| 1. |
- Bourennane, M., et al.
(författare)
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Quantum key distribution using multilevel encoding : security analysis
- 2002
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Ingår i: Journal of Physics A. - : IOP Publishing. - 0305-4470 .- 1361-6447. ; 35:47, s. 10065-10076
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Tidskriftsartikel (refereegranskat)abstract
- We propose an extension of quantum key distribution based on encoding the key into quNits, i.e. quantum states in an N-dimensional Hilbert space. We,estimate both the mutual information between the legitimate parties and the eavesdropper, and the error rate, as a function of the dimension of the Hilbert space. We derive the information gained by an eavesdropper using optimal incoherent attacks and an upper bound on the legitimate party error rate that ensures unconditional security when the eavesdropper uses finite coherent eavesdropping attacks. We also consider realistic systems where we assume that the detector dark count probability is not negligible.
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| 2. |
- Cerf, N. J., et al.
(författare)
-
Security of quantum key distribution using d-level systems
- 2002
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 88:12
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Tidskriftsartikel (refereegranskat)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 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.
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