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    9. **Stephen Wiesner (1970)**  
-   * Introduced the concepts of quantum cryptography and quantum money, making significant contributions to the development of secure communication systems. Wiesner's work laid the groundwork for the field of quantum cryptography.  
-   
+   * Introduced the concepts of quantum cryptography and quantum money, making significant contributions to the development of secure communication systems. Wiesner's work laid the groundwork for the field of quantum cryptography.
+
+   * **Quantum Money [Quantum Currency]()**
+     
+     - Wiesner's idea of "quantum money" suggests using quantum states to encode currency, making it practically impossible to forge due to the properties of quantum states.  
+     - The exact mathematical formulation varies depending on the implementation, but the general idea relies on quantum superposition and entanglement to ensure security and authenticity.  
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+   #