Security of quantum key distribution using d-level systems
Preprint
- 26 July 2001
Abstract
We consider two quantum cryptographic schemes relying on encoding the key into qudits, i.e. quantum states in a d-dimensional Hilbert space. The first cryptosystem uses two mutually unbiased bases (thereby extending the BB84 scheme), while the second exploits all the d+1 available such bases (extending the six-state protocol for qubits). We derive the information gained by a potential eavesdropper applying a cloning-based individual attack, along with an upper bound on the error rate that ensures unconditional security against coherent attacks.Keywords
All Related Versions
- Version 1, 2001-07-26, ArXiv
- Published version: Physical Review Letters, 88 (12), 127902.
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