Cloning Quantum Information
Classical information can be easily cloned. When you xerox something, or forward an email, you are effectively cloning classical information.
Quantum information, in contrast, is inherently private. There is no way to create a clone of a quantum bit. If there were, one could create a clone – measure a certain variable (say position x) and create another (from the original) and measure momentum. This would violate the basic Uncertainty principle of QM.
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