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Experimental tests of coherence and entanglement conservation under unitary evolutions

Experimental tests of coherence and entanglement conservation under unitary evolutions

We experimentally demonstrate the migration of coherence between composite quantum systems and their subsystems. The quantum systems are implemented using polarization states of photons in two experimental setups. The first setup is based on a linear optical controlled-phase quantum gate and the second scheme utilizes effects of nonlinear optics. Our …