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- W2000358938 abstract "We study a continuous-variable dense coding protocol, originally proposed to employ a two-mode squeezed state, using a general two-mode Gaussian state as a quantum channel. We particularly obtain conditions to manifest quantum advantage by beating two well-known single-mode schemes, namely, the squeezed-state scheme (best Gaussian scheme) and the number-state scheme (optimal scheme achieving the Holevo bound). We then extend our study to a multipartite Gaussian state and investigate the monogamy of operational entanglement measured by the communication capacity under the dense coding protocol. We show that this operational entanglement represents a strict monogamy relation, by means of Heisenberg's uncertainty principle among different parties; i.e., the quantum advantage for communication can be possible for only one pair of two-mode systems among many parties." @default.
- W2000358938 created "2016-06-24" @default.
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- W2000358938 date "2014-08-01" @default.
- W2000358938 modified "2023-10-16" @default.
- W2000358938 title "Continuous-variable dense coding via a general Gaussian state: Monogamy relation" @default.
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- W2000358938 doi "https://doi.org/10.1103/physreva.90.022301" @default.
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