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Large-scale ( Macroscopic ) quantum coherence leads to very amazing phenomena. For instance, the Laser , Superconductivity , and Superfluidity are examples of highly coherent quantum systems. One example that shows the amazing possibilities of macroscopic quantum coherence is the Schrödinger's Cat thought experiement. Another example of quantum coherence is in a Bose-Einstein Condensate . Here, all the atoms that make up the condensate are in-phase. They are thus all described by a single quantum wavefunction. Their behavior is communal and inseparable until the coherence is destroyed.


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