melbourne quantum computer.
The protocol, which we use for this purpose, is based on the determination of
the mean value of spin corresponding to a certain qubit. We explore the
dependence of the entanglement on a parameter of the Schr\"odinger cat state
which consists of different numbers of qubits. In addition, we explore the
entanglement of each qubit with the remaining system in the maximum entangled
Schr\"odinger cat state.
