Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optics Communications

Probabilistically perfect quantum cloning and unambiguous state discrimination

Wen‐Hai Zhang, Dai Jie-lin, Zhuo‐Liang Cao, Ming Yang

Published Jun 5, 2010• 6 citations
Publisher
DOI
10.1016/j.optcom.2010.05.046

Related papers

Unambiguous discrimination of two squeezed states using probabilistic quantum cloning

Devendra Kumar Mishra

Optics Communications•Nov 4, 2011•5 citations

Probabilistic quantum cloning of real states

Wen‐Hai Zhang, Dai Jie-lin, Zhuo‐Liang Cao +1 more

Optics Communications•Jan 8, 2010•9 citations

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

D. B. Horoshko, S. Ya. Kilin

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.

Nonlinear Phenomena in Complex Systems•Oct 12, 2021•0 citations

Probabilistic quantum cloning of a subset of linearly dependent states

Pinshu Rui, Wen Zhang, Yan-Lin Liao +1 more

The European Physical Journal D•Feb 1, 2018•3 citations

Probabilistic cloning of equidistant states

O. Jiménez, Luis Roa, A. Delgado

We study the probabilistic cloning of equidistant states. These states are such that the inner product between them is a complex constant or its conjugate. Thereby, it is possible to study their cloning in a simple way. In particular, we are interested in the behavior of the cloning probability as a function of the phase of the overlap among the involved states. We show that for certain families of equidistant states Duan and Guo's cloning machine leads to cloning probabilities lower than the optimal unambiguous discrimination probability of equidistant states. We propose an alternative cloning machine whose cloning probability is higher than or equal to the optimal unambiguous discrimination probability for any family of equidistant states. Both machines achieve the same probability for equidistant states whose inner product is a positive real number.

Physical Review A•Aug 25, 2010•23 citations

Quantum probabilistically cloning and computation

Ting Gao, Fengli Yan, Zhi‐Xi Wang +1 more

Frontiers of Computer Science in China•Jun 1, 2008•4 citations
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.
We study the probabilistic cloning of equidistant states. These states are such that the inner product between them is a complex constant or its conjugate. Thereby, it is possible to study their cloning in a simple way. In particular, we are interested in the behavior of the cloning probability as a function of the phase of the overlap among the involved states. We show that for certain families of equidistant states Duan and Guo's cloning machine leads to cloning probabilities lower than the optimal unambiguous discrimination probability of equidistant states. We propose an alternative cloning machine whose cloning probability is higher than or equal to the optimal unambiguous discrimination probability for any family of equidistant states. Both machines achieve the same probability for equidistant states whose inner product is a positive real number.