Table 1.
Example of a two user system with the complete set of two decoy-levels and signal states (u, v and a vacuum).
| key 1 | u 1 | u 1 | 0 | v 1 | u 1 | 0 | 0 | v 1 | v 1 |
| key 2 | u 2 | 0 | u 2 | u 2 | v 2 | 0 | v 2 | 0 | v 2 |
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