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Update docs/noise.md
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Co-authored-by: RolandMacDoland <[email protected]>
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chMoussa and RolandMacDoland authored Jan 8, 2025
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## Digital Noise

In the description of closed quantum systems, a pure state vector is used to represent the complete quantum state. Thus, pure quantum states are represented by state vectors $|\psi \rangle $.
In the description of closed quantum systems, the complete quantum state is a pure quantum state represented by a state vector $|\psi \rangle $.

However, this description is not sufficient to study open quantum systems. When the system interacts with its environment, quantum systems can be in a mixed state, where quantum information is no longer entirely contained in a single state vector but is distributed probabilistically.

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