  Quantum-to-classical transition is a fundamental open question in physics
frontier. Quantum decoherence theory points out that the inevitable interaction
with environment is a sink carrying away quantum coherence, which is
responsible for the suppression of quantum superposition in open quantum
system. Recently, quantum Darwinism theory further extends the role of
environment, serving as communication channel, to explain the classical
objectivity emerging in quantum measurement process. Here, we used a six-photon
quantum simulator to investigate classical and quantum information
proliferation in quantum Darwinism process. In the simulation, many
environmental photons are scattered from an observed quantum system and they
are collected and used to infer the system's state. We observed redundancy of
system's classical information and suppression of quantum correlation in the
fragments of environmental photons. Our results experimentally show that the
classical objectivity of quantum system can be established through quantum
Darwinism mechanism.
