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Article overview
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Probabilistic cloning with supplementary information | | Koji Azuma
; Junichi Shimamura
; Masato Koashi
; Nobuyuki Imoto
; | | Date: |
27 May 2005 | | Journal: | Phys. Rev. A 72, 032335 (2005) | | Subject: | quant-ph | | 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-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: | arXiv, quant-ph/0505207 | | Services: | Forum | Review | PDF | Favorites | |
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