Quantum entanglement does not violate the principle of special theory of relativity

摘要

Quantum entangled state suggests a strong correlation between the measurement outcomes of two separated qubits of entangled states. We might imagine that we may use the physical property of the entangled state to communicate with the speed faster than that of light. If such superluminal communication was really possible, it would mean that quantum mechanics does not go well with the special theory of relativity. We will discuss that such communications are not possible, in principle, due to no cloning theorem even though quantum entangled states show strong correlations in measurement outcomes.