Unambiguous State Discrimination in Quantum Key Distribution Based on Time Coding

2019 ◽  
Vol 86 (5) ◽  
pp. 806-809 ◽  
Author(s):  
M. M. Eskandari ◽  
D. B. Horoshko ◽  
S. Ya. Kilin
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
State Discrimination ◽  
Time Coding ◽  
Unambiguous State Discrimination

Unambiguous State Discrimination Attack on the B92 Protocol of Quantum Key Distribution with Single Photons

2021 ◽  
Vol 24 (3) ◽  
Author(s):  
D. B. Horoshko ◽  
S. Ya. Kilin
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Key Distribution ◽  
Single Photons ◽  
Single Photon Source ◽  
Quantum Cloning ◽  
State Discrimination ◽  
Photon Source ◽  
Unambiguous State Discrimination ◽  
B92 Protocol

We consider an unambiguous state discrimination attack on the B92 protocol of quantum key distribution, realized on the basis of polarization encoding of photons produced by a single-photon source. We calculate the secure key rate and the maximal tolerable loss for various overlaps between two signal states employed in this protocol. We make also a comparison with a physically impossible attack of perfect quantum cloning, and show that the unambiguous state discrimination is much more dangerous for the B92 protocol, than this attack, demonstrating thus, that the security of quantum key distribution is not always based on the no-cloning theorem.

scholarly journals Sequential attacks against differential-phase-shift quantum key distribution with weak coherent states

2007 ◽  
Vol 7 (7) ◽  
pp. 665-688
Author(s):  
M. Curty ◽  
L.L. Zhang ◽  
H.-K. Lo ◽  
N. Lutkenhaus
Keyword(s):  
Phase Shift ◽  
Quantum Key Distribution ◽  
Coherent States ◽  
Key Distribution ◽  
Upper Bounds ◽  
Coherent Light ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
State Discrimination ◽  
Unambiguous State Discrimination

We investigate limitations imposed by sequential attacks on the performance of differential-phase-shift quantum key distribution protocols that use pulsed coherent light. In particular, we analyze two sequential attacks based on unambiguous state discrimination and minimum error discrimination, respectively, of the signal states emitted by the source. Sequential attacks represent a special type of intercept-resend attacks and, therefore, they provide ultimate upper bounds on the maximal distance achievable by quantum key distribution schemes.

Time coding protocols for quantum key distribution

2004 ◽  
Vol 70 (4) ◽  
Author(s):  
Thierry Debuisschert ◽  
William Boucher
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Time Coding

Quantum key distribution with time coding on linearly dependent states

2012 ◽  
Vol 112 (3) ◽  
pp. 335-341 ◽  
Author(s):  
D. B. Horoshko ◽  
D. I. Pustakhod ◽  
S. Ya. Kilin
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Time Coding
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