No-Cloning Theorem

It is impossible to create an identical copy of an arbitrary unknown quantum state.

Core Principles & Analysis

• Proved in 1982 by William Wootters and Wojciech Zurek, and independently by Dennis Dieks.
• Follows directly from the linearity of quantum mechanics.
• Guarantees that eavesdropping is detectable in quantum key distribution protocols like BB84.

Specifications & Metrics

• SYMBOL: U|ψ⟩|0⟩ ≠ |ψ⟩|ψ⟩