  It is well-known that decoherence is a crucial barrier in realizing various
quantum information processing tasks; on the other hand, it plays a pivotal
role in explaining how a quantum system's fragile state leads to the robust
classical state. Zurek [Nat. Phys. 5, 181-188 (2009)] has developed the theory
which successfully describes the emergence of classical objectivity of quantum
system via decoherence, introduced by the environment. Here, we consider two
systems for a model universe, in which the first system shows a random quantum
state, and the other represents the environment. We take 2-, 3-, 4-, 5- and
6-qubit quantum circuits, where the system consists of one qubit and the rest
qubits represent the environment qubits. We experimentally realize the
Darwinism state constructed by this system's ensemble on two real devices,
ibmq_athens and ibmq_16_melbourne. We then use the results to investigate
quantum-classical correlation and the mutual information present between the
system and the environment.
