Year: 2005
Type: article
Abstract: We consider probabilistic cloning of a state chosen from a mutually nonorthogonal set of pure states, with the help of a party holding supplementary information in the form of pure states. When the number of states is 2, we show that the best efficiency of producing $m$ copies is always achieved by a two-step protocol in which the helping party first attempts to produce $m\ensuremath{-}1$ copies from the supplementary state, and if it fails, then the original state is used to produce $m$ copies. On the other hand, when the number of states exceeds two, the best efficiency is not always achieved by such a protocol. We give examples in which the best efficiency is not achieved even if we allow any amount of one-way classical communication from the helping party.
Source: Physical Review A
Institution: The University of Osaka
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
Award: 一般の送受信装置による量子暗号の無条件安全性の研究
OpenAlex ID: W2963958641