+-----------------+
                  |     End User    |
                  |                 |
                  +-----------------+
                           ^
                           | Local Secure Interface 
                           | (e.g., the same physical hardware
                           | or a local secure network)
                           |
        +------------------+-------------------+
        |                                      |
        |                                      |
        V                                      V              
+----------------+     /--------\     +----------------+         
|                |--->( Quantum  )--->|                |
|                |    ( Internet )    |                |
|   Quantum      |     \--------/     |   Quantum      |
|   Computer A   |                    |   Computer B   |
| (e.g., Site #1)|     /--------\     | (e.g., Site #2)|
|                |    ( Classical)    |                |
|                |<-->( Internet )<-->|                |
+----------------+     \--------/     +----------------+