If Alice and Bob are using quantum key distribution with light polarization and the BB84 protocol, given the information...
If Alice and Bob are using quantum key distribution with light polarization and the BB84 protocol, given the information below, write the resulting key Alice and Bob use in the blank
⟷ = 0
↕︎ = 1
⤡ = 0
⤢ = 1
Alice sends:
| ⤢ | ↕︎ | ↔︎ | ⤢ | ↕︎ | ↕︎ | ⤢ | ↔︎ | ↔︎ | ⤡ | ↕︎ | ⤡ |
Bob uses filters:
| ╳ | ＋ | ＋ | ＋ | ╳ | ＋ | ╳ | ╳ | ＋ | ＋ | ╳ | ╳ |
The key they agree on is
Homework Answers
| basis | 1 | 0 |
| + | ↕︎ | ⟷ |
| X | ⤢ | ⤡ |
| Alice's random bit | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 |
| Alice's random sending basis | X | + | + | X | + | + | X | + | + | X | + | X |
| Photon polarization Alice sends | ⤢ | ↕︎ | ↔︎ | ⤢ | ↕︎ | ↕︎ | ⤢ | ↔︎ | ↔︎ | ⤡ | ↕︎ | ⤡ |
| Bob's random measuring basis | X | + | + | + | X | + | X | X | + | + | X | X |
| Photon polarization Bob measures | ⤢ | ↕︎ | ↔︎ | ↕︎ | ⤢ | ↕︎ | ⤢ | ⤡ | ↔︎ | ↔︎ | ⤢ | ⤡ |
| Shared Secret Key | 1 | 1 | 0 | 1 | 1 | 0 | 0 |
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