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- W2034795231 abstract "We introduce symmetric extensions of bipartite quantum states as a tool for analyzing protocols that distill secret key from quantum correlations. Whether the correlations are coming from a prepare-and-measure quantum key distribution scheme or from an entanglement-based scheme, the protocol has to produce effective states without a symmetric extension in order to succeed. By formulating the symmetric extension problem as a semidefinite program, we solve the problem for Bell-diagonal states. Applying this result to the six-state and Bennett-Brassard 1984 schemes, we show that for the entangled states that cannot be distilled by current key distillation procedures, the failure can be understood in terms of a failure to break a symmetric extension." @default.
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- W2034795231 date "2009-04-22" @default.
- W2034795231 modified "2023-10-02" @default.
- W2034795231 title "Symmetric extension in two-way quantum key distribution" @default.
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- W2034795231 doi "https://doi.org/10.1103/physreva.79.042329" @default.
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