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Quantum key formation using BB84 protocol
| Alice’s quantum basis | + | + | X | + | X | + | X | + | + |
| Alice’s binary bit (secret bit stream) | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 |
| Alice’s qubit | ↑ | → | ↗ | ↑ | ↖ | → | ↗ | ↑ | ↑ |
| Bob’s random guess of quantum basis | X | + | + | X | X | X | X | + | X |
| Bob’s random guess binary bit (secret bit stream) | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 |
| Bob’s qubit | ↗ | → | ↑ | ↗ | ↖ | ↖ | ↗ | ↑ | ↗ |
| Matched bits | 0 | 0 | 1 | 1 |
